Updated on 2022/12/01

写真a

 
KAJIMOTO Takuya
 
Organization
Sado Island Center for Ecological Sustainability . Professor
Title
Professor
External link

Degree

  • 農学博士 ( 1991.3   名古屋大学 )

  • 農学修士 ( 1986.3 )

Research Interests

  • 熱帯林

  • Tree growth analysis

  • Tropical forest

  • Forest ecology

  • シベリア

  • snowfall

  • cesium

  • silviculture

  • 亜高山帯

  • biomass

  • Carbon cycling

  • 炭素循環

  • 森林生態

  • Siberian forest ecosystem

  • Pinus pumila

Research Areas

  • Life Science / Forest science  / Forest ecology

Research History (researchmap)

  • 森林総合研究所 東北支所長

    2017.4 - 2021.3

      More details

  • 森林総合研究所 植物生態研究領域長

    2012.4 - 2017.3

      More details

  • 森林総合研究所植物生態研究領域 チーム長・室長

    2008.4 - 2010.3

      More details

  • 森林総合研究所九州支所 チーム長

    2004.4 - 2008.3

      More details

  • 森林総合研究所東北支所 研究員

    1993.10 - 2004.3

      More details

  • 旧科学技術庁特別研究員(森林総合研究所勤務)

    1991.9 - 1993.8

      More details

▶ display all

Research History

  • Niigata University   Professor

    2021.4

Education

  • 名古屋大学大学院農学研究科

    1984 - 1989

      More details

  • Nagoya University   School of Agricultural Sciences

    1979 - 1983

      More details

Professional Memberships

Committee Memberships

  • 日本森林学会   理事  

    2018   

      More details

    Committee type:Academic society

    researchmap

  • 東北森林科学会   理事  

    2017 - 2021   

      More details

    Committee type:Academic society

    researchmap

  •   Trees- Structure and Function 編集委員  

    2013   

      More details

    Committee type:Academic society

    researchmap

  •   Journal of Forest Research 編集委員  

    2013 - 2020   

      More details

    Committee type:Academic society

    researchmap

  •   日本森林学会誌 編集委員  

    2004 - 2008   

      More details

    Committee type:Academic society

    researchmap

  •   Ecological Research 編集委員  

    2003 - 2007   

      More details

    Committee type:Academic society

    researchmap

▶ display all

 

Papers

  • Application of a u-w method for the detection of boreal forest response to environmental changes in Canada

    Amin Niazai, Akira Osawa, Nahoko Kurachi, Tomiyasu Miyaura, Takuya Kajimoto, Juha M. Metsaranta, Masako Dannoura, Naoki Okada

    Journal of Forest Research   2021

     More details

    Publishing type:Research paper (scientific journal)  

    To better understand the long-term response of boreal forests to increasing environmental changes, we applied the u-w method to detect growth changes triggered by environmental factors. Three species (Picea mariana, Picea glauca, and Populus tremuloides) of various sizes and ages were sampled in a boreal forest in northern Canada. Several stem disks were collected from the base to the crown of seven or eight trees in each of ten plots and ring width was measured to estimate the annual volume growth of each tree. Growth shifts, or changes in the phase of volume growth, were observed in every tree, and some shift years were common to the plots and species, suggesting the same environmental impact on trees. More frequent growth shifts were observed in the smallest trees in the black spruce plots, but showed no common patterns among the trees of different ages/sizes and species. Common growth shifts across species and plots were observed after severe drought years associated with fire incidences. We concluded that the u-w method is useful for detecting multi-year climate impacts on tree growth.

    DOI: 10.1080/13416979.2021.1901836

    Scopus

    researchmap

  • Vertical distribution of radiocesium concentrations among crown positions and year-to-year variation in four major tree species after the Fukushima Daiichi Nuclear Power Plant accident

    Tanaka Kenzo, Satoshi Saito, Masatake G. Araki, Takuya Kajimoto

    Journal of Environmental Radioactivity   225   2020.12

     More details

    Publishing type:Research paper (scientific journal)  

    To evaluate the distribution of radiocesium ( Cs) among crown positions in trees after the Fukushima Daiichi Nuclear Power Plant accident, we collected foliage and branch samples from different crown positions of four major tree species (Chamaecyparis obtusa, Cryptomeria japonica, Pinus densiflora, and Quercus serrata) from 2011 to 2019 in northeast Japan. We divided the samples into current-year and more than 1-year-old groups (called old foliage and old branches), which sometimes included directly contaminated parts. The Cs activity concentration in dry foliage and branches was measured using a germanium semiconductor detector. There were complex differences in the relative Cs activity concentration among species and organ types (i.e., foliage and branches) among crown positions. The relative Cs activity concentration in current-year foliage was higher in the upper crowns of C. obtusa, but higher in lower crown positions in C. japonica. No differences among crown positions were observed in P. densiflora and Q. serrata. In current-year branches, the relative Cs concentration in Q. serrata was similar among crown positions but higher in the upper crown in P. densiflora. The concentrations in old foliage and old branches in all species tended to be higher in the lower crown. The factors causing these interspecific and organ type differences among crown positions may be related to the organ turnover rate, dilution effect due to different growth rates, and potassium distribution within the crown. No year-to-year variation was observed in most foliage and branches in all species, except for current-year branches of Q. serrata, old foliage in C. japonica and P. densiflora, and old branches in P. densiflora. Our long-term data on the interspecific and inter-organ patterns of contamination, focusing on variation among crown positions and year-to-year trends, might help to improve the estimation of Cs deposition and dynamics in polluted forest ecosystems. 137 137 137 137 137 137

    DOI: 10.1016/j.jenvrad.2020.106447

    Scopus

    PubMed

    researchmap

  • Seasonal changes in radiocesium and potassium concentrations in current-year shoots of saplings of three tree species in Fukushima, Japan

    Tanaka Kenzo, Satoshi Saito, Satoru Miura, Takuya Kajimoto, Natsuko I. Kobayashi, Keitaro Tanoi

    Journal of Environmental Radioactivity   223-224   2020.11

     More details

    Publishing type:Research paper (scientific journal)  

    We studied seasonal changes in radiocesium ( Cs) activity and potassium concentrations in current-year leaves and branches of Pinus densiflora (naturally regenerated saplings), Cryptomeria japonica (planted saplings) and Quercus serrata (planted saplings and coppice shoots) in Fukushima, Japan. We collected current-year shoots from 10 individuals of each species over two growing seasons at intervals of 1–4 months, between June 2016 and December 2017. For the deciduous species Q. serrata, we also collected dead leaves that remained attached to branches in December to investigate reabsorption of Cs. All collected shoots were divided into leaves and branches, oven-dried, and ground; dry weights of each sample were recorded. Cs activity concentrations were measured using a germanium semiconductor detector. Potassium concentrations were quantified using inductively coupled plasma optical emission spectrometry (ICP-OES). Increases in dry weight were observed in both leaves and branches between May/June and August; growth then slowed considerably and virtually ceased after October. Clear seasonal changes in Cs activity concentrations were observed in both 2016 and 2017, regardless of tree species. Concentrations were higher in young leaves and branches during May and June, then decreased and changed relatively little from August to winter. Reduced Cs activity concentrations in dead leaves of Q. serrata were observed only in December 2017 (approximately 15% lower than in October). This reduction may indicate reabsorption of Cs in leaves prior to shedding. The changes in potassium concentrations were similar to those in Cs in both years. Potassium concentrations were higher in young leaves than in mature leaf and branch samples collected later in the year. A reduction of about 50% in the potassium concentrations in dead leaves of Q. serrata was also observed in December. A positive relationship between Cs and potassium concentrations in leaves and branches was observed in all species, except for planted Q. serrata. This relationship may indicate that Cs moves in tree shoots with potassium. Leaf and branch weight correlated negatively with Cs and potassium concentrations. Reduced concentrations may indicate dilution of these elements as a result of biomass increases over the growing season. Our results imply that irrespective of species, Cs exhibits seasonal variations resulting from dilution; these variations correspond with trends in potassium, with higher levels in young organs and decreased levels in older organs. 137 137 137 137 137 137 137 137 137 137 137

    DOI: 10.1016/j.jenvrad.2020.106409

    Scopus

    PubMed

    researchmap

  • Regeneration process biased toward under-crown Sasa-lacking habitat of sparse Abies mariesii forest with dense undergrowth of dwarf bamboo on a snowy mountain, northern Japan

    Hisashi Sugita, Yusuke Nishio, Toshihiko Takahashi, Takuya Kajimoto, Yu Ichihara, Takashi Kunisaki

    JOURNAL OF FOREST RESEARCH   24 ( 3 )   178 - 186   2019.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    In sparse Abies mariesii forests with an undergrowth of dense dwarf bamboo (Sasa kurilensis) in subalpine areas of snowy mountains in northern Honshu, Japan, A. mariesii saplings are more abundant in Sasa-lacking patches under the crowns of A. mariesii canopy trees than in outside-crown areas densely covered with Sasa. To discuss the mechanism of such under-crown-biased regeneration, we examined the underlayer light conditions, population structure, seed dispersal, and the survival and growth of seedlings and saplings in four habitats with different canopy and undergrowth conditions, i.e. under-crown lacking Sasa (UCLS), under-crown with Sasa (UCWS), outside-crown lacking Sasa (OCLS), and outside-crown with Sasa (OCWS). Sapling banks were observed in all four habitats. The light condition in the UCLS was almost equivalent to or inferior to that in the OCWS. The survivorship of seedlings and saplings did not differ among the habitats. The increment of sapling trunk length in the UCLS was equivalent to that in the OCWS. These results indicate that the presence of A. mariesii canopy trees did not significantly improve the light condition, survival, or growth of A. mariesii seedlings and saplings. Instead, abundant seed supply under the crowns contributed to higher population densities and under-crown-biased regeneration. The existence of a sapling bank in the OCWS suggests the possibility of successful A. mariesii regeneration in this habitat even without the simultaneous death of Sasa. The dynamics of sparse A. mariesii forest may progress through shifting of the canopy and undergrowth conditions (e.g. UCLS to OCWS via OCLS).

    DOI: 10.1080/13416979.2019.1590966

    Web of Science

    researchmap

  • Approach to reduction of reforestation cost:: Focusing on low density planting and weeding activity

    Komaki Takaaki, Kajimoto Takuya, Yagihashi Tsutomu

    Tohoku Journal of Forest Science   24 ( 1 )   21 - 24   2019

     More details

    Language:Japanese   Publisher:The Tohoku Society of Forest Science  

    DOI: 10.18982/tjfs.24.1_21

    CiNii Article

    CiNii Books

    researchmap

  • Recovery of above-ground tree biomass after moderate selective logging in a central Amazonian forest Reviewed

    Tatsuya Otani, Adriano J. N. Lima, Rempei Suwa, Marcio R. M. Amaral, Shinta Ohashi, Alberto C. M. Pinto, Joaquim Dos Santos, Takuya Kajimoto, Niro Higuchi, Moriyoshi Ishizuka

    IFOREST-BIOGEOSCIENCES AND FORESTRY   11 ( 3 )   352 - 359   2018.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SISEF-SOC ITALIANA SELVICOLTURA ECOL FORESTALE  

    We examined the recovery and dynamics of living tree above-ground biomass (AGB) after selective logging in an Amazonian terra firme forest managed by a private company. The forest consisted of 24 blocks (including one set aside for conservation) selectively logged in different years on a managed schedule. Trees >= 10 cm in diameter at breast height (dbh) were surveyed in 2006 in 192 0.25-ha plots, in 2010 in 119 plots, and in 2012-2013 in 54 plots. A logistic growth model factoring in logging dynamics and mean AGB of a block in these years was established. Referencing the mean AGB of the unlogged forest, the model indicated that the logged forest would take on average 14 years to regain its preharvest AGB after selective logging at 1.9 trees ha(-1) (dbh > 50 cm). In 2010 and 2012-2013, the AGB increased significantly for small and large trees (10-20 cm and > 60 cm dbh, respectively) in the logged forest. In contrast, it decreased significantly for medium-sized trees (30-50 cm dbh) in the unlogged forest. Comparisons with the previous studies mainly conducted in the other regions of Amazon suggested that the estimated AGB recovery period with moderate logging intensity was almost appropriate and likely acceptable to forest managers.

    DOI: 10.3832/ifor2534-011

    Web of Science

    Scopus

    researchmap

  • Vertical and seasonal variations in temperature responses of leaf respiration in a Chamaecyparis obtusa canopy Reviewed

    Masatake G. Araki, Koichiro Gyokusen, Takuya Kajimoto

    TREE PHYSIOLOGY   37 ( 10 )   1269 - 1284   2017.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS  

    Leaf respiration (R) is a major component of carbon balance in forest ecosystems. Clarifying the variability of leaf R within a canopy is essential for predicting the impact of global warming on forest productivity and the potential future function of the forest ecosystem as a carbon sink. We examined vertical and seasonal variations in short-term temperature responses of leaf R as well as environmental factors (light and mean air temperature) and physiological factors [leaf nitrogen (N), leaf mass per area (LMA), and shoot growth] in the canopy of a 10-year-old stand of hinoki cypress [Chamaecyparis obtusa (Sieb. et Zucc.) Endl.] in Kyushu, Japan. Leaf respiration rate adjusted to 20 degrees C (R-20) exhibited evident vertical gradients in each season and was correlated with light, LMA and leaf N. In contrast, the temperature sensitivity of leaf R (Q(10)) did not vary vertically throughout the seasons. Seasonally, Q(10) was higher in winter than in summer and was strongly negatively correlated to mean air temperature. A negative correlation of R-20 with mean air temperature was also observed for each of the three canopy layers. These results clearly indicate that leaf R was able to adjust to seasonal changes in ambient temperature under field conditions and down-regulate during warmer periods. We also found that the degree of thermal acclimation did not vary with canopy position. Overall, our results suggest that vertical and seasonal variations in temperature responses of leaf R within a hinoki cypress canopy could be predicted by relatively simple parameters (light and temperature). There was an exception of extremely high R-20 values in April that may have been due to the onset of shoot growth in spring. Understanding thermal acclimation and variations in leaf R within forest canopies will improve global terrestrial carbon cycle models.

    DOI: 10.1093/treephys/tpx012

    Web of Science

    researchmap

  • Temporal changes in the radiocesium distribution in forests over the five years after the Fukushima Daiichi Nuclear Power Plant accident Reviewed

    Naohiro Imamura, Masabumi Komatsu, Shinta Ohashi, Shoji Hashimoto, Takuya Kajimoto, Shinji Kaneko, Tsutomu Takano

    SCIENTIFIC REPORTS   7 ( 1 )   8179   2017.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    To elucidate the temporal changes in the radiocesium distribution in forests contaminated by the Fukushima Daiichi Nuclear Power Plant accident, we monitored the Cs-137 concentration and inventory within forests from 2011 to 2015 across nine plots containing variable tree species and different contamination levels. The Cs-137 concentrations in needles and branches decreased exponentially at all coniferous plots, with effective ecological half-lives of 0.45-1.55 yr for needles and 0.83-1.69 yr for branches. By contrast, the Cs-137 concentration in deciduous konara oak leaves did not change over the five years. The concentration of Cs-137 in oak wood increased by 37-75%, whereas that in Japanese red pine decreased by 63% over the five years. In Japanese cedar and hinoki cypress, the Cs-137 concentration in wood showed an increasing trend in half of the plots. The changes in Cs-137 in the organic and mineral soil layers were not strongly related to the tree species or contamination level. Our multi-site, multi-species monitoring results revealed that the pattern of temporal changes in radiocesium in the 9 forest plots was similar overall; however, changes in Cs-137 in needles/leaves and wood differed among tree species.

    DOI: 10.1038/s41598-017-08261-x

    Web of Science

    researchmap

  • Leaf and branch radiocesium concentration in planted and naturally regenerated three tree species after the accident of Fukushima Daiichi Nuclear Power Plant Reviewed

    TANAKA Kenzo

    Kanto Journal of Forest Research   68 ( 1 )   9 - 12   2017.3

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    We measured leaf and branch radiocesium (137Cs) concentration in planted and naturally regenerated tree species after the accident of Fukushima Daiichi Nuclear Power Plant of TEPCO. We collected current year shoots of planted seedlings of Cryptomeria japonica (Cj) and Quercus serrata (Qs), naturally regenerated seedlings of Pinus densiflora (Pd), and sprouted coppice of Qs at June and July in 2016, respectively in Fukushima, Japan. Concentrations of 137Cs were measured for grinded samples by using germanium semiconductor detector. The highest 137Cs concentration in June observed in current leaves of Cj, whereas Qs leaves showed the lowest values. Leaf 137Cs concentration in the studied species reduced with leaf aging. Negative relation between leaf 137Cs and indicators of leaf maturation such as leaf mass per area and chlorophyll content (SPAD value) in Qs also support this pattern. In contrast, relationship between leaf potassium ion and 137Cs concentrations in Qs leaves was not significant. Those results suggested that leaf 137Cs concentrations decrease with increasing leaf maturation in those tree species.

    researchmap

  • The Performance of Containerized Tree Seedlings after Outplantings Evaluated from Multi-site Data Set Reviewed

    Kabeya Daisuke, Utsugi Hajime, Kita Kazuto, Ogura Akira, Watanabe Naofumi, Fujimoto Kohei, Yamazaki Makoto, Yashiro Tadayuki, Kajimoto Takuya, Tanaka Hiroshi

    Journal of the Japanese Forest Society   98 ( 5 )   214 - 222   2016.10

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    <p>Containerized tree seedlings are expected to exhibit high survivorship and good growth after outplanting; however, a unified consensus on the performance of containerized seedlings in Japan remains undetermined. To understand the universal properties of the performances of containerized seedlings after outplanting, the survival ratio and height and diameter growth rate of two stock types (containerized seedlings and bare-root seedlings) were estimated from 39 experiment sites covering five prefectures and five species and compared between stock types. The result of parameter estimation using hierarchal Bayesian models revealed that the median survival ratio of containerized seedlings across all species was 0.96, which was not different from that of bare-root seedlings (0.97). The estimated height and diameter growth rates were also similar between stock types. The sturdiness quotient (SQ, the ratio of height and diameter) was higher in containerized seedlings than in bare-root seedlings of all species immediately after outplanting. However, the difference in SQ between stock types diminished 1 year after outplanting. These results suggest that containerized tree seedlings generally show performances equivalent to those of bare-root seedlings after outplanting. Therefore, other properties of containerized seedlings, such as ease of cultivation and low-labor planting present more attractive advantages than those of good performance after outplanting.</p>

    DOI: 10.4005/jjfs.98.214

    CiNii Article

    CiNii Books

    researchmap

  • Overview of forest carbon stock study in Amazon State, Brazil Reviewed

    Higuchi N, Suwa R, Higuchi FG, Lima AJN, Santos J, Noguchi H, Kajimoto T, Ishizuka M

    Nagy L et al. (eds.), Interactions between biosphere, atmosphere, and human land use in the Amazon Basin. Ecological Studies 227   171 - 187   2016.10

     More details

  • Characteristics of initial deposition and behavior of radiocesium in forest ecosystems of different locations and species affected by the Fukushima Daiichi Nuclear Power Plant accident Reviewed

    Masabumi Komatsu, Shinji Kaneko, Shinta Ohashi, Katsushi Kuroda, Tetsuya Sano, Shigeto Ikeda, Satoshi Saito, Yoshiyuki Kiyono, Mario Tonosaki, Satoru Miura, Akio Akama, Takuya Kajimoto, Masamichi Takahashi

    JOURNAL OF ENVIRONMENTAL RADIOACTIVITY   161   2 - 10   2016.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    After the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, information about stand-level spatial patterns of radiocesium initially deposited in the surrounding forests was essential for predicting the future dynamics of radiocesium and suggesting a management plan for contaminated forests. In the first summer (approximately 6 months after the accident), we separately estimated the amounts of radio cesium (Cs-134 and Cs-137; Bq m(-2)) in the major components (trees, organic layers, and soils) in forests of three sites with different contamination levels. For a Japanese cedar (Cryptomeria japonica) forest studied at each of the three sites, the radiocesium concentration greatly differed among the components, with the needle and organic layer having the highest concentrations. For these cedar forests, the proportion of the Cs-137 stock in the aboveground tree biomass varied from 22% to 44% of the total Cs-137 stock; it was 44% in highly contaminated sites (7.0 x 10(5) Bq m(-2)) but reduced to 22% in less contaminated sites (1.1 x 104 Bq m(-2)). In the intermediate contaminated site (5.0-5.8 x 10(4) Bq m(-2)), 34% of radiocesium was observed in the aboveground tree biomass of the Japanese cedar stand. However, this proportion was considerably smaller (18-19%) in the nearby mixed forests of the Japanese red pine (Pinus densiflora) and deciduous broad-leaved trees. Non-negligible amounts of Cs-134 and Cs-137 were detected in both the sapwood and heartwood of all the studied tree species. This finding suggested that the uptake or translocation of radiocesium had already started within 6 months after the accident. The belowground compartments were mostly present in the organic layer and the uppermost (0-5 cm deep) mineral soil layer at all the study sites. We discussed the initial transfer process of radiocesium deposited in the forest and inferred that the type of initial deposition (i.e., dry versus wet radiocesium deposition), the amount of rainfall after the accident, and the leaf biomass by the tree species may influence differences in the spatial pattern of radiocesium by study plots. The results of the present study and further studies of the spatial pattern of radiocesium are important for modeling future radiocesium distribution in contaminated forest ecosystems. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jenvrad.2015.09.016

    Web of Science

    researchmap

  • Impact of leaf removal on initial survival and growth of container-grown and bare-root seedlings of Hinoki cypress (Chamaecyparis obtusa) Reviewed

    Naoko Yamashita, Shiro Okuda, Rempei Suwa, Thomas Ting Lei, Hiroyuki Tobita, Hajime Utsugi, Takuya Kajimoto

    FOREST ECOLOGY AND MANAGEMENT   370   76 - 82   2016.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    As a part of improving forest management practices, we tested the idea that partial defoliation of container-grown and bare-root Hinoki cypress (Chamaecyparis obtusa) seedlings prior to outplanting can reduce transplant shock and enhance seedling survival during their first growing season after transplanting. For container-grown seedlings, the remaining leaves of defoliated seedlings showed photosynthetic capacity (Amax) about 1.5 times higher than the non-defoliated control in the first 3 weeks. For defoliated bare-root seedlings, Amax ranged 3.3-4.8 times higher than non-defoliated control in the first 4 weeks after transplanting. Thereafter, Amax of defoliated seedlings of both types began to decrease slowly. Amax of newly emerged leaves after transplanting was significantly higher than that of existing leaves for container-grown seedlings but not bare-root seedlings. For container-grown seedlings, both defoliated and non-defoliated plants showed high survival rate (&gt;90%) and there were no significant differences among levels of defoliation. For bare-root seedlings, non-defoliated control showed highest mortality (30%) by the end of the growing season but seedlings that were 25%, 50%, 75% defoliated all suffered little mortality. In terms of initial growth, there was no significant difference between defoliated and non-defoliated control in container seedlings suggesting that defoliation treatment had no effect on reducing their growth. In comparison, bare-root seedlings showed marginally but significantly greater height growth in defoliated plants, suggesting that non-defoliated seedlings suffered greater transplant shock and reducing the amount of leaves may contribute to minimize water stress and mortality. Therefore, we found that for bare-root seedlings, partial defoliation can effectively reduce transplant shock resulting in high survivorship and growth performance; the lack of defoliation response in container-grown seedlings would suggest that defoliation is unnecessary for improving their transplant success. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.foreco.2016.03.054

    Web of Science

    researchmap

  • Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest Reviewed

    Shinta Ohashi, Flavia M. Durgante, Akira Kagawa, Takuya Kajimoto, Susan E. Trumbore, Xiaomei Xu, Moriyoshi Ishizuka, Niro Higuchi

    OECOLOGIA   180 ( 3 )   685 - 696   2016.3

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    In Amazonian non-flooded forests with a moderate dry season, many trees do not form anatomically definite annual rings. Alternative indicators of annual rings, such as the oxygen (delta O-18(wc)) and carbon stable isotope ratios of wood cellulose (delta C-13(wc)), have been proposed; however, their applicability in Amazonian forests remains unclear. We examined seasonal variations in the delta O-18(wc) and delta C-13(wc) of three common species (Eschweilera coriacea, Iryanthera coriacea, and Protium hebetatum) in Manaus, Brazil (Central Amazon). E. coriacea was also sampled in two other regions to determine the synchronicity of the isotopic signals among different regions. The annual cyclicity of delta O-18(wc) variation was cross-checked by C-14 dating. The delta O-18(wc) showed distinct seasonal variations that matched the amplitude observed in the delta O-18 of precipitation, whereas seasonal delta C-13(wc) variations were less distinct in most cases. The delta O-18(wc) variation patterns were similar within and between some individual trees in Manaus. However, the delta O-18(wc) patterns of E. coriacea differed by region. The ages of some samples estimated from the delta O-18(wc) cycles were offset from the ages estimated by C-14 dating. In the case of E. coriacea, this phenomenon suggested that missing or wedging rings may occur frequently even in well-grown individuals. Successful cross-dating may be facilitated by establishing delta O-18(wc) master chronologies at both seasonal and inter-annual scales for tree species with distinct annual rings in each region.

    DOI: 10.1007/s00442-015-3509-x

    Web of Science

    researchmap

  • Changes in forest structure and biomass over ten years in a lowland Amazonian forest Reviewed

    Suwa R, Silva F, Lima AJN, Pinto ACM, Santos J, Kajimoto T, Ishizuka M, Higuchi N

    JARQ   50   379 - 386   2016

  • P8-1-6 ヒノキ植栽木の放射性セシウム吸収抑制に対するカリウム施肥の効果(ポスター,8-1 環境保全,2016年度佐賀大会)

    平井 敬三, 小松 雅史, 長倉 淳子, 野口 享太郎, 大橋 伸太, 川崎 達郎, 山田 毅, 今村 直広, 矢崎 健一, 斎藤 哲, 梶本 卓也, 赤間 亮夫, 池田 重人, 高橋 正通, 竹中 篤史, 田坂 隆治

    日本土壌肥料学会講演要旨集   62   157 - 157   2016

     More details

    Language:Japanese   Publisher:一般社団法人 日本土壌肥料学会  

    DOI: 10.20710/dohikouen.62.0_157_2

    CiNii Article

    researchmap

  • Temporal changes of radiocesium concentrations and depositions at forests through five years after the FDNPP accident

    Imamura Naohiro, Kaneko Shinji, Kajimoto Takuya, Suzuki Youki, Kobayashi Masahiro, Saito Satoshi, Kawasaki Tatsuro, Ohashi Shinta, Komatsu Masabumi, Takano Tsutomu, Ikeda Shigeto, Akama Akio, Takahashi Masamichi

    The Japanese Forest Society Congress   127   801 - 801   2016

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_801

    CiNii Article

    researchmap

  • Recovery of biomass forty-three years after a typhoon disturbance in a subalpine wave-regenerated forest

    Iwamoto Kojiro, Ugawa Shin, Araki Masatake G, Kabeya Daisuke, Ishizuka Moriyoshi, Kajimoto Takuya

    The Japanese Forest Society Congress   127   543 - 543   2016

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_543

    CiNii Article

    researchmap

  • The effect of Potassium fertilization on radiocesium levels of Japanese cypress seedlings

    Komatsu Masabumi, Hirai Keizo, Akama Akio, Noguchi Kyotaro, Nagakura Junko, Yamada Tsuyoshi, Ohashi Shinta, Saito Satoshi, Kawasaki Tatsuro, Yazaki Kenichi, Ikeda Shigeto, Imamura Naohiro, Kajimoto Takuya, Takahashi Masamichi, Miyazawa Kazumasa, Itoh Naoshi, Yamaguchi Yasuhiro, Takizawa Masaru, Aoki Isamu

    The Japanese Forest Society Congress   127   813 - 813   2016

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_813

    CiNii Article

    researchmap

  • Scaling of canopy respiration from leaf-level measurements in a young hinoki cypress stand

    Araki Masatake, Gyokusen Koichiro, Kajimoto Takuya

    The Japanese Forest Society Congress   127   308 - 308   2016

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_308

    CiNii Article

    researchmap

  • A new 500-m resolution map of canopy height for Amazon forest using spaceborne LiDAR and cloud-free MODIS imagery Reviewed

    Yoshito Sawada, Rempei Suwa, Keiji Jindo, Takahiro Endo, Kazuo Oki, Haruo Sawada, Egidio Arai, Yosio Edemir Shimabukuro, Carlos Henrique Souza Celes, Moacir Alberto Assis Campos, Francisco Gasparetto Higuchi, Adriano Jose Nogueira Lima, Niro Higuchi, Takuya Kajimoto, Moriyoshi Ishizuka

    INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION   43   92 - 101   2015.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    In the present study, we aimed to map canopy heights in the Brazilian Amazon mainly on the basis of spacebome LiDAR and cloud-free MODIS imagery with a new method (the Self-Organizing Relationships method) for spatial modeling of the LiDAR footprint. To evaluate the general versatility, we compared the created canopy height map with two different canopy height estimates on the basis of our original field study plots (799 plots located in eight study sites) and a previously developed canopy height map. The compared canopy height estimates were obtained by: (1) a stem diameter at breast height (D)- tree height (H) relationship specific to each site on the basis of our original field study, (2) a previously developed D-H model involving environmental and structural factors as explanatory variables (Feldpausch et al., 2011), and (3) a previously developed canopy height map derived from the spacebome LiDAR data with different spatial modeling method and explanatory variables (Simard et al., 2011). As a result, our canopy height map successfully detected a spatial distribution pattern in canopy height estimates based on our original field study data (r=0.845, p = 8.31 x 10(-3)) though our canopy height map showed a poor correlation (r= 0.563, p =0.146) with the canopy height estimate based on a previously developed model by Feldpausch et al. (2011). We also confirmed that the created canopy height map showed a similar pattern with the previously developed canopy height map by Simard et al. (2011). It was concluded that the use of the spaceborne LiDAR data provides a sufficient accuracy in estimating the canopy height at regional scale. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jag.2015.04.003

    Web of Science

    researchmap

  • 福島原発事故で汚染された森林の樹木地上部における放射性セシウムの蓄積量

    KAJIMOTO TAKUYA, SAITO SATOSHI, KAWASAKI TATSURO, KABEYA DAISUKE, YAZAKI KEN'ICHI, OTA TAKAYUKI, KOMATSU MASAFUMI, TABUCHI RYUICHI, MATSUMOTO YOSUKE, TANAKA KENZO, ABE MAKOTO, SUGITA HISASHI, UTSUGI HAJIME, SAKAI TAKESHI, TOBITA HIROYUKI, ITO HIROKI, OHASHI SHINTA, TAKANO TSUTOMU, KANEKO SHINJI, AKAMA AKIO, TANAKA HIROSHI, KIYONO YOSHIYUKI, TAKAHASHI MASAMICHI

    関東森林研究   66 ( 2 )   159 - 162   2015.7

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Effect of stem radial growth on seasonal and spatial variations in stem CO2 efflux of Chamaecyparis obtusa Reviewed

    Masatake G. Araki, Takuya Kajimoto, Qingmin Han, Tatsuro Kawasaki, Hajime Utsugi, Koichiro Gyokusen, Yukihiro Chiba

    TREES-STRUCTURE AND FUNCTION   29 ( 2 )   499 - 514   2015.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Key message Besides stem temperature, seasonality and vertical gradient in stem diameter growth strongly affect both seasonal and vertical variations in stem CO2 efflux.
    Abstract Stem CO2 efflux (E-s) is known to vary seasonally and vertically along tree stems. We measured E-s at various heights in a 50-year-old hinoki cypress [Chamaecyparis obtusa (Sieb. et Zucc) Endl.] stand over 2 consecutive years in Central Japan. Effects of stem temperature (T-s), daily stem diameter increment (D-i), and difference in vapor pressure deficit between nighttime and daytime (VPDdiff) on seasonal variation in daily E-s were examined by a generalized linear model (GLM). Daily E-s exhibited a substantial seasonal variation, which was mostly affected by T-s and D-i. Any effect of VPDdiff, which was assumed to be an index of daily sap flow rate, was not detected. The GLM prediction of daily E-s from the combination of T-s and D-i showed good agreement with the observed seasonal trend in daily E-s. These results suggest that, in addition to stem temperature as the important environmental factor, stem radial growth is a significant phenological factor influencing seasonal variation in E-s. Additionally, the intercept of GLM, which indicates the basal daily efflux that is independent of T-s and D-i, was closely related to the annual diameter increment. Furthermore, a strong relationship was found between annual E-s and annual diameter increment. These findings suggest that variation in stem diameter growth along stems is considerably responsible for the observed vertical variation in E-s. Therefore, stem radial growth can affect both seasonal and spatial variations in stem CO2 efflux.

    DOI: 10.1007/s00468-014-1127-6

    Web of Science

    J-GLOBAL

    researchmap

  • Developing an effective glyphosate application technique to control Bischofia javanica Blume, an invasive alien tree species in the Ogasawara Islands Reviewed

    Takeharu Itou, Kayo Hayama, Atsushi Sakai, Hiroyuki Tanouchi, Shiro Okuda, Hiromichi Kushima, Takuya Kajimoto

    JOURNAL OF FOREST RESEARCH   20 ( 1 )   248 - 253   2015.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER JAPAN KK  

    Bischofia javanica is a non-native tree species in Japan's Ogasawara Islands, where it threatens native tree species due to its rapid propagation and growth. An effective method is needed to limit the expansion of B. javanica populations and to conserve the natural forest ecosystem of the islands. For this purpose, we examined the effectiveness of a new application technique for the herbicide glyphosate on B. javanica. In this method, glyphosate solution is directly injected into holes drilled in the stem, and each hole is then plugged with a cork stopper to prevent loss of the solution, namely the drill-and-plug method. We also developed an allometric regression model linking stem diameter with total aboveground biomass (AGB) to estimate the necessary herbicide dosage. Our results suggest that between 0.1 and 0.5 g kg(-1) (active ingredient per unit AGB) is required to control most B. javanica trees. Verification of the drill-and-plug method using the minimum dosage (0.1 g kg(-1)) showed that most of the herbicide-treated trees were killed. These results suggest that the drill-and-plug method can help control the B. javanica invasion of the Ogasawara Islands.

    DOI: 10.1007/s10310-014-0457-y

    Web of Science

    J-GLOBAL

    researchmap

  • Dynamics of radiocesium in forest ecosystems affected by the Fukushima daiichi nuclear power plant accident: Species-related transfer processes of radiocesium from tree crowns to ground floor during the first two years Reviewed

    Takuya Kajimoto, Satoshi Saito, Tatsuro Kawasaki, Daisuke Kabeya, Kenichi Yazaki, Hiroshi Tanaka, Takayuki Ota, Yosuke Matsumoto, Ryuichi Tabuchi, Yoshiyuki Kiyono, Tsutomu Takano, Katsushi Kuroda, Takeshi Fujiwara, Youki Suzuki, Masafumi Komatsu, Shinta Ohashi, Shinki Kaneko, Akio Akama, Masamichi Takahashi

    Nihon Ringakkai Shi/Journal of the Japanese Forestry Society   97 ( 1 )   33 - 43   2015.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE JAPANESE FORESTRY SOCIETY  

    We examined the dynamics of radiocesium in the forest ecosystems which were contaminated by the Fukushima Daiichi Nuclear Power Plant Accident. Field measurement and sampling were conducted in eight stands; plantations of Japanese cedar (Cryptomeria japonica, n=4), Hinoki cypress (Chamaecyparis obtusa, n=2), Japanese red pine (Pinus densiflora, n=1), and deciduous broad-leaved forest dominated by oak (Quercus serrata, n=1). In each stand, &lt;sup&gt;137&lt;/sup&gt;Cs deposition in trees was estimated separately for each aboveground component (leaves, branches, and stem) using the data of specific &lt;sup&gt;137&lt;/sup&gt;Cs activities and biomass of these components obtained during 2011-2013. We found that tree- &lt;sup&gt;137&lt;/sup&gt;Cs decreased substantially during the period for all forest types. In 2013 however, the &lt;sup&gt;137&lt;/sup&gt;Cs ratio of trees to stand total (i.e., trees plus litter and soil) differed by forest type: Japanese cedar (6-24%) and Hinoki cypress (10-12%) were higher than pine (2%) and deciduous broad-leaved (3%) forests. The results suggested that the early 2-year transfer process of radiocesium from the tree crown to the ground differed depending on the amount of initial &lt;sup&gt;137&lt;/sup&gt;Cs deposition and differences in leaf longevity and biomass of dominant species.

    DOI: 10.4005/jjfs.97.33

    Scopus

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • Allometric equations for estimating biomass of euterpe precatoria, the most abundant palm species in the Amazon

    Fernando Da Silva, Rempei Suwa, Takuya Kajimoto, Moriyoshi Ishizuka, Niro Higuchi, Norbert Kunert

    Forests   6 ( 2 )   450 - 463   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Allometric models to estimate biomass components such as stem mass M , foliage mass Ml, root mass M and aboveground mass M , were developed for the palm species Euterpe precatoria Mart., which is the most abundant tree species in the Amazon. We harvested twenty palms including above- and below-ground parts in an old growth Amazonian forest in Brazil. The diameter at breast height D ranged from 3.9-12.7 cm, and the stem height H ranged from 2.3-16.4 m. The D, diameter at ground basis D , crown diameter CD, H, stem specific gravity ρ, and number of fronds Nf were considered as independent variables and incorporated into a power function model. The best predictors were D Hρ for M and M , D HN for Ml, and D for M . Slender index (H/D) ranged from 0.56-1.46 m cm , and the D-H relationship suggested that the stem shape becomes more slender with increasing D. On the other hand, ρ increased with D implying a stiffening of stem tissue. The average root/shoot ratio was estimated as 0.29 which was higher than that reported for the non-palm tree species in the Amazon. Comparisons of several models to estimate M of different palm species, suggested that the variations of the D-H relationship and ρ should be considered to develop allometric models for estimating biomass in palm species. In particular the ρ largely varied depending on individual size, which should be important to consider, when developing the allometric models for palms. s r a 0 s a f r a 2 2 . -1

    DOI: 10.3390/f6020450

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • A new 500-m resolution map of canopy height for Amazon forest using spaceborne LiDAR and cloud-free MODIS imagery Reviewed

    Yoshito Sawada, Rempei Suwa, Keiji Jindo, Takahiro Endo, Kazuo Oki, Haruo Sawada, Egidio Arai, Yosio Edemir Shimabukuro, Carlos Henrique Souza Celes, Moacir Alberto Assis Campos, Francisco Gasparetto Higuchi, Adriano José Nogueira Lima, Niro Higuchi, Takuya Kajimoto, Moriyoshi Ishizuka

    International Journal of Applied Earth Observation and Geoinformation   43   92 - 101   2015

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    In the present study, we aimed to map canopy heights in the Brazilian Amazon mainly on the basis of spaceborne LiDAR and cloud-free MODIS imagery with a new method (the Self-Organizing Relationships method) for spatial modeling of the LiDAR footprint. To evaluate the general versatility, we compared the created canopy height map with two different canopy height estimates on the basis of our original field study plots (799 plots located in eight study sites) and a previously developed canopy height map. The compared canopy height estimates were obtained by: (1) a stem diameter at breast height (D) - tree height (H) relationship specific to each site on the basis of our original field study, (2) a previously developed D-H model involving environmental and structural factors as explanatory variables (Feldpausch et al., 2011 ), and (3) a previously developed canopy height map derived from the spaceborne LiDAR data with different spatial modeling method and explanatory variables (Simard et al., 2011 ). As a result, our canopy height map successfully detected a spatial distribution pattern in canopy height estimates based on our original field study data (r = 0.845, p = 8.31 × 10 ) though our canopy height map showed a poor correlation (r= 0.563, p = 0.146) with the canopy height estimate based on a previously developed model by Feldpausch et al. (2011). We also confirmed that the created canopy height map showed a similar pattern with the previously developed canopy height map by Simard et al. (2011). It was concluded that the use of the spaceborne LiDAR data provides a sufficient accuracy in estimating the canopy height at regional scale. -3

    DOI: 10.1016/j.jag.2015.04.003

    Scopus

    J-GLOBAL

    researchmap

  • The changing of radiocesium distribution in forests through three and a half years after the Fukushima NPP accident

    Imamura Naohiro, Kajimoto Takuya, Takahashi Masamichi, Akama Akio, Kobayashi Masahiro, Ohashi Shinta, Komatsu Masabumi, Ikeda Shigeto, Saitoh Satoshi, Kaneko Shinji, Takano Tsutomu

    The Japanese Forest Society Congress   126 ( 0 )   845 - 845   2015

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.126.0_845

    CiNii Article

    researchmap

  • Methods for assessing the spatial distribution and dynamics of radiocesium in tree components in forest ecosystems

    KAJIMOTO TAKUYA, TAKANO TSUTOMU, SAITO SATOSHI, KURODA KATSUSHI, FUJIWARA TAKESHI, KOMATSU MASAFUMI, KAWASAKI TATSURO, OHASHI SHINTA, KIYONO YOSHIYUKI

    森林総合研究所研究報告   13 ( 3 )   113 - 136   2014.9

     More details

    Language:Japanese   Publisher:森林総合研究所  

    森林総合研究所では、福島第一原発事故により汚染された森林における放射性セシウムの分布や長期的な動態を把握するために、事故直後から福島県内の複数地点のスギ林や広葉樹林など異なる森林に試験地を設けて研究を行ってきた。ここでは、調査林分の概況と、研究手法のうち、樹木地上部、小径木及び下層植生を対象にした放射性セシウム濃度と林分全体の蓄積量の測定及び推定法を紹介する。とくに、幹の各部位(樹皮、辺材、心材)に区別した試料の採取や調整の仕方と、これら幹各部位と枝葉の現存量推定法については、調査林分での推定結果の一部を踏まえながら、方法上の問題点や今後の課題などを検討する。

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • Winter climate change in plant-soil systems: summary of recent findings and future perspectives

    Kobayashi Makoto, Takuya Kajimoto, Lina Koyama, Gaku Kudo, Hideaki Shibata, Yosuke Yanai, J. H. C. Cornelissen

    ECOLOGICAL RESEARCH   29 ( 4 )   593 - 606   2014.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY  

    The winter climate is changing in many parts of the world, and it is predicted that winter climate change will modify the structure and function of plant-soil systems. An understanding of these changes and their consequences in terrestrial ecosystems requires knowledge of the linkage between above- and below-ground components as well as the species interactions found in plant-soil systems, which have important implications for biogeochemical cycles. However, winter climate-change studies have focused on only a part of the ecosystem or ecological process. We summarize here recent findings related to the effects of winter climate and its changes on soil nitrogen (N) dynamics, greenhouse gas (N2O) emissions from the soil, N use by individual plants, vegetation development, and interactions between vegetation and pollinators to generate an integrative understanding of the response of the plant-soil system to winter climate change. This review indicates that the net effects on plants, soil microbes, pollinators, and the associated biogeochemical cycles are balanced among several processes and are highly variable depending on the context, such as the target species/functional group, original winter condition of the habitat, and type of climate change. The consequences of winter climate change for species interactions among plants, associated animals, and biogeochemical cycles are largely unknown. For further research, a large-scale comparative study to measure ecosystem-level functions is important, especially in less-cold ecosystems.

    DOI: 10.1007/s11284-013-1115-0

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • CH4 and N2O dynamics of a Larix gmelinii forest in a continuous permafrost region of central Siberia during the growing season

    Tomoaki Morishita, Yojiro Matsuura, Takuya Kajimoto, Akira Osawa, Olga A. Zyryanova, Anatoly S. Prokushkin

    POLAR SCIENCE   8 ( 2 )   156 - 165   2014.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Forest soils are generally sinks of CH4 and sources of N2O. To characterize the dynamics of these major greenhouse gases in central Siberia during the growing season, we measured fluxes from forest soil and assessed the relationships between CH4 and N2O fluxes and forest floor vegetation types, soil temperature, and moisture conditions. At the soil surface, both CH4 uptake and emission (-6.6 to 3.1 mu g CH4-C m(-2) h(-1)) were observed, and CH4 fluxes did not differ among vegetation types. CH4 flux was positively correlated with soil moisture, but not with soil temperature. The small CH4 uptake compared with previous reports was due to CH4 production in response to high precipitation. N2O was also emitted and taken up by soil (-0.2 to 0.4 mu g N2O-N m(-2) h(-1)), and N2O fluxes did not differ among vegetation types. N2O flux was negatively correlated with soil moisture and not correlated with soil temperature. Our findings suggest that high soil moisture and low availability of mineral nitrogen resulted in N2O uptake due to denitrification. Furthermore, both CH4 and N2O were emitted from a river at the site; these were produced in the basin of the riverbank rather than deep in the soil. (C) 2014 Elsevier B.V. and NIPR. All rights reserved.

    DOI: 10.1016/j.polar.2014.01.004

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Allometry for juvenile trees in an amazonian forest after wind disturbance

    Gabriel Henrique Pires de Mello Ribeiro, Rempei Suwa, Daniel Magnabosco Marra, Adriano José Nogueira Lima, Takuya Kajimoto, Moriyoshi Ishizuka, Niro Higuchi

    Japan Agricultural Research Quarterly   48 ( 2 )   213 - 219   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan International Research Center for Agricultural Sciences  

    Allometric models to estimate the aboveground mass AGM, belowground mass BGM and total mass TM of juvenile trees (stem diameter at breast height DBH ≤ 5 cm, tree height H ≥ 30 cm) in open-canopy terra-firme forests after wind disturbance were developed in the Amazon. For comparison, the allometric models were also developed for a closed-canopy terra-firme forest. After six models had been compared in each forest type, the model with diameter at ground basis DGB and H was selected as the best for estimating AGM and TM, and the model with diameter at ground basis DGB as a single variable was selected as the best for estimating BGM considering the adjusted coefficient of determination and standard deviation of the mean. Models based on the diameter at breast height DBH showed poor correlation with each biomass component compared with those based on DGB for the open-canopy forest. The juvenile trees in the open-canopy forest showed higher AGM and H at a given DGB than in the closed-canopy forest, while the DGB-BGM relationships did not differ significantly between the open-and closed-canopy forests. It was concluded that the allometric models used to estimate AGM and TM were unique to each forest type. This would be because light-demanding species show higher allocation to AGM than BGM to be advantageous for competition for light by achieving rapid growth in height.

    DOI: 10.6090/jarq.48.213

    Scopus

    J-GLOBAL

    researchmap

  • Examination of vertical distribution of fine root biomass in a tropical moist forest of the central amazon, Brazil

    Hideyuki Noguchi, Rempei Suwa, Cacilda Adélia Sampaio de Souza, Roseana Pereira da Silva, Joaquim dos Santos, Niro Higuchi, Takuya Kajimoto, Moriyoshi Ishizuka

    Japan Agricultural Research Quarterly   48 ( 2 )   231 - 235   2014

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan International Research Center for Agricultural Sciences  

    Fine roots are an important component of the carbon flow of forests. Soil properties in tropical forest (terra firme forest) of the Central Amazon differ substantially along topography, and the biomass and vertical distribution of fine roots may also differ accordingly. Information on the vertical distribution of fine roots is essential to obtain unbiased estimates of fine root biomass. Accordingly, we examined fine root biomass and its vertical pattern along the gradient of topography in a typical terra firme forest in this region. The regressions on the cumulative fine root biomass along soil depth (at 5 cm intervals from 0-40 cm in depth) revealed significantly different vertical distribution of fine root biomass among three topographic habitats (lower-slope valley called baixio, mid-slope, and upper-slope plateau). A shallower rooting pattern was observed in the plateau than the other habitats, while fine root biomass was larger in the baixio than the plateau-a difference likely attributable to the soil physical properties than the aboveground stand structures among the sites. More than 74 and 93% of the fine root biomass was estimated to be distributed within the upper 20-and 40-cm soil layers, respectively. Our results suggested that a shallow sampling depth, which is common in fine root research in the Amazon, would be reasonable, though we should examine the consistency of our results in different regions.

    DOI: 10.6090/jarq.48.231

    Scopus

    J-GLOBAL

    researchmap

  • Distribution of radiocesium in forests depositted two and a half years after the Fukushima nuclear accident

    Komatsu Masabumi, Akama Akio, Ikeda Shigeto, Saitoh Satoshi, Takano Tsutomu, Kaneko Shinji, Kajimoto Takuya, Takahashi Masamichi

    The Japanese Forest Society Congress   125 ( 0 )   766 - 766   2014

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.125.0_766

    CiNii Article

    researchmap

  • Significance of topographic gradient in stem diameter - Height allometry for precise biomass estimation of a tropical moist forest in the central Amazon

    Rempei Suwa, Takeshi Sakai, Joaquim dos Santos, Roseana Pereira da Silva, Takuya Kajimoto, Moriyoshi Ishizuka, Niro Higuchi

    Japan Agricultural Research Quarterly   47 ( 1 )   109 - 114   2013

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    We developed a stem diameter D-height H allometric model that included variability in the D-H relationship along a topographic gradient. The study site was located along a belt transect (2500 × 20 m) established in a primary tropical forest near Manaus, Brazil. The transect included typical topography of the region, characterized by plateaus and valleys called "baixios". The D-H allometric model (n = 1307) indicated that potential tree height increased significantly, from 28 m at the lowest baixio plot to 35 m at the highest plateau plot. Consequently, by combining the D-H allometric model and an allometric equation with the variable D2H, biomass was estimated for trees (D &gt
    10 cm) in each sub-plot (20 × 20 m). Ignoring variability in the D-H relationship introduced wide-ranging error to biomass estimation
    error values ranged from -5% at a baixio plot to +6% at a plateau plot. Average biomass was 317 ± 28 (SE) Mg ha-1, and tree density and biomass fell significantly with decreasing relative elevation.

    DOI: 10.6090/jarq.47.109

    Scopus

    J-GLOBAL

    researchmap

  • Fine root dynamics in a tropical forest of the central Amazon measured by flat bed scanners

    Noguchi Hideyuki, Souza Cacilda Adélia Sampaio, Silva Rosiane Oliveira, Ourique Lucas, Suwa Rempei, Kajimoto Takuya, Ishizuka Moriyoshi, Pinto Alberto Carlos Martins, Lima Adriano José Nogueira, Santos Joaquim, Higuchi Niro

    The Japanese Forest Society Congress   124   208 - 208   2013

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.124.0.208.0

    CiNii Article

    researchmap

  • Distribution of radiocaesium in forests after one and a half years from the Fukushima nuclear power plant accident

    KANEKO Shinji, TAKAHASHI Masamichi, AKAMA Akio, IKEDA Shigeto, SANO Tetsuya, MIURA Satoru, OHNUKI Yasuhiro, HIRAI Keizo, SHICHI Koji, SAKATA Tadashi, HASHIMOTO Shoji, KAJIMOTO Takuya, TANAKA Hiroshi, SAITO Satoshi, TAKANO Tsutomu, ONO Kenji

    The Japanese Forest Society Congress   124   383 - 383   2013

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.124.0.383.0

    CiNii Article

    researchmap

  • Light estimation in un-uniformly distributed crown according to leaf cluster units.

    Kabeya Daisuke, Saito Satoshi, Migita Chiharu, Han Qingmin, Kawasaki Tatsuro, Tobita Hiroyuki, Kajioto Takuya

    The Japanese Forest Society Congress   124   707 - 707   2013

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.124.0.707.0

    CiNii Article

    researchmap

  • The simulation of the surface shape of the crown and the light environment, in the established Cryptomeria japonica stand with the different thinning conditions.

    KAWASAKI Tatsuro, SAITO Satoshi, KAJIMOTO Takuya, Han Qingmin, MIGITA Chiharu, KABEYA Daisuke

    The Japanese Forest Society Congress   124   530 - 530   2013

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.124.0.530.0

    CiNii Article

    researchmap

  • Allometric models for estimating above- and below-ground biomass in Amazonian forests at Sao Gabriel da Cachoeira in the upper Rio Negro, Brazil

    Adriano Jose Nogueira Lima, Rempei Suwa, Gabriel Henrique Pires de Mello Ribeiro, Takuya Kajimoto, Joaquim dos Santos, Roseana Pereira da Silva, Cacilda Adelia Sampaio de Souza, Priscila Castro de Barros, Hideyuki Noguchi, Moriyoshi Ishizuka, Niro Higuchi

    FOREST ECOLOGY AND MANAGEMENT   277   163 - 172   2012.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Precise estimation of biomass at a regional scale is required for evaluating forest carbon stocks throughout the Amazon. We examined six types of allometric models to identify the best estimator of biomass in primary forests (terra firme) in the northwestern sector of the Brazilian Amazon. We also tested six regression models for estimating tree height. We developed each allometric model using measurements of 101 trees excavated in a primary forest distributed along the upper Rio Negro. A simple power function with stem diameter at breast height D as a single variable was selected as the best model for estimating each biomass component, i.e. above-ground total mass AGW, below-ground total mass BGW, and whole individual mass. Among models developed to estimate tree height H from D, we selected a regression model with a coefficient corresponding to an asymptotic height as the best fit. The D-AGW relationship at our study site differed significantly from models developed previously for other regions of the Amazon. We explain this regional variation in part by regional differences in D-H relationships of sample trees. The D-BGW relationship at our site also differed significantly from that in the central Amazon. However, AGW-BGW relationships were consistent between the upper Rio Negro forest and other forests in the central Amazon, in that the BGW-AGW ratio was constant as 0.136 regardless of tree size. On the basis of D-based allometry and census data from 23 plots established in the upper Rio Negro region, we estimated a stand-level total biomass (dry mass) of 252.6 Mg ha(-1). This estimate is at least 73% lower than the potential stand biomass for the region previously suggested by several meta-analyses. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.foreco.2012.04.028

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • 東京電力福島第一原子力発電所事故による森林放射能汚染の実態調査

    金子真司, 外崎真理雄, 清野嘉之, 池田重人, 黒田克史, 田中浩, 川崎達郎, 齊藤哲, 梶本卓也, 阿部真, 杉田久志, 矢崎健一, 太田敬之, 三浦覚, 志知幸治, 大貫靖浩, 阪田匡司, 篠宮佳樹

    関東森林研究   63 ( 1 )   97 - 100   2012.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • Individual growth change in an old-growth plantation of pinus densiflora after thinning prescription Reviewed

    Takashi Masaki, Shigeta Mori, Takuya Kajimoto, Shuhei Aizawa, Shigeto Ikeda, Tsutomu Yagihashi, Morie Shibata, Gaku Hitsuma

    Nihon Ringakkai Shi/Journal of the Japanese Forestry Society   93 ( 2 )   48 - 57   2011.6

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    Individual growth change of Pinus densiflora during 8 years after thinning prescription in a 94-year-old plantation was investigated comparing it with an unthinned plantation of the same age and a 140-year-old natural stand, to test whether growth of trees could be improved by thinning, what individual traits would affect growth improvement, and whether it would be possible or not to produce large sized timber in the plantations as found in the natural stand at 140 years. Trees in the plantations were characterized by smaller size (DBH=41 cm, H=25-30 m) than old-growth natural stand (DBH=68 cm, H=30-35 m). H/DBH ratio and proportion of crown length suggested that trees in the plantations were more vulnerable to external disturbance such as heavy snow and had less leaf mass than those in the natural stand. After thinning, about 40% of the trees showed an improved annual DBH increment (by ca. 0.1 cm yr -1), whereas 80% of the trees in the unthinned plantation showed deceleration of DBH growth. Change in degree of competition with neighbors or individual variation in leaf mass did not explain inter-individual variation in growth improvement. Improved growth did not appear to be enough to reach equivalent size to trees in the natural stand at the age of 140 years.

    DOI: 10.4005/jjfs.93.48

    Scopus

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • The simulated canopy structure and openness of Cryptomeria japonica, tuned by the light transmittance of the foliage

    KAWASAKI Tatsuro, SAITO Satoshi, KAJIMOTO Takuya, Han Qingmin, MIGITA Chiharu

    The Japanese Forest Society Congress   123   Pa154 - Pa154   2011

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.123.0.Pa154.0

    CiNii Article

    researchmap

  • Regional variation of fine root biomass in tropical rain forests of the Brasilian Amazon

    Noguchi Hideyuki, de Souza Cacilda Adélia Sampaio, Suwa Rempei, Kajimoto Takuya, Ishizuka Moriyoshi, Lima Adriano José Nogueira, de Mello Ribeiro Gabriel Henrique Pires, de Barros Priscila Castro, da Silva Roseana Pereira, Pinto Alberto Carlos Martins, dos Santos Joaquim, Higuchi Niro

    The Japanese Forest Society Congress   123   Pa064 - Pa064   2011

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.123.0.Pa064.0

    CiNii Article

    researchmap

  • Vertical variations in stem and foliage respiration rates of Chamaecyparis obtusa trees

    Araki Masatake G., Utsugi Hajime, Kajimoto Takuya, Han Qingmin, Kawasaki Tatsuro, Chiba Yukihiro, Gyokusen Koichiro

    The Japanese Forest Society Congress   123   J06 - J06   2011

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.123.0.J06.0

    CiNii Article

    researchmap

  • Distribution of radio Cs in biomass of Cryptomeria forest and Pinus forest after an accident at the Fukushima Daiichi Nuclear Power Station, and life span of Criptomeria leaf

    Kiyono Yoshiyuki, Saito Satoshi, Kawasaki Tatsuro, Tanaka Hiroshi, Sugita Hisashi, Yazaki Kenichi, Kajimoto Takuya, Ota Hiroyuki, Abe Shin, Kuroda Katsushi, Tonosaki Mario, Kanazashi Tatsuro, Nishiyama Yoshihiko, Akama Akio, Kaneko Shinji, Takahashi Masamichi

    The Japanese Forest Society Congress   123   I17 - I17   2011

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.123.0.I17.0

    CiNii Article

    researchmap

  • Estimation of root biomass based on excavation of individual root systems in a primary dipterocarp forest in Pasoh Forest Reserve, Peninsular Malaysia

    Kaoru Niiyama, Takuya Kajimoto, Yojiro Matsuura, Tamon Yamashita, Naoko Matsuo, Yuichiro Yashiro, Azizi Ripin, Abd. Rahman Kassim, Nur Supardi Noor

    JOURNAL OF TROPICAL ECOLOGY   26 ( 3 )   271 - 284   2010.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CAMBRIDGE UNIV PRESS  

    Precise estimation of root biomass is important for understanding carbon stocks and dynamics in tropical rain forests. However, limited information is available on individual root masses, especially large trees. We excavated 121 root systems of various species (78) and sizes (up to 116 cm in dbh). and estimated both above- and below-ground biomass in a lowland primary dipterocarp forest in the Pasoh Forest Reserve, Peninsular Malaysia. A tree census was conducted in four research plots (each 0.2 ha) and stand-level biomass was estimated. We examined relationships between tree size parameters and masses of coarse roots (roots &gt;= 5 mm in diameter) and derived a dbh-based allometric equation. The amounts of coarse roots that were lost during excavation were corrected. Coarse-root biomass before and after correction for lost roots was estimated to be 63.8 and 82.7 Mg ha(-1), indicating that significant amounts of roots (23%) were lost during the sampling. We also estimated the biomass of small root (&lt;5 mm) by applying pipe-model theory. The estimate, 13.3 Mg ha(-1), was similar to another estimate of small roots, 16.4 Mg ha(-1), which was obtained directly by the soil-pit sampling method. Total below-ground (BGB) and above-ground biomass (AGB) was estimated to be 95.9 and 536 Mg ha(-1), respectively. The biomass-partitioning ratio (BGB/AGB) was about 0.18. In conclusion, the dbh-based allometric equation for coarse roots developed in this study, which kept good linearity even including the data of larger trees, might be useful for evaluating below-ground carbon stocks in other stands of similar forest (old-growth dipterocarp) in South-East Asia.

    DOI: 10.1017/S0266467410000040

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Estimation of whole-stem respiration, incorporating vertical and seasonal variations in stem CO2 efflux rate, of Chamaecyparis obtusa trees

    Masatake G. Araki, Hajime Utsugi, Takuya Kajimoto, Qingmin Han, Tatsuro Kawasaki, Yukihiro Chiba

    JOURNAL OF FOREST RESEARCH   15 ( 2 )   115 - 122   2010.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    We examined vertical and seasonal variations in stem respiration rates in a 50-year-old plantation of Japanese cypress, Chamaecyparis obtusa (Sieb. et Zucc.) Endl., in central Japan, and discuss a practical and precise method to scale a point-measured stem CO2 efflux rate up to whole-stem respiration. For five selected trees, stem CO2 efflux rates were measured at breast height (1.3 m) and at five or six points above breast height (at approximately 2 m intervals) every 1 or 2 months over two consecutive years. Daily total stem respiration rate (surface area basis) was greater inside the crown than below the crown, especially during the growing season. By incorporating the vertical profile of the respiration rate, annual whole-stem respiration was estimated for each sample tree (R (y)). We then compared this estimate (R (y)) with another estimate of annual whole-stem respiration (R&apos;(y)) obtained using a conventional method; it is assumed that the area-based respiration rate at breast height is constant throughout the stem. The ratio of these two estimates (R&apos;(y)/R (y)) was usually less than 1, indicating that the assumptions used to calculate R&apos;(y) underestimate annual whole-stem respiration. We found that R&apos;(y)/R (y) was negatively correlated with the ratio of crown length to tree height (crown ratio). These results suggest that annual whole-stem respiration in this C. obtusa plantation is substantially affected by the relative proportion of within-crown stem with higher respiratory activity. Methodologically, our results imply that incorporating the crown ratio into the conventional method would improve the accuracy of annual whole-stem respiration estimates.

    DOI: 10.1007/s10310-009-0163-3

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Mixed-power scaling of whole-plant respiration from seedlings to giant trees

    Shigeta Mori, Keiko Yamaji, Atsushi Ishida, Stanislav G. Prokushkin, Oxana V. Masyagina, Akio Hagihara, A. T. M. Rafiqul Hoque, Rempei Suwa, Akira Osawa, Tomohiro Nishizono, Tatsushiro Ueda, Masaru Kinjo, Tsuyoshi Miyagi, Takuya Kajimoto, Takayoshi Koike, Yojiro Matsuura, Takeshi Toma, Olga A. Zyryanova, Anatoly P. Abaimov, Yoshio Awaya, Masatake G. Araki, Tatsuro Kawasaki, Yukihiro Chiba, Marjnah Umari

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   107 ( 4 )   1447 - 1451   2010.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATL ACAD SCIENCES  

    The scaling of respiratory metabolism with body mass is one of the most pervasive phenomena in biology. Using a single allometric equation to characterize empirical scaling relationships and to evaluate alternative hypotheses about mechanisms has been controversial. We developed a method to directly measure respiration of 271 whole plants, spanning nine orders of magnitude in body mass, from small seedlings to large trees, and from tropical to boreal ecosystems. Our measurements include the roots, which have often been ignored. Rather than a single power-law relationship, our data are fit by a biphasic, mixed-power function. The allometric exponent varies continuously from 1 in the smallest plants to 3/4 in larger saplings and trees. Therefore, our findings support the recent findings of Reich et al. [Reich PB, Tjoelker MG, Machado JL, Oleksyn J (2006) Universal scaling of respiratory metabolism, size, and nitrogen in plants. Nature 439: 457-461] and West, Brown, and Enquist [West GB, Brown JH, Enquist BJ (1997) A general model for the origin of allometric scaling laws in biology. Science 276: 122 - 126.]. The transition from linear to 3/4-power scaling may indicate fundamental physical and physiological constraints on the allocation of plant biomass between photosynthetic and nonphotosynthetic organs over the course of ontogenetic plant growth.

    DOI: 10.1073/pnas.0902554107

    Web of Science

    Scopus

    PubMed

    J-GLOBAL

    researchmap

  • Root system development of larch trees growing on Siberian permafrost Reviewed

    KAJIMOTO Takuya

    Permafrost Ecosystems: Siberian Larch Forests. Ecological Studies 209, Springer   303 - 330   2010

     More details

  • Biomass and productivity of Siberian larch forest ecosystems Reviewed

    KAJIMOTO Takuya

    Permafrost Ecosystems: Siberian Larch Forests. Ecological Studies 209, Springer   99 - 122   2010

     More details

    Language:English  

    DOI: 10.1007/978-1-4020-9693-8_6

    researchmap

  • Eddy covariance CO2 flux above a Gmelin larch forest on continuous permafrost in Central Siberia during a growing season

    Y. Nakai, Y. Matsuura, T. Kajimoto, A. P. Abaimov, S. Yamamoto, O. A. Zyryanova

    THEORETICAL AND APPLIED CLIMATOLOGY   93 ( 3-4 )   133 - 147   2008.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER WIEN  

    Gmelin larch ( Larix gmelinii) forests are representative vegetation in the continuous permafrost region of Central Siberia. Information on the carbon budget is still limited for this Siberian larch taiga in comparison to boreal forests in other regions, while the larch forests are expected to play a key role in the global carbon balance due to their wide distribution over North-East Eurasia. The authors reported results of eddy covariance CO2 flux measurements at a mature Gmelin larch stand in Central Siberia, Russia (64 degrees 16'N, 100 degrees 12'E, 250m a.s.l.). The measurements were conducted during one growing season (June-early September in 2004). CO2 uptake was initiated in early June and increased sharply until late June, which was closely related to the phenology of the larch trees (i.e., bud-break and needle flush). Maximum half-hourly net CO2 uptake was similar to 6 mu mol m(-2) s(-1). Maximum daily net uptake of similar to 2 g C m(-2) day(-1) occurred at the end of June and in mid-July. Cumulative net uptake was 76-78 g C m(-2), indicating that the mature larch forest acted as a net sink for CO2 during the growing season (91 days). In comparison with other boreal forests, however, the magnitude of net CO2 uptake and night-time release of the forest, and cumulative net CO2 uptake were lower. We suggest that lower net ecosystem CO2 uptake of the study stand was primarily associated with low leaf area index.

    DOI: 10.1007/s00704-007-0337-x

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • 根の生態学, 森田茂紀・田島良介監訳, シュプリンガー・ジャパン, 2008年6月, 364ページ, 6,510(税込), ISBN978-4-431-72735-4

    梶本 卓也

    森林科学   53   68 - 68   2008

     More details

    Language:Japanese   Publisher:日本森林学会  

    DOI: 10.11519/jjsk.53.0_68

    CiNii Article

    researchmap

  • Responses of ring widths and maximum densities of Larix gmelinii to climate on contrasting north- and south-facing slopes in central Siberia

    Joni Kujansuu, Koh Yasue, Takayoshi Koike, Anatoly P. Abaimov, Takuya Kajimoto, Takashi Takeda, Morihiko Tokumoto, Yojiro Matsuura

    ECOLOGICAL RESEARCH   22 ( 4 )   582 - 592   2007.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    An analysis was performed of the climatic responses of the radial growth of Larix gmelinii (Rupr.) Rupr. at two sites-both of which included contrasting north- and south-facing slopes-in Tura, central Siberia, with the development of ring width and maximum-density chronologies for each slope. Both residual and standard chronologies of ring widths were positively correlated with temperature from late May until mid June on all four slopes. By contrast, standard chronologies of ring widths were negatively correlated with precipitation during the winter (from October to April) and in May on the north-facing slope at site 1 and on the south-facing slope at site 2 respectively. The negative correlations with precipitation during the winter and in May on some of the slopes suggested that delayed snowmelt in early spring might inhibit the radial growth of L. gmelinii, and the effects of snow are likely to vary with topography. Both residual and standard chronologies of maximum densities were positively correlated with temperature in early July on all four slopes. Maximum densities were also positively correlated with precipitation during summer of the previous year on all the slopes. These suggest that no major differences exist in terms of responses of maximum density to climatic factors between the north- and south-facing slopes.

    DOI: 10.1007/s11284-006-0062-4

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Climatic responses of tree-ring widths of Larix gmelinii on contrasting north-facing and south-facing slopes in central Siberia

    Joni Kujansuu, Koh Yasue, Takayoshi Koike, Anatoly P. Abaimov, Takuya Kajimoto, Takashi Takeda, Morihiko Tokumoto, Yojiro Matsuura

    JOURNAL OF WOOD SCIENCE   53 ( 2 )   87 - 93   2007.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    An analysis was performed on the climatic responses of the radial growth of Larix gmelinii (Rupr.) Rupr. on contrasting north-facing and south-facing slopes in Tura, central Siberia. We developed chronologies of tree-ring width for four plots, designated as north-upper, northlower, south-upper, and south-lower. Both residual and standard chronologies of tree-ring widths exhibited a significant positive correlation with temperature from the end of May until early June in all four plots. The chronologies of ring width did not reveal any major difference in the response to temperature among the four plots. The standard chronologies of ring widths on the north-facing slope were negatively correlated with precipitation during the winter (October-April) and in early and mid-May, whereas the residual chronologies did not reveal clear relationships with precipitation during the winter and May. The significant correlation between ring width and temperature from the end of May until early June indicates that temperatures in springtime play a significant role in the radial growth of L. gmelinii. The negative correlations between standard chronologies of tree-ring width and precipitation in the winter and in May on the north-facing slope indicate that lowfrequency fluctuations in snowfall have negative effects on the radial growth. However, these effects vary and depend on the microscale topography.

    DOI: 10.1007/s10086-006-0837-9

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Individual-based measurement and analysis of root system development: case studies for Larix gmelinii trees growing on the permafrost region in Siberia

    Takuya Kajimoto, Akira Osawa, Yojiro Matsuura, Anatoly P. Abaimov, Olga A. Zyryanova, Kazuma Kondo, Naoko Tokuchi, Muneto Hirobe

    JOURNAL OF FOREST RESEARCH   12 ( 2 )   103 - 112   2007.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    We present results of individual-based root system measurement and analysis applied for Larix gmelinii trees growing on the continuous permafrost region of central Siberia. The data of root excavation taken from the three stands were used for the analyses; young (26 years old), mature (105 years old), and uneven-aged over-mature stand (220 years old). In this article, we highlight two topics: (1) factors affecting spatio-temporal pattern of root system development, and (2) interactions between aboveground (i.e., crown) and belowground (i.e., root) competition. For the first topic, the detailed observation of lateral roots was applied to one sample tree of the overmature stand. The tree constructed a superficial (&lt; 30 cm in depth) and rather asymmetric root system, and each lateral root expanded mainly into elevated mounds rather than depressed troughs. This indicated that spatial development of an individual root system was largely affected by microtopography (i.e., earth hummocks). For these lateral roots, elongation growth curves were reconstructed using annual-ring data, and annual growth rates and patterns were compared among them. The comparison suggested that temporal root system development is associated with differences in carbon allocation among the lateral roots. For the second topic, we examined relationships between individual crown projection area (CA) and horizontal rooting area (RA) for the sample trees of each stand. RA was almost equal to CA in the young stand, while RA was much larger (three or four times) than CA in the mature and overmature stands. Two measures of stand-level space occupation, crown area index (aboveground: CAI; sum of CAs per unit land area) and rooting area index (belowground: RAI; sum of RAs), were estimated in each stand. The estimates of RA1 (1.3-1.8 m(2) m(-2)) exceeded unity in all stands. In contrast, CAI exceeded unity (1.3 m(2) m(-2)) only in the young stand, and was much smaller (&lt; 0.3 m(2) m(-2)) in the two older stands. These between-stand differences in RAI-CAI relationships suggest that intertree competition for both aboveground and belowground spaces occurred in the young stand, but only belowground competition still occurred in the two older stands. Based on this finding, we hypothesized that competition below the ground may become predominant as a stand ages in L. gmelinii forests. Methodological limitations of our analysis are also discussed, especially for the analysis using the two indices of space occupation (CAI, RAI).

    DOI: 10.1007/s10310-006-0259-y

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Tree Densities and Prediction Models for Plantations and Reforestation-abandoned Sites after Clear Cutting- in Kyushu Island

    Saito S, Inoue N, Noda R, Yamada Y, Saho K, Takamiya T, Yokoo K, Kominami Y, Nagamatsu D, Sato T, Kajimoto T

    JOURNAL OF THE JAPANESE FORESTRY SOCIETY   88 ( 6 )   482 - 488   2006.12

     More details

    Language:Japanese   Publisher:一般社団法人日本森林学会  

    We analyzed the species and densities of established tree with height&amp;ge;1.3 m in 59 conifer plantations and 41 reforestation-abandoned sites after clear cutting (i.e. clear-cut sites) on Kyushu Island. Natural or secondary broad-leaved forests (i.e. broad-leaved forests, n=l7) were also investigated for the purpose of comparison. Based on these field data, we developed prediction models for tree establishment. Mean densities of trees established in both plantations and clear-cut sites were lower than in broad-leaved forests, especially for species dominating the canopy layer of natural forests, such as Fagaceae. The coefficients of determination of the prediction models were larger for a group of pioneer tree species than for all pooled species in both plantations and clear-cut sites. Major factors affecting tree establishment were different between the plantations (slope inclination) and the clear-cut sites (altitude and slope direction) , although stand age (including years after clear-cutting) affected tree establishment most in both sites. Basic site information (e.g. altitude) and stand description data (e.g. stand age) were useful for the prediction. The accuracy of the prediction model was improved by grouping tree species with similar growth and/or regeneration characteristics.

    DOI: 10.4005/jjfs.88.482

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • Long-term growth analyses of Japanese cedar trees in a plantation: neighborhood competition and persistence of initial growth deviations

    Takashi Masaki, Shigeta Mori, Takuya Kajimoto, Gaku Hitsuma, Satoshi Sawata, Masuo Mori, Katsuhiro Osumi, Shobu Sakurai, Takeshi Seki

    JOURNAL OF FOREST RESEARCH   11 ( 4 )   217 - 225   2006.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    The individual growth of tree diameter at breast height (dbh) is analyzed in an even-aged plantation of Cryptomeria japonica from stand age of 45 to 94 years, to examine how the growth of individual trees has been affected by the changes in spacing resulting from thinning operations. At any age, a significant proportion (0.37-0.46) of the variation in dbh growth during a 5-11-year period was explained by dbh at the beginning of the period, probably due to greater leaf mass of larger trees. Next, either one-sided or two-sided competition was added to the model, by calculating the basal area (BA) of neighboring trees around each tree within a given radius or BA for trees having larger dbh than the focal tree within the radius. After preliminary analyses, a radius of 8 m was selected as the critical range for tree competition. Although both types of competition explained a significant proportion (0.09-0.43) of growth variation, one-sided competition was not significant at ages greater than 54 years. Based on the model at 45 years of age, the initial deviation of growth rate for each tree from the predicted rate was calculated and added to the models as a third variable. This raised the coefficient of determination up to 0.50-0.74. These findings have practical significance for forest plantation management, particularly for controlling the growth of standing trees via thinning, to produce high-quality timber in the future.

    DOI: 10.1007/s10310-005-0175-6

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Growth pattern analysis and stemwood production in an unmanaged old plantation of hiba, Thujopsis dolabrata, in northern Japan

    T Kajimoto, G Hitsuma, T Masaki, T Kanazashi

    JOURNAL OF FOREST RESEARCH   11 ( 2 )   107 - 116   2006.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    We analyzed the growth patterns of Thujopsis dolabrata var. hondai trees in an old plantation (161 years old), where no silvicultural treatments (e.g., thinning) have been conducted since the initial planting. The analysis focused on understanding individual growth under a long-term self-thinning process, and the stand-level stemwood production at the mature stage was evaluated. Nine canopy-layer trees and one suppressed tree were used for the analysis of annual increments in stem diameters, heights, and stemwood volumes for a given past year using the ring-width data. Both the diameter (at basal portion) and height of all the canopy-layer trees increased at similar rates during the early stage (i.e., 60-70 years after planting); however, after this period, only the height growth rates declined sharply. The annual growth rates of stemwood volume also simultaneously leveled off at the stand age of 40-60 years. Subsequently, the patterns diverged conspicuously, e.g., the growth rates were maintained or increased in some individuals, while it gradually decreased in the case of others until the present year. The divergence of growth pattern was likely to be triggered by intertree competition at several decades after the onset of canopy closure. The current stemwood production of the sample trees, including the suppressed one, was positively correlated with certain size parameters such as stem diameter at breast height and sap-wood area at a height of 4m. Based on the diameter-base allometry, the total stand stemwood production was estimated to be about 12.8 m(3) ha(-1) year(-1). This estimate was higher than those of some old natural T. dolabrata forests (2.0-8.6 m(3) ha(-1) year(-1)) that have been well managed by repetitive selection thinning. Furthermore, individual mean stemwood production of the study plantation (0.03 m(3) tree(-1) year(-1)) was within the range of these natural stands (0.01-0.05 m(3) tree(-1) year(-1)). These comparisons suggested that the old T dolabrata plantation still maintained a relatively high stemwood production potential despite the absence of artificial controls of tree density in the past. In terms of timber production, this fact implied that a rather long rotation (&gt; 100 years) can be applicable in the management of T. dolabrata plantations.

    DOI: 10.1007/s10310-005-0193-4

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Size-mass allometry and biomass allocation of two larch species growing on the continuous permafrost region in Siberia

    T Kajimoto, Y Matsuura, A Osawa, AP Abaimov, OA Zyryanova, AP Isaev, DP Yefremov, S Mori, T Koike

    FOREST ECOLOGY AND MANAGEMENT   222 ( 1-3 )   314 - 325   2006.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We examined size-mass allometry and biomass allocation of two larch species (Larix gmelinii (Rupr.) Rupr. and Larix cajanderi Mayer) that grow on the continuous permafrost regions in Siberia. Sample tree data (total n = 27) gathered from four mature stands (&gt; 100 years old) were employed for analysis. First, to determine good size predictor of biomass, site-specific allometric relationships (log-linear equation form) were derived between dry mass of four components (stem, branch, needle and coarse root; &gt;= 5 mm in diameter) and seven size variables; stem diameters (breast height, 30 cm height and crown base), sapwood areas (breast height and 30 cm height), and two combined-variables (tree height x dia-diameter). For all components, site-specific allometric equations based on breast-height diameter (D) always gave high correlations as those using other size variables. However, between-stand comparisons of the D-base site-specific allometry indicated that size dependency (i.e., regression slope) differed for stem mass. Besides, needle and coarse root mass for a given size (i.e., regression intercept) differed significantly among the four stands. These facts implied that D-base regression model was reliable for biomass estimation by site-specific allometry, but was not suitable for developing general (i.e., site-common) allometry. Second, to examine carbon allocation pattern, we estimated each stand biomass by applying corresponding site-specific D-base allometry. Stand total biomass ranged from 8.6 to 33.1 Mg ha(-1), and aboveground-total/coarse root biomass ratio (i.e., T/R) ranged from 1.5 to 2.6. The variation was mainly due to trade-offs between stem and root biomass. Average T/R was about 2.3 that was calculated for some reported L. gmelinii and L. cajanderi stands (n = 16), including our four stands. This average T/R was extremely small in comparison to that (5.1) of Scots pine (Pinus sylvestris L.) stands on the non- or discontinuous permafrost regions in Siberia. This finding strongly suggested that the two Larix species invested annual carbon gains largely into root growth. We discussed its ecological implications in relation to stand structure and permafrost soil-N conditions in the larch taiga ecosystem. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.foreco.2005.10.031

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Climatic factors influencing fluxes of dissolved organic carbon from the forest floor in a continuous-permafrost Siberian watershed

    AS Prokushkin, T Kajimoto, SG Prokushkin, WH McDowell, AP Abaimov, Y Matsuura

    CANADIAN JOURNAL OF FOREST RESEARCH   35 ( 9 )   2130 - 2140   2005.9

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS  

    Fluxes of dissolved organic carbon (DOC) in forested watersheds underlain by permafrost are likely to vary with changes in climatic regime that increase soil moisture and temperature. We examined the effects of temporal and spatial variations in soil temperature and moisture on DOC fluxes from the forest floor of contrasting north- and south-facing slopes in central Siberia. DOC fluxes increased throughout the growing season (June-September) on both slopes in 2002 and 2003. The most favorable combination of moisture content and temperature (deepest active soil layer) occurred in September, and we believe this was the primary driver of increased DOC concentrations and flux in autumn. Total DOC flux for June-September was 12.6-17.6 g C(.)m(-2) on the south-facing slope and 4.6-8.9 g C(.)m(-2) on the north-facing slope. DOC concentrations in forest floor leachates increased with increasing temperature on the north-facing slope, but were almost unaffected by temperature on the south-facing slope. Our results suggest that water input in midseason from melting of ice or precipitation events is the primary factor limiting DOC production. Significant positive correlations between amounts of precipitation and DOC flux were found on both slopes. Dilution of DOC concentrations by high precipitation volumes was observed only for the forest floor leachates collected from the north-facing slope. Our results suggest that global warming will result in increased DOC production in forest floors of permafrost regions, and that precipitation patterns will play an important role in determining the magnitude of these changes in DOC flux as well as its interannual variability. However, the longer-term response of soils and DOC flux to a warming climate will be driven by changes in vegetation and microbial communities as well as by the direct results of temperature and moisture conditions.

    DOI: 10.1139/X05-150

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Mechanical damage on Abies mariesii trees buried below the snowpack

    T Seki, T Kajimoto, H Sugita, H Daimaru, S Ikeda, T Okamoto

    ARCTIC ANTARCTIC AND ALPINE RESEARCH   37 ( 1 )   34 - 40   2005.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:INST ARCTIC ALPINE RES  

    On a gentle leeward slope in a snowy forest limit in northern Honshu Island, Japan, mechanical damage by snow settlement and creep on Abies mariesii trees buried below the snowpack was examined to detect signs of the snow-damage effect on future survival and crown development. Damage types were recorded based on direct observation of crowns in 1996, a year of high snow accumulation exceeding 4.5 m, and 1997, a year of moderate snow accumulation. Of 153 trees examined, 63% were damaged in 1996 and 15% were damaged in 1997. The most destructive damage type was breakage of stems &GE; 5 cm in diameter, which occurred on eight trees in 1996 and three in 1997, resulting in foliage loss and death of some trees. The prevalent damage type was branch tearing, at branch-stem junctions primarily within a height range of 4-6 In, which occurred on 171 branches in 1996 and 5 in 1997. Under snowy and windy conditions, stem breakage and branch tearing, caused by forces active within restricted layers of the snowpack, may reduce the future survival and crown development of A. mariesii buried below the snowpack in years of heavy snowfall.

    Web of Science

    Scopus

    researchmap

  • Carbon storage in larch ecosystems in continuous permafrost region of Siberia

    Y. Matsuura, T. Kajimoto, A. Osawa, A. P. Abaimov

    PHYTON-ANNALES REI BOTANICAE   45 ( 4 )   51 - 54   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:FERDINAND BERGER SOEHNE  

    Deciduous coniferous taiga, larch (genus Larix) ecosystem is one of unique biomes in northeastern Eurasian Continent, where vast area of forest exists on continuous permafrost. We selected three representative sites for ecosystem research: 1) a forest near Yakutsk in Yakutian Basin, eastern Siberia (62N-129E), 2) a forest near Tura in central Siberian Plataeu (64N-100E), and 3) a forest tundra transition near Chersky in Kolyma lowland (69N-160E). We estimated C storage in both aboveground and belowground biomass, in forest floor, and in active layer as soil organic C and as carbonate-carbon. Soil organic C in active layer was the largest component in each site. Soils in Yakutsk and Tura showed carbonate-C accumulation in active layer, which might result from extreme continental climate with low annual precipitation. C storage in aboveground and belowground biomass varied among sites, however, ratios of above/belowground biomass C had a relatively narrow range from 1.1 to 1.5. High allocation rate of C to belowground part resulted from a kind of adaptation to effective nutrient acquisition under nutrient limited environment due to low soil temperature.

    Web of Science

    Scopus

    researchmap

  • Effects of snow avalanche disturbance on regeneration of subalpine Abies mariesii forest, northern Japan

    T Kajimoto, H Daimaru, T Okamoto, T Otani, H Onodera

    ARCTIC ANTARCTIC AND ALPINE RESEARCH   36 ( 4 )   436 - 445   2004.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:INST ARCTIC ALPINE RES  

    We examined the effects of snow avalanche on stand structure and the subsequent regeneration of subalpine Abies mariesii Mast forest in northern Japan, and discussed whether gap formation after avalanche disturbance leads to immediate seedling establishment or not. Tree size and age, tree-ring chronology, and seedling density were compared between, on, and around a relatively large avalanche path, which was created in the mid-1980s within Hachimantai National Park. On the avalanche path, only smaller and younger trees (height &lt;5 m, 50-100 yr old) escaped the mechanical damage of avalanche by leaning into the remaining snowpack, and old canopy trees were mostly killed by stem breakage. Tree size structure of the avalanche path, including both living and dead individuals, was relatively similar to that of nearby undisturbed forest, indicating that a mature stand (&gt;ca. 200 yr old) had been previously developed on the avalanche slope without large-scale disturbances in the past. Most of the surviving, younger trees showed abrupt growth release during the few years (1987-1989) after the avalanche event. However, densities of both post-avalanche (&lt; 15 yr old) and pre-avalanche (&gt; 15 yr old) seedlings were much lower on the avalanche path than in the nearby forest, especially at microsites covered with dense dwarf bamboo (Sasa kurilensis) shrub. The pre-avalanche seedlings on the avalanche path sharply increased annual height growth rates after the mid-1980s avalanche, but such positive growth response did not continue longer than 6 to 7 yr. These findings suggested that gap formation following the infrequent, large-scale avalanche disturbance did not necessarily lead to immediate seedling recruitment and/or further growth release of pre-avalanche seedlings. The constraint of seedling establishment was primarily explained by the lack of potential seed supply, and shading effect of the dwarf bamboo bush. Consequently, post-avalanche regeneration of the subalpine fir forest was likely to depend on the smaller individuals (2-5 m in height) that were able to avoid both the mechanical damage of avalanche and mortality from shading by the dwarf bamboo.

    Web of Science

    Scopus

    researchmap

  • Root system development of Larix gmelinii trees affected by micro-scale conditions of permafrost soils in central Siberia

    T Kajimoto, Y Matsuura, A Osawa, AS Prokushkin, MA Sofronov, AP Abaimov

    PLANT AND SOIL   255 ( 1 )   281 - 292   2003.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Spatial distributions of root systems of Larix gmelinii (Rupr.) Rupr. trees were examined in two stands in central Siberia: an even-aged stand (ca. 100 yrs-old) and a mature, uneven-aged (240-280 yrs-old) stand. Five larch trees of different sizes were sampled by excavating coarse roots (diameter &gt; 5 mm) in each stand. Dimensions and ages of all first-order lateral roots were measured. Micro-scale conditions of soil temperature and soil water suction ( each 10 cm deep) were also examined in relation to earth hummock topography (mound vs. trough) and/or ground floor vegetation types (moss vs. lichens). All larch trees developed superficial root systems, consisting of the aborted short tap root (10-40 cm in soil depth) and some well-spread lateral roots (n = 4-13). The root network of each tree was asymmetric, and its rooting area reached about four times the crown projection area. Lateral roots generally expanded into the upper soil layers of the mounds where summer soil temperature was 1-6degreesC higher than inside nearby troughs. Chronological analysis indicated that lateral root expansion started successively from lower to upper parts of each aborted tap root, and some lateral roots occurred simultaneously at several decades after tree establishment. The process of root system development was likely to be primarily linked with post-fire dynamics of rhizosphere environment of the permafrost soils.

    DOI: 10.1023/A:1026175718177

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Factors affecting seedling recruitment and survivorship of the Japanese subalpine stone pine, Pinus pumila, after seed dispersal by nutcrackers

    T Kajimoto

    ECOLOGICAL RESEARCH   17 ( 4 )   481 - 491   2002.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER TOKYO  

    To clarify the factors affecting the seedling establishment of the subalpine stone pine (Pinus pumila Regl.) from nutcracker-cached seeds, subsequently emerged seedlings were examined in two plots on Mt Akitakomagadake, northern Japan. The survivorship of older seedlings (2-20 years old) was also monitored during six seasons at nine different sites. In one plot with 18 caches, seed germination occurred between June and mid-July. During this period, nutcracker&apos;s retrieved the stored pine seeds from 16 caches and ate some seeds immediately. Simultaneously, this nutcracker behavior caused mechanical damage to newly emerging seedlings (e.g. uprooting and tearing off cotyledons). Such initial loss to in situ harvesting and mechanical damage accounted for 75% of the total seeds remaining in the caches. The number of established current seedlings sharply declined during the first 2 years, and the survival rate was 4.4% over four winters. Two major mortality factors were identified: uprooting by frost-heave soil disturbance in the spring of the second year and standing death by drought or other physiological stresses in early summer. In another plot with 13 caches, survivorship of newly emerged seedlings was also low (4.2%), but mortality was mostly due to summer drought, indicating that the frost-heave event was a site-specific disturbance factor. For older seedlings, survival rates reached approximately 90% even after six seasons and summer drought stress was a major mortality factor. My findings suggest that seedling recruitment of P. pumila was largely limited by both nutcracker disturbance and external disturbance (and/or stresses) at an early stage. However, after the critical first few years, pine seedlings were highly likely to survive and grow to the sapling stage despite the harsh environment of the high mountains.

    DOI: 10.1046/j.1440-1703.2002.00505.x

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Paleoclimatic implication of buried peat layers in a subalpine snowpatch grassland on Mt. Zarumori, northern Japan Reviewed

    H Daimaru, Y Ohtani, S Ikeda, T Okamoto, T Kajimoto

    CATENA   48 ( 1-2 )   53 - 65   2002.6

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We reconstruct the paleoclimatic background of buried peat layers formed around the 10th century, which occur in a snowpatch grassland in a snowy mountain in northern Japan. In the snowpatch grassland, peat accumulation is presently restricted by the presence of a summer snowpatch. Thus, the buried peat layers imply that the summer snowpatch around the 10th century was smaller than it has been in recent times. Climatic control of the year-to-year variation of the present snowpatch was examined based on a snowpatch survey and analysis of meteorological data. The observed snowpatch profiles suggested that winter wind speed played an important role in controlling summer snowpatch size. The buried peat layers indicate not only warming in the melt season, but also a possible weakened winter monsoon in the Medieval Warm Period. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0341-8162(02)00009-7

    Web of Science

    J-GLOBAL

    researchmap

  • Effects of snowfall fluctuation on tree growth and establishment of subalpine Abies mariesii near upper forest-limit of Mt. Yumori, northern Japan

    Takuya Kajimoto, Takeshi Seki, Shigeto Ikeda, Hiromu Daimaru, Toru Okamoto, Hiromichi Onodera

    Arctic, Antarctic, and Alpine Research   34 ( 2 )   191 - 200   2002

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Arctic and Alpine Research  

    We examined effects of annual snowfall fluctuation on tree growth and establishment in a mature stand (ca. 200 yr old) of Japanese subalpine Abies mariesii Mast. near upper forest-limits at leeward site. Relatively tall and aged fir trees (&gt
    5 m, &gt
    100 yr old) retained various scars of past mechanical damage due to snow pressures, e.g., multiple-, tip dieback- and broken-stems, and canopy anomaly. Ring-width pattern analysis showed that these deformed trees mostly experienced abrupt growth reduction. Some events of such abrupt growth reduction occurred simultaneously just after winters with heavy snowfall (e.g., mid-1960s), indicating that the A. mariesii trees often suffered from snow damage due to settlement force of excess snowpack. Particularly, in snowy winters, mechanical breakage of branches was likely to occur intensively at the height of 1 to 3 m above the maximum snowpack level of normal snowfall winters (ca. 3 m). On the other hand, some aged, but suppressed, trees sharply enhanced their growth rates simultaneously after such period of the intensive snow damage. This indicated that the snow damage upon the relatively tall trees sometimes facilitated regeneration of nearby shaded-trees by creating small-scale gaps. The snow-induced disturbance events may have occurred at about 10-yr intervals during the last half of 20th century. Our findings suggested that population dynamics of A. mariesii near its upper forest-limit, especially located at leeward and snowy site, was closely affected by the repetitive events of snow damage following snowy winters: the event primarily acted as a major limiting factor for canopy development of individuals, and sometimes triggered growth of suppressed-trees.

    DOI: 10.2307/1552471

    Scopus

    researchmap

  • Feasibility of estimating total stem volume and aboveground biomass from measurement on the largest trees in even-aged pure stands

    A. Osawa, A. P. Abaimov, T. Kajimoto

    Canadian Journal of Forest Research   31 ( 11 )   2042 - 2048   2001

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:National Research Council of Canada  

    Feasibility was tested of estimating the total stem volume and aboveground biomass from data of only the largest trees in even-aged pure stands. We applied a method of fitting a size-distribution function to data that exclude information of smaller individuals in a stand and compared the predicted stem volume and aboveground biomass with those calculated with data of all living trees in the stand. The paired t test showed that the predicted values of the total stem volume and aboveground biomass were not different (p = 0.05) from those observed even if only the largest 10% of the trees were used for estimation with the -3/2 power distribution. Results were similar with the beta-type distribution
    however, data from at least the largest 30% of the trees in the stand must be included. Absolute values of the relative error of the predicted total stem volume or aboveground biomass were generally in the range 10-20%, indicating that the present method is accurate enough to be used for calculation of these variables. However, there is systematic bias in the predictions of the total stem volume and aboveground biomass of a stand. Possible causes of the indicated biases and potential ways for improvement of the predictions were discussed.

    DOI: 10.1139/x01-137

    Scopus

    J-GLOBAL

    researchmap

  • Low frequency full depth snow avalanches on landslides in the Hachimantai Area, northern Japan

    DAIMARU Hiromu, KAJIMOTO Takuya, ONODERA Hiromichi, OKAMOTO Toru, SEKI Takeshi

    Journal of the Japanese Association of Snow and Ice   62 ( 5 )   463 - 471   2000.9

     More details

    Language:Japanese   Publisher:The Japanese Society of Snow and Ice  

    1999年4月21日, 岩手県岩手郡松尾村籐七温泉付近の斜面で幅約100m長さ約300mの全層雪崩が発生した.雪崩が発生した斜面は谷地形の発達が悪い地すべり滑落崖で, アバランチシュートなどの常習的な雪崩の発生を示唆する地形は見られなかった.この雪崩は発生斜面における雪食地の拡大と堆積地における亜高山帯林の破壊という景観変化を伴っていた.空中写真判読と現地調査の結果, 同様の景観変化は八幡平の稜線部の鏡沼付近においても, 1986年頃に起きたことが明らかになった.これまで雪崩災害の報告が少かった八幡平地域においても, 頻度は低いものの比較的大規模な全層雪崩が発生していると考えられる.

    DOI: 10.5331/seppyo.62.463

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • Above- and belowground biomass and net primary productivity of a Larix gmelinii stand near Tura, central Siberia

    T Kajimoto, Y Matsuura, MA Sofronov, AV Volokitina, S Mori, A Osawa, AP Abaimov

    TREE PHYSIOLOGY   19 ( 12 )   815 - 822   1999.10

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS  

    We assessed above- and belowground biomass and net primary production (NPP) of a mature Larix gmelinii (Rupr.) Rupr. forest (240-280 years old) established on permafrost soils in central Siberia. Specifically, we investigated annual carbon budgets in roots in relation to root system development and availability of soil resources. Total stand biomass estimated by allometry was about 39 Mg ha(-1). Root biomass (17 Mg ha(-1)) comprised about 43% of total biomass. Coarse root (greater than or equal to 5 mm in diameter) biomass was about twice that of fine roots (&lt; 5 mm). The aboveground biomass/root biomass ratio (T/R) of the larch stand was about unity, which is much less than that of other boreal and subalpine conifer forests. The proportion of fine roots in total root biomass (35%) was relatively high compared with other cold-climate evergreen conifer forests. Total NPP, defined as the sum of annual biomass increment of woody parts and needle biomass, was estimated to be 1.8 Mg ha(-1) year(-1). Allocation of total NPP to needle production was 56%. The proportion of total NPP in belowground production (27%) was less than for evergreen taiga forests. However, belowground NPP was probablyunderestimatedbecauserootmortalitywasexcluded.We conclude that L. gmelinii trees invested annual carbon gains largely into needle production or roots, or both, at the expense of growth of aboveground woody parts. This carbon allocation pattern, which resulted in the construction of exploitative root networks, appeared to be a positive growth response to the nutrient-poor permafrost soil of central Siberia.

    Web of Science

    Scopus

    researchmap

  • Seedling establishment of subalpine stone pine (Pinus pumila) by nutcracker (Nucifraga) seed dispersal on Mt. Yumori, northern Japan

    T Kajimoto, H Onodera, S Ikeda, H Daimaru, T Seki

    ARCTIC AND ALPINE RESEARCH   30 ( 4 )   408 - 417   1998.11

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:INST ARCTIC ALPINE RES  

    Seedling establishment of Japanese stone pine, Pinus pumila, primarily depends on seed dispersal by Japanese nutcrackers (Nucifraga caryocatactes var, japonica). To assess how this mode of seed dispersal affects regeneration and habitat expansion of P. pumila, we mode held observations concerning foraging behavior of nutcrackers, past annual production of pine cones, and age structure of established pine seedlings. Nutcrackers used various microsites for feeding and removing the pine seeds, especially on bare ground or around rocks. The pine seedlings occurred mainly in open patches sparsely covered with dwarf woody shrubs in wind-exposed sites, suggested that the nutcrackers preferred such open patches for caching. Age structure of the seedlings (&lt;20 yr old) showed a clumped age distribution. Most of the younger pine seedlings (&lt;10 yr old) grew as clusters, averaging four to five in number per cluster. Past cone production, estimated using a cone scar technique, varied annually, with some remarkable poor-crop years during the recent 12 yr. However, extensive recruitment of the pine seedlings did not necessarily follow a mast year. Fluctuation of the seedling recruitment was closely related to annual changes in early summer precipitation rather than air-temperature, indicating positive effect of water supply on seed germination. Our findings suggested that regeneration success of P. pumila was limited for two reasons: (1) spatially due to site preference of nutcrackers for seed caching, i.e., open patches at windy sites near the seed source of mature pine scrubs; and (2) temporally by annual fluctuation in climatic factors, especially soil moisture availability. Consequently, nutcrackers do not seem to help the pines expand more widely in the Japanese subalpine region.

    Web of Science

    Scopus

    researchmap

  • Evidence for snow patch shrinkage in the Medieval Warm Period, on Mt. Zarumori, Oou Mountains, northeastern Japan Part1 : Age, distribution and depositional environment of the buried peat layers

    DAIMARU Hiromu, IKEDA Shigeto, SAITO Takeshi, KAJIMOTO Takuya, OKAMOTO Toru, SEKI Takeshi

    Journal of the Japanese Association of Snow and Ice   59 ( 2 )   101 - 110   1997.4

     More details

    Language:Japanese   Publisher:The Japanese Society of Snow and Ice  

    This study shows the use of subalpine meadow soil stratigraphy to establish the time of disappearance of past snow patches. Growth periods of plants are too short in places where the snow disappears late in the season, such as at the centers of snow patches. Therefore, plant growth and the subsequent increase of organic content in the soil will indicate the disappearance of snow patches in early summer. Key tephras indicated that a series of buried peat layers on Mt. Zarumori in northeastern Japan accumulated after ca. 1200 yBP, and were buried after 915 AD, showing that the organic content in the surface soil increased ca. 1000yBP. The increase in carbon content probably indicates an increase in litter and stable surface condition. This was likely due to an early snow disappearance and longer snow-free period during the Medieval Warm Period. Snow disappearance before mid July is needed for the formation of buried peat, thus the buried peat layers on Mt. Zarumori probably indicate that the size of summer snow patch in 1000 yBP was smaller than those of recent snow patches.

    DOI: 10.5331/seppyo.59.101

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • Annual changes of basal bending and the process of snow damage of understory trees in a two-storied type and three strip-cut types of sugi (Cryptomeria japonica D. DON) stands in a heavy snow-fall area Reviewed

    H. Onodera, H. Tanabe, T. Kajimoto, H. Oohara, T. Kurita

    Nihon Ringakkai Shi/Journal of the Japanese Forestry Society   78 ( 1 )   61 - 65   1996.12

     More details

    Language:Japanese   Publisher:Japanese Forestry Society  

    To clarify the influences of snow depth on the development of basal bending, the growth of tree heights and the breaking process of snow damage to understory trees in a two-storied type and three strip-cut types (strip widths of 10, 15, and 20 m) sugi (Cryptomeria japonica D. DON) stands cut in 1974 in a heavy snow-fall area, a monitoring investigation was made. The mean value of snow depth in a 20 m wide stand was the largest, followed by the two-stried stand, the 15 m wide stand, and the 10 m wide stand. It was confirmed that the stage of development of basal bending kept up with the growth of tree heights. It also was confirmed that basal bending and the growth of tree heights were much influenced by the annual changes of snow depth. The mean values of tree heights and basal bendings were large in the order of the 20 m wide stand, the 15 m wide stand, the 10 m wide stand, and the two-storied stand. The snow damage by the basal splitting of tree trunks occurred to several individuals in the 20 m wide stand, and it became clear that the annual rate of increase for basal bending of such individuals was well above the average rate of the stand. It became clear that partially heavy snow covered areas were formed by extreme snow drifting in the strip cut stand, and that this was the cause of the outbreak of snow damage.

    DOI: 10.11519/jjfs1953.78.1_61

    Scopus

    CiNii Article

    CiNii Books

    researchmap

  • Annual changes of basal bending and the process of snow damage of understory trees in a two-storied type and three strip-cut types of sugi (Cryptomeria japonica D.DON) stands in a heavy snow-fall area.

    ONODERA H, TANABE H, KAJIMOTO T, OOHARA H, KURITA T

    Journal of the Japanese Forestry Society   78 ( 1 )   61 - 65   1996.2

     More details

    Language:Japanese   Publisher:一般社団法人日本森林学会  

    To clarify the influences of snow depth on the development of basal bending, the growth of tree heights and the breaking process of snow damage to understory trees in a two-storied type and three strip-cut types (strip widths of 10, 15, and 20m) sugi (Cryptomeria japonica D.DON) stands cut in 1974 in a heavy snow-fall area, a monitoring investigation was made. The mean value of snow depth in a 20m wide stand was the largest, followed by the two-stried stand, the 15m wide stand, and the 10m wide stand. It was confirmed that the stage of development of basal bending kept up with the growth of tree heights. It also was confirmed that basal bending and the growth of tree heights were much influenced by the annual changes of snow depth. The mean values of tree heights and basal bendings were large in the order of the 20m wide stand, the 15m wide stand, the 10m wide stand, and the two-storied stand. The snow damage by the basal splitting of tree trunks occurred to several individuals in the 20m wide stand, and it became clear that the annual rate of increase for basal bending of such individuals was well above the average rate of the stand. It became clear that partially heavy snow covered areas were formed by extreme snow drifting in the strip cut stand, and that this was the cause of the outbreak of snow damage.

    DOI: 10.11519/jjfs1953.78.1_61

    CiNii Article

    CiNii Books

    researchmap

  • Snow dynamics and ecological characteristics of trees on snowy mountain slope

    ONODERA Hiromichi, TANABE Hiromi, KAJIMOTO Takuya, DAIMARU Hiromu

    Japanese journal of forest environment   37 ( 2 )   59 - 66   1995.12

     More details

    Language:Japanese   Publisher:森林立地学会  

    This study discussed the relationship between snow dynamics and ecological characteristics of trees on the snowy slope of Mt. Yakeishi, central the Oou mountain range, north east Honsyu, Japan. Most of dwarf-type formed deciduous broad leaved trees dominated on the lee ward slope against the winter seasonal wind. The snow folds and snow cracks caused by glide of snow cover extended over a wide area of the lee ward slope and also the debris of full-depth snow avalanches were observed at places. And the scars caused by the snow erosion distributed in the slope. On the other hand, numbers of pit and mound formations caused by uprooting of middle or large size stands were observed on the wind ward slope and the longitudinal shape of the slope showed uneven feature like a staircase. While the dominant tree species on the lee ward slope were Alnus pendula, Weigela hortensis, Fugus crenata and others, those on the wind ward slope were Fugus crenata, Hamamelis japonica var. obutusata, Acer japonicum and others. The stands on the lee ward slope were extremly small in the size and showed the groundlinglike form which had extraordinary large basal bending width in contrast to those on the wind ward slope. The basal bending width varied with each tree species and that of higher ranking dominant tree species was larger on the lee ward slope and smaller on the wind ward slope. It seems advantegeous to the tree species to adapt for the creep and glide pressure of snow on the lee ward slope and to adapt for the settlement force of snow on the wind ward slope for the survival of individuals. Fagus crenata dominated on the both slopes seems to be the species of high snow tolelance capacity adapted to the snow environment which excelled in the settlement force rather than the creep and glide pressur of snow cover. The regeneration style of the stand growing on the snowy slope depend chiefly upon sproutings on the lee ward slope while seedlings on the wind ward slope. The ecological characteristics of trees above mentioned are the reflex of the difference of snow environment, and not only the depth of snow but also the qualitative aspect of snow such as the variety of metamorphic process and the snow dynamics such as glide and avalanches play an important role in the snow environmental factor which affect the distribution of community.

    DOI: 10.18922/jjfe.37.2_59

    CiNii Article

    CiNii Books

    researchmap

  • Ecological characteristics of Pinus pumila with special reference to dry matter production and regeneration

    T. Kajimoto

    Japanese Journal of Ecology   45 ( 1 )   57 - 72   1995.12

     More details

    Language:Japanese   Publisher:日本生態学会  

    P. pumila grows in alpine regions from central Japan to E Siberia and generally forms dwarf scrub. The ecological features of P. pumila were reviewed, focusing especially on its dry matter production and process of regeneration. Based on the annual above-ground net production and gross production of the pine forest, the carbon allocation pattern and efficiency of energy fixation were discussed. The reproduction style of P. pumila is characterized by two different phases: seedling establishment as a result of seed dispersal by nutcrackers, and regeneration by layering in the mature trees. -from English summary

    DOI: 10.18960/seitai.45.1_57

    Scopus

    CiNii Article

    CiNii Books

    researchmap

  • ABOVEGROUND NET PRODUCTION AND DRY-MATTER ALLOCATION OF PINUS-PUMILA FORESTS IN THE KISO MOUNTAIN-RANGE, CENTRAL JAPAN

    T KAJIMOTO

    ECOLOGICAL RESEARCH   9 ( 2 )   193 - 204   1994.8

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:BLACKWELL SCIENCE  

    Aboveground net production rates of the subalpine stone pine (Pinus pumila) forests in central Japan were estimated by the summation method; net production was defined as the sum of annual biomass increment and annual loss due to death. In the two pine stands of different scrub heights, P1 (200 cm) and P2 (140 cm), aboveground biomass reached 177 and 126 ton ha-1, respectively. Leaf biomass was about 14 ton ha-1 in each stand. The estimates of aboveground net production during the 2 year period (1987-1989) averaged 4.1 and 3.7 ton ha-1 y-1 in P1 and P2, respectively, which were at the lowest among the pine forests in the world. Two indices of efficiency of energy fixation, that is, the ratio of net production to the total radiation during a growing season and the ratio of net production to total radiation per unit of leaf weight, were evaluated. Both efficiency indices for the two P. pumila stands fell in the range obtained for other Japanese evergreen conifer forests. This suggested that the low annual net production of the stone pine stands were mainly due to a limitation in the length of the growing season. The pine forests were also characterized by a small allocation (about 17%) of aboveground net production into biomass increment, in comparison with other evergreen conifer forest types. Annual net carbon gain in the P. pumila forests was suggested to be largely invested in leaf production at the expense of the growth of woody parts.

    DOI: 10.1007/BF02347495

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • SHOOT DYNAMICS OF PINUS-PUMILA IN RELATION TO ALTITUDINAL AND WIND EXPOSURE GRADIENTS ON THE KISO MOUNTAIN-RANGE, CENTRAL JAPAN Reviewed

    T KAJIMOTO

    TREE PHYSIOLOGY   13 ( 1 )   41 - 53   1993.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:HERON PUBLISHING  

    Seasonal shoot dynamics of Japanese mountain stone pine (Pinus pumila Regel.) growing at six sites with different altitudes and slope aspects on the Kiso mountain range in central Japan were investigated. The shoots followed a similar growth pattern at all sites; current shoots elongated rapidly during June and July, and the current needles grew during July and August. Final lengths of the current shoots and needles decreased with increasing altitude. Current-shoot lengths were also shorter at the windward sites than at the leeward sites. At all sites, leaf senescence occurred intensively between mid-August and mid-September. Needle longevity, i.e., the age of the oldest living needle attached to a shoot, increased with increasing altitude. Fascicle density, i.e., the number of current needle fascicles on a unit shoot length, was greater at higher altitudes and windward sites than at lower altitudes and leeward sites.
    Seasonal dynamics of the P. pumila shoots were characterized by simultaneous replacement of old needles with new needles in the early autumn, thus avoiding any loss of canopy photosynthetic production during the growing season. Increases in needle longevity and fascicle density were associated with declining air temperature and increasing wind exposure. Needle longevity and fascicle density were characteristics of adaptive plasticity in P. pumila that prevent a reduction in growth potential in the stressful conditions of alpine regions.

    DOI: 10.1093/treephys/13.1.41

    Web of Science

    researchmap

  • DYNAMICS AND DRY-MATTER PRODUCTION OF BELOWGROUND WOODY ORGANS OF PINUS-PUMILA TREES GROWING ON THE KISO MOUNTAIN-RANGE IN CENTRAL JAPAN Reviewed

    T KAJIMOTO

    ECOLOGICAL RESEARCH   7 ( 3 )   333 - 339   1992.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:BLACKWELL SCIENCE  

    Size, biomass and spatial distribution patterns of belowground woody organs of Pinus pumila trees were investigated. Dry weight estimates of five sample trees were between 14 and 36 kg tree-1. Belowground stems accounted for about 3 2 % of the total tree weight. However, the belowground stems had extensive barkless portions, indicating that the decomposition of dead belowground stems was an important source of organic matter in the soil. The basal diameters of adventitious roots tended to become smaller as their orginating positions neared the ground surface. It was suggested that P. pumila trees regenerate by successively producing adventitious roots from their buried stems and moving down the slope.

    DOI: 10.1007/BF02347100

    Web of Science

    Scopus

    J-GLOBAL

    researchmap

  • Photosynthesis and respiration of Pinus pumila needles in relation to needle age and season

    Takuya Kajimoto

    Ecological Research   5 ( 3 )   333 - 340   1990.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer-Verlag  

    Rates of net photosynthesis and dark respiration were measured for detached needles of Pinus pumila trees growing on the Kiso mountain range in central Japan in 1987. Dependency of photosynthesis on light and temperature was examined in relation to needle age and season. The light saturation point of net photosynthesis was lower in 3- and 4-yr-old needles than that in current (flushed in 1987), 1- and 2-yr-old needles. Pnmax, net photosynthetic rates at 1000 μmol m-2 s-1 and 15°C, of needles from 1- to 4-yr-old generally decreased with needle age. Pnmax of 1- to 4-yr-old needles became higher in August than in other months, and Pnmax of current needles did so in September. Current needles showed high respiration rates (at 15°C) only in August. Optimum air temperatures for net photosynthesis at 1000 μmol m-2 s-1 were between 10 and 15°C for current and 1-yr-old needles. The temperature coefficient of dark respiration rates was 2.3-3.3 for current needles from August to October, and 2.2 for 1-yr-old needles in mid-July. © 1990 the Ecological Society of Japan.

    DOI: 10.1007/BF02347008

    Scopus

    J-GLOBAL

    researchmap

  • Aboveground biomass and litterfall of Pinus pumila scrubs growing on the Kiso mountain range in central Japan

    Takuya Kajimoto

    Ecological Research   4 ( 1 )   55 - 69   1989.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer-Verlag  

    Aboveground biomass and litterfall of Pinus pumila scrubs, growing on the Kiso mountain range in central Japan, were investigated from 1984 to 1985. The biomass of two research plots (P1 and P2) with different scrub heights was estimated by two methods, the stratified clip technique and the allometric method. Aboveground total biomass estimated by the latter method reached 181 ton d.w. ha-1 in P1 and 132 ton d.w. ha-1 in P2. Creeping stems contributed to about half of the total biomass. Although estimates of woody organs differed between the two plots, leaf biomass estimates were almost the same at 15.5 ton d.w. ha-1. The canopies of the two P. pumila scrubs were characterized by a large mean leaf area density of 5.0 m2 m-3. Despite this large area density, relatively moderate attenuation of light intensity was observed. Specific leaf area generally increased with reduced leaf height. Annual total litterfall was estimated to be 3.60 ton d.w. ha-1 yr-1 in P1 and 2.39 ton d.w. ha-1 yr-1 in P2. Annual leaf fall in both plots was approximately 2.0 ton d.w. ha-1 yr-1. Leaves fell mainly in early autumn. Annual loss rates of branches, estimated as the sum of annual branch litterfall and the amount of newly formed attached dead branches, were 0.29 ton d.w. ha-1 yr-1 in P1 and 0.37 ton d.w. ha-1 yr-1 in P2. © 1989 Ecological Society of Japan.

    DOI: 10.1007/BF02346943

    Scopus

    researchmap

▶ display all

Books

  • 生物学者、地球を行く (日本生態学会北海道地区会編)

    梶本 卓也

    文一総合出版  2018.4 

     More details

  • 陸域生態系の炭素動態 -地球環境へのシステムアプローチ- (及川武久・山本晋編著)

    松浦陽次郎, 梶本卓也

    京都大学学術出版会  2013 

     More details

  • Permafrost ecosystems : Siberian larch forests

    Osawa A, Zyryanova OA, Matsuura Y, Kajimoto T, Wein RW( Role: Joint editor)

    Springer  2010  ( ISBN:9781402096921

     More details

    Language:English

    CiNii Books

    researchmap

  • 生物学大辞典

    梶本 卓也

    東京化学同人  2010 

     More details

  • 森林大百科事典

    梶本 卓也

    朝倉書店  2009 

     More details

  • 生態学入門(日本生態学会編)

    梶本 卓也

    東京化学同人  2004 

     More details

  • 雪山の生態学 : 東北の山と森から

    梶本 卓也, 大丸 裕武, 杉田 久志

    東海大学出版会  2002  ( ISBN:4486015746

     More details

    Language:Japanese

    CiNii Books

    researchmap

  • 高山植物の自然史 ~お花畑の生態学(工藤岳編著)

    梶本 卓也

    北大図書刊行会  2000 

     More details

  • 東北の森-科学の散歩道

    梶本 卓也

    森林総合研究所東北支所編  2000 

     More details

▶ display all

MISC

  • アマゾン熱帯林で持続的な択伐施業の可能性を検証する

    大谷達也, 梶本卓也, 大橋伸太, 諏訪錬平

    森林総合研究所研究成果選集   2019   14‐15   2019.7

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 森林の放射性セシウムは事故からの5年間で土壌表層に移動した

    金子真司, 今村直広, 小松雅史, 大橋伸太, 橋本昌司, 梶本卓也, 高野勉

    森林総合研究所研究成果選集   2018   10‐11   2018.7

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 土壌から樹体への放射性セシウムの移行吸収-ヒノキ苗植栽後3年間の動態-

    平井敬三, 小松雅史, 長倉淳子, 野口享太郎, 斎藤哲, 大橋伸太, 川崎達郎, 今村直広, 矢崎健一, 山田毅, 池田重人, 金指努, 荒木眞岳, 梶本卓也, 竹中篤史, 新家武

    日本土壌肥料学会講演要旨集   64   2018

  • A database system about study sites of containerized tree seedling planting in Japan

    16 ( 3 )   147 - 153   2017.9

     More details

  • キャビティ容量の異なるスギコンテナ苗の灌水停止後の水ポテンシャルの変化

    飛田博順, 山下直子, 宇都木玄, 奥田史郎, LEI Thomas Ting, 矢崎健一, 梶本卓也

    日本森林学会大会学術講演集   128th   247   2017.3

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 再造林とコンテナ苗の活用 -最近の実証研究事例からみた現状と今後の課題

    梶本卓也

    山林   1594 ( 1594 )   2 - 10   2017.3

     More details

    Language:Japanese   Publisher:大日本山林会  

    CiNii Article

    CiNii Books

    researchmap

  • 森林モニタリングサイトにおける放射性セシウム蓄積量の時系列変化および空間分布

    今村直広, 金子真司, 大橋伸太, 鈴木養樹, 梶本卓也, 齋藤哲, 三浦覚, 池田重人, 川崎達郎, 荒木眞岳, 小松雅史, 壁谷大介, 藤原健, 小林政広, 赤間亮夫

    日本森林学会大会学術講演集   128th   2017

  • ブラジル・中央アマゾンの択伐林におけるバイオマスの回復

    大谷達也, ドリアーノ・リマ, 諏訪錬平, 大橋伸太, 梶本卓也, ニーロ・ヒグチ

    海外の森林と林業   96   16 - 21   2016.10

     More details

  • ブラジル・中央アマゾンでの年輪検出の試み-材の酸素・炭素安定同位体比に季節変化はあるか-

    大橋伸太, フラビア・ドゥルガンチ, 香川聡, 梶本卓也, スーザン・トランボア, シャオメイ・シュウ, 石塚森吉, ニーロ・ヒグチ

    海外の森林と林業   97   38 - 42   2016.10

     More details

  • 低コスト再造林の実現にコンテナ苗をどう活用するか:研究の現状と今後の課題

    梶本卓也, 宇都木玄, 田中浩

    日本森林学会誌   98   135 - 138   2016.4

  • プロジェクト「コンテナ苗を活用した低コスト再造林技術の実証研究」の紹介

    梶本卓也, 宇都木玄

    森林遺伝育種(Web)   5 ( 2 )   101‐105 (WEB ONLY)   2016.4

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • ヒノキコンテナ苗の葉の水分状態および木部水分通導に対する摘葉の効果

    飛田博順, 小笠真由美, 山下直子, LEI Thomas T, 諏訪錬平, 奥田史郎, 矢崎健一, 北尾光俊, 宇都木玄, 梶本卓也

    日本森林学会大会学術講演集   127th   245 - 497   2016.3

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_497

    CiNii Article

    J-GLOBAL

    researchmap

  • 異なる摘葉処理をしたヒノキコンテナ苗における葉の乾燥耐性と生理的応答

    山下直子, 飛田博順, LEI Thomas Ting, 小笠真由美, 諏訪錬平, 奥田史郎, 矢崎健一, 北尾光俊, 宇都木玄, 梶本卓也

    日本森林学会大会学術講演集   127th   246 - 498   2016.3

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_498

    CiNii Article

    J-GLOBAL

    researchmap

  • 福島原発事故で汚染された森林における様々な樹木種の放射性セシウム濃度

    田中憲蔵, 梶本卓也, 齊藤哲, 川崎達郎, 小松雅史, 壁谷大介, 矢崎健一, 太田敬之, 田淵隆一, 松本陽介, 宇都木玄, 酒井武, 飛田博順, 伊東宏樹, 大橋伸太, 高野勉, 赤間亮夫, 高橋正通

    関東森林研究   67   45 - 48   2016.3

     More details

  • Preface "Introduction to special issue: Possibility of container seedlings for establishing a low-cost reforestation system in Japanese forestry: Recent findings and future perspectives"

    Takuya Kajimoto, Hajime Utsugi, Hiroshi Tanaka

    Nihon Ringakkai Shi/Journal of the Japanese Forestry Society   98   135 - 138   2016.1

     More details

  • The performance of containerized tree seedlings after outplantings evaluated from multi-site data set

    Daisuke Kabeya, Hajime Utsugi, Kazuto Kita, Akira Ogura, Naofumi Watanabe, Kohei Fujimoto, Makoto Yamazaki, Tadayuki Yashiro, Takuya Kajimoto, Hiroshi Tanaka

    Nihon Ringakkai Shi/Journal of the Japanese Forestry Society   98   214 - 222   2016.1

     More details

    Containerized tree seedlings are expected to exhibit high survivorship and good growth after outplanting; however, a unified consensus on the performance of containerized seedlings in Japan remains undetermined. To understand the universal properties of the performances of containerized seedlings after outplanting, the survival ratio and height and diameter growth rate of two stock types (containerized seedlings and bare-root seedlings) were estimated from 39 experiment sites covering five prefectures and five species and compared between stock types. The result of parameter estimation using hierarchal Bayesian models revealed that the median survival ratio of containerized seedlings across all species was 0. 96, which was not different from that of bare-root seedlings (0. 97). The estimated height and diameter growth rates were also similar between stock types. The sturdiness quotient (SQ, the ratio of height and diameter) was higher in containerized seedlings than in bare-root seedlings of all species immediately after outplanting. However, the difference in SQ between stock types diminished 1 year after outplanting. These results suggest that containerized tree seedlings generally show performances equivalent to those of bare-root seedlings after outplanting. Therefore, other properties of containerized seedlings, such as ease of cultivation and low-labor planting present more attractive advantages than those of good performance after outplanting.

    Scopus

    researchmap

  • セシウムは森林土壌のどこに存在しているか

    金子真司, 赤間亮夫, 高野勉, 小林政広, 石塚成宏, 橋本昌司, 志知幸治, 大貫靖浩, 鳥山淳平, 釣田竜也, 平井敬三, 阪田匡司, 山田毅, 野口享太郎, 古澤仁美, 池田重人, 小野賢二, 藤井一至, 大橋伸太, 齊藤哲, 小松雅史, 梶本卓也

    日本森林学会大会学術講演集   127th   2016

  • 添畑沢スギ間伐試験地における45年生から104年生までの長期成長データ

    正木隆, 大住克博, 関剛, 森茂太, 梶本卓也, 櫃間岳, 八木橋勉, 柴田銃江, 野口麻穂子

    森林総研報   433   65 - 72   2015.3

     More details

  • スギ樹冠内の針葉の窒素含量と光合成パラメータの関係 Reviewed

    飛田博順, 北尾光俊, 齊藤哲, 壁谷大介, 川崎達郎, 矢崎健一, 小松雅史, 梶本卓也

    関東森林研究   66(1)   13 - 16   2015.3

     More details

  • 花粉症研究最前線 森林管理による花粉生産の抑制―間伐の可能性について

    KAJIMOTO TAKUYA, FUKUSHIMA SHIGEKI

    森林科学   ( 73 )   17 - 20   2015.2

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • スギ樹冠葉の冬季の光合成能力の評価

    飛田博順, 北尾光俊, 宇都木玄, 齊藤哲, 壁谷大介, 川崎達郎, 矢崎健一, 小松雅史, 梶本卓也

    日本森林学会大会学術講演集   126th   2015

  • Litterfall contribution to radiocesium dynamics in forest ecosystems

    Komatsu Masabumi, Inagaki Yoshiyuki, Miura Satoru, Kobayashi Masahiro, Kajimoto Takuya, Ikeda Shigeto, Kaneko Shinji

    The Japanese Forest Society Congress   126 ( 0 )   2015

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    CiNii Article

    researchmap

  • Guidance for methods assessing radiocesium dynamics in tree, wood, soil and stream water in forest ecosystems

    TAKAHASHI MASAMICHI, KAJIMOTO TAKUYA, TAKANO TSUTOMU, IKEDA SHIGETO, KOBAYASHI MASAHIRO

    森林総合研究所研究報告   13 ( 3 )   107 - 112   2014.9

     More details

  • ブラジル・アマゾンの森林炭素を測る

    KAJIMOTO TAKUYA, NOGUCHI HIDEYUKI, OHASHI NOBUTA, SATO TAMOTSU, IIDA SHIGEO, SUWA REMPEI, YAGIHASHI TSUTOMU, OTANI TATSUYA, ISHIZUKA MORIYOSHI, SAWADA HARUO, SAWADA YOSHITO, SHINDO KEIJI, ENDO TAKAHIRO

    森林総合研究所研究成果選集   2014   36 - 37   2014.7

     More details

    Language:Japanese  

    J-GLOBAL

    researchmap

  • 千葉県鴨川市のヒノキ高齢林における個体サイズと胸高直径成長量の関係 Reviewed

    福島成樹, 梶本卓也, 齊藤哲

    関東森林研究   65   303 - 306   2014.3

     More details

  • Study on Belowground Biomass in a Lowland Dipterocarp Forest, Peninsular Malaysia

    新山 馨, 松浦 陽次郎, 梶本 卓也

    水利科学   58 ( 5 )   104 - 120   2014

     More details

    Language:Japanese   Publisher:日本治山治水協会  

    DOI: 10.20820/suirikagaku.58.5_104

    CiNii Article

    CiNii Books

    researchmap

  • Temporal change of vertical distribution of 137 Cs in the forest soils in Fukushima Prefecture

    Kaneko Shinji, Ohnuki Yasuhiro, Fujii Kazumichi, Ono Kenji, Saito Satoshi, Kajimoto Takuya, Takano Tsutomu, Takahashi Masamichi, Akama Akio, Ikeda Shigeto, Miura Satoru, Komatsu Masafumi, Hirai Keizo, Shichi Kouji, Hashimoto Shoji, Inagaki YOshiyuki

    The Japanese Forest Society Congress   125 ( 0 )   396 - 396   2014

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.125.0_396

    CiNii Article

    researchmap

  • Possibility of controlling pollen production by thinning techniques in Japanese cedar plantation

    Kajimoto Takuya, Chiba Yukihiro, Kiyono Yoshiyuki, Fukushima Shigeki, Saito Satoshi, Kabeya Daisuke, Kawasaki Tatsuro, Igarashi Tetsuya, Okuda Shiro, Migita Chiharu, Han Chinmin

    The Japanese Forest Society Congress   125   87 - 87   2014

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.125.0_87

    CiNii Article

    researchmap

  • 8-1-2 福島県の森林内における放射性セシウムの沈着と分布の変化(8-1 環境保全,2013年度名古屋大会)

    高橋 正通, 金子 真司, 池田 重人, 三浦 覚, 赤間 亮夫, 清野 嘉之, 梶本 卓也, 齋藤 哲, 高野 勉

    日本土壌肥料学会講演要旨集   ( 59 )   150 - 150   2013.9

     More details

    Language:Japanese   Publisher:一般社団法人日本土壌肥料学会  

    CiNii Article

    CiNii Books

    researchmap

  • Report of the Study by International Joint Research Project on Carbon Dynamics of Amazonian Forests in Brazil (CADAF)

    梶本 卓也, 石塚 森吉

    海外の森林と林業   ( 86 )   3 - 8   2013.1

     More details

    Language:Japanese   Publisher:国際緑化推進センター  

    CiNii Article

    CiNii Books

    researchmap

  • スギ樹冠葉の光合成能力の季節変化

    飛田博順, 北尾光俊, 齊藤哲, 川崎達郎, 壁谷大介, 矢崎健一, 小松雅史, 梶本卓也

    日本生態学会大会講演要旨集   60th   2013

  • A Brief Overview of Research Program and Issues for the Forest Sectors in Bhutan (2) Information from a Forestry and Forest Ecosystem Seminar with the Renewable Natural Resources Research and Development Centre in Yusipang

    ( 83 )   9 - 14   2012.1

     More details

  • A brief overview of research program and issues in the Bhutan forest sectors: information from a Forestry and Forest Ecosystem Seminar with the Renewable Natural Resources Research and Development Centre in Yusipang

    後藤 忠男, 梶本 卓也, 大井 徹

    Japanese journal of international forest and forestry   ( 82 )   28 - 32   2011.9

     More details

    Language:Japanese   Publisher:国際緑化推進センター  

    CiNii Article

    CiNii Books

    researchmap

  • Management and pollen production in Japanese cedar plantation

    Kajimoto Takuya, Chiba Yukihiro, Kiyono Yoshiyuki, Fukushima Shigeki, Kanazashi Tatsuo, Saito Satoshi, Igarashi Tetsuya, Kawasaki Tatsuro, Migita Chiharu, Han Qingmin, Kabeya Daisuke

    The Japanese Forest Society Congress   123   Pa111 - Pa111   2011

     More details

    Language:Japanese   Publisher:THE JAPANESE FORESTRY SOCIETY  

    DOI: 10.11519/jfsc.123.0.Pa111.0

    CiNii Article

    researchmap

  • Comment on Akira Mori's review article

    KAJIMATO T.

    Japanese Journal of Ecology   60 ( 1 )   43 - 44   2010.3

     More details

    Language:Japanese   Publisher:The Ecological Society of Japan  

    CiNii Article

    CiNii Books

    researchmap

  • 23-29 中央シベリア永久凍土カラマツ林における土壌呼吸速度の季節変化(23.地球環境,2009年度京都大会)

    森下 智陽, 松浦 陽次郎, 梶本 卓也, 大澤 晃, 中井 裕一郎, Zyryanova Olga, Abaimov Anatoly

    日本土壌肥料学会講演要旨集   ( 55 )   194 - 194   2009.9

     More details

    Language:Japanese   Publisher:一般社団法人日本土壌肥料学会  

    CiNii Article

    CiNii Books

    researchmap

  • P5. Slope and fluvial landforms in Tura, Central Siberia(Abstracts of Papers Presented at the Fall Meeting of the Union, October 2005)

    DAIMARU Hiromu, MATSUURA Yojiro, KAJIMOTO Takuya, ABAIMOV Anatoly P.

    27 ( 1 )   110 - 111   2006

  • Interactions between Root System Development and Permafrost Soil Environments on Siberian Larch Forests (Extended Abstract)

    Takuya Kajimoto, Y Matsuura, A Osawa, A.P.Ab aimov, S.G.Pro kushkin, O.A.Zyr yanova, M.A.So fronov, A.V.Vol okitina, S Mori, T Koike

    The science reports of the Tohoku University. Fifth series, Tohoku geophysical journal   36 ( 4 )   479 - 483   2003.5

     More details

    Language:Japanese   Publisher:Faculty of Science, Tohoku University  

    CiNii Article

    CiNii Books

    researchmap

  • Snow pressure and the distribution of the Abies Mariesii forest in northeast Japan: A preliminary study using GIS

    DAIMARU Hiromu, SUGITA Hisashi, KAJIMOTO Takuya, SEKI Takeshi, TAODA Hiroshi

    59   186 - 186   2001

     More details

  • Vegetation and landforms in the snow avalanche tracks in the Hachimantai Area, northern Japan

    DAIMARU Hiromu, KAJIMOTO Takuya, ONODERA Hiromichi

    57   230 - 231   2000

     More details

  • Effects of external factors on growth and structure of Pinus pumila scrub in Mt. Kinpu, central Japan

    Kajimoto, T, Kurachi, N, Chiba, Y, Utsugi, H, Ishizuka, M

    Climate change and plants in East Aisa   149 - 156   1996

     More details

▶ display all

Awards

  • Japanese Forest Society Award

    2012.3  

    KAJIMOTO Takuya

     More details

  • Journal of Forest Research Award

    2011.3  

    Araki MG, Utsugi H, Kajimoto T, Han Q, Kawasaki T, Chiba Y

     More details

  • Ecological Research Award

    2003.3  

    KAJIMOTO Takuya

     More details

Research Projects

  • 優良苗の安定供給と下刈り省力化による一貫作業システム体系の開発

    2016 - 2018

    農研機構生研支援センター  地域戦略プロジェクト 

    梶本 卓也

      More details

    Authorship:Principal investigator  Grant type:Competitive

    researchmap

  • アマゾン熱帯林における低インパクト型択伐施業の可能性:樹種の成長特性に基づく検証

    2016 - 2018

    文科省  科研費基盤B 

    梶本 卓也

      More details

    Authorship:Principal investigator  Grant type:Competitive

    researchmap

  • 凍土深の変動が森林炭素蓄積量と林床構造・機能に及ぼす影響の評価

    2010 - 2013

    文科省  科研費基盤B 

    松浦陽次郎

      More details

    Grant type:Competitive

    researchmap

  • 温暖化適応策導出のための長期森林動態データを活用した東アジア森林生態系炭素収支観測ネットワークの構築

    2009 - 2013

    環境省  地球環境保全試験研究 

    佐藤 保

      More details

    Grant type:Competitive

    researchmap

  • シルビクロノロジー:過去の森林現存量増加速度の復元、変動要因解析、および将来予測

    2009 - 2012

    文科省  科研費・基盤B 

    大澤 晃

      More details

    Grant type:Competitive

    researchmap

  • 中央シベリア凍土地帯カラマツ林生態系の種多様性と生産力に関する研究

    2008 - 2009

    日本学術振興会  二国間交流・共同研究 

    梶本 卓也

      More details

    Authorship:Principal investigator  Grant type:Competitive

    researchmap

▶ display all

 

Teaching Experience

  • 基礎農林学実習

    2022
    Institution name:新潟大学

  • 森・里・海フィールド実習

    2022
    Institution name:新潟大学

  • 卒業論文

    2022
    Institution name:新潟大学

  • 森林生態学特論

    2022
    Institution name:新潟大学

  • フィールドワーカーのためのリスクマネジメント実習

    2022
    Institution name:新潟大学

  • 森林再生学

    2022
    Institution name:新潟大学

  • 育林系演習及び実習

    2022
    Institution name:新潟大学

  • 野生動植物生態学実習

    2022
    Institution name:新潟大学

  • 自然科学総論V

    2022
    Institution name:新潟大学

  • 生態系を知る

    2021
    Institution name:新潟大学

▶ display all