Updated on 2023/02/05

写真a

 
NAGANO Hirohiko
 
Organization
Academic Assembly Institute of Science and Technology NOUGAKU KEIRETSU Assistant Professor
Graduate School of Science and Technology Environmental Science and Technology Assistant Professor
Faculty of Agriculture Department of Agriculture Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士(農学) ( 2013.3 )

  • 修士(農学) ( 2009.3 )

Research Interests

  • Terrestrial ecosystem

  • Greenhouse gas

  • Biogeosciences

  • Forest

  • Microbiology

  • Soil

Research Areas

  • Life Science / Forest science

  • Natural Science / Atmospheric and hydrospheric sciences

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

Research History (researchmap)

  • Niigata University   Faculty of Agriculture   Assistant Professor

    2021.4

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  • Nagoya University   Institute for Space and Earth Environmental Research   Specially Appointed Assistant Professor

    2020.4 - 2021.3

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  • 日本原子力研究開発機構   原子力科学研究所   博士研究員

    2017.4 - 2020.3

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  • University of Alaska Fairbanks

    2012.4 - 2015.3

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    Country:United States

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  • Unversity of Alaska Fairbanks   International Arctic Research Center   Visiting Research Scholar

    2016.5 - 2016.10

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    Country:United States

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  • Chiba University   Graduate School of Horticulture

    2015.4 - 2016.3

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    Country:Japan

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Research History

  • Niigata University   Environmental Science and Technology, Institute of Science and Technology, Academic Assembly   Assistant Professor

    2021.4

  • Niigata University   Department of Agriculture, Faculty of Agriculture   Assistant Professor

    2021.4

  • Niigata University   Environmental Science and Technology, Graduate School of Science and Technology   Assistant Professor

    2021.4

Education

  • Chiba University   Graduate School of Horticulture

    2009.4 - 2013.3

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  • Tokyo University of Agriculture and Technology   Graduate School of Agriculture   Department of Environmental Science on Biosphere

    2007.4 - 2009.3

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  • Tokyo University of Agriculture and Technology   Faculty of Agriculture   Department of Environmental and Natural Resource Sciences

    2003.4 - 2007.3

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Professional Memberships

Committee Memberships

  •   Topic Editor in Remote Sensing (ISSN 2072-4292)  

    2020.8   

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    Committee type:Other

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Papers

  • Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances Reviewed

    Hirohiko Nagano, Ayumi Kotani, Hiroki Mizuochi, Kazuhito Ichii, Hironari Kanamori, Tetsuya Hiyama

    Environmental Research Letters   2022.1

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1748-9326/ac4884

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  • Soil microbial community responding to moderately elevated nitrogen deposition in a Japanese cool temperate forest surrounded by fertilized grasslands Reviewed

    Hirohiko Nagano, Masataka Nakayama, Genki Katata, Keitaro Fukushima, Takashi Yamaguchi, Makoto Watanabe, Toshiaki Kondo, Mariko Atarashi-Andoh, Tomohiro Kubota, Ryunosuke Tateno, Jun Koarashi

    Soil Science and Plant Nutrition   67 ( 5 )   606 - 616   2021.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    To examine the hypothesis that the soil microbial community in a nitrogen (N) limited forest responds to moderately elevated N deposition (< 10 kg ha(-1) yr(-1)), correlations between N deposition and soil microbial properties were analyzed in a cool temperate forest surrounded by normally fertilized pasture grasslands in northern Japan. Three experimental plots were established in forest edges adjacent to the grasslands, and the other three plots were in forest interiors at least 700 m away from the grasslands. N deposition in each plot was measured from May to November 2018. In August 2018, we collected litter and surface soil samples from all plots to measure net N mineralization and nitrification rates as indicators of microbial activity, and microbial biomass and various gene abundances (i.e., bacterial 16S rRNA gene, fungal ITS region, and bacterial and archaeal amoA genes) as indicators of microbial abundance. N deposition in forest edges was 1.4-fold greater than that in forest interiors, whereas maximum N deposition was 3.7 kg ha(-1). N deposition was significantly correlated with net N mineralization and nitrification rates and 16S rRNA and bacterial amoA gene abundances. Microbial community structures analyzed for bacterial 16S rRNA gene and fungal ITS region amplicons were different between litter and soil samples but were similar between the forest edge and interior, although this analysis was made only for single pair of the two plots in the forest edge and interior. N deposition was also correlated with the soil C/N ratio and nitrate and ammonium contents. Thus, it was suggested that some soil microbial activities and abundances in an N limited forest likely responded to moderately elevated N deposition. These findings provide primary information on soil microbial response to moderately elevated N deposition.

    DOI: 10.1080/00380768.2021.1974799

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  • Effect of dry-wet cycles on carbon dioxide release from two different volcanic ash soils in a Japanese temperate forest Reviewed

    Hirohiko Nagano, Mariko Atarashi-Andoh, Jun Koarashi

    Soil Science and Plant Nutrition   65 ( 5 )   525 - 533   2019.9

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/00380768.2019.1649976

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  • Laboratory examination of greenhouse gaseous and microbial dynamics during thawing of frozen soil core collected from a black spruce forest in Interior Alaska Reviewed

    Hirohiko Nagano, Yongwon Kim, Bang-Yong Lee, Haruka Shigeta, Kazuyuki Inubushi

    Soil Science and Plant Nutrition   64 ( 6 )   793 - 802   2018.11

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/00380768.2018.1525267

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  • Extremely dry environment down-regulates nighttime respiration of a black spruce forest in Interior Alaska Reviewed

    Hirohiko Nagano, Hiroki Ikawa, Taro Nakai, Miwa Matsushima-Yashima, Hideki Kobayashi, Yongwon Kim, Rikie Suzuki

    Agricultural and Forest Meteorology   249   297 - 309   2018.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier B.V.  

    In the face of increasing temperature at high latitudes, ecosystem respiration (RE) is a key to determining sink and source dynamics of a boreal forest. In this paper, we analyzed four-year RE data obtained in an open black spruce forest—a typical boreal forest ecosystem with permafrost in Interior Alaska. RE measured as nighttime CO2 effluxes for both the ecosystem and the forest floor were clearly situated along the exponential temperature-dependent curve, except for the data obtained in extremely dry conditions in mid-summer. More than 93 % of RE data measured at nighttime with high vapor pressure deficit (VPD &gt
    400 Pa) were lower than the values predicted from the temperature-dependent curve. Consequently, the year 2013 (with an unusually dry summer) had a 15 % lower amount of annual RE than that could be expected from the temperature-dependent curve without considering the effect of high VPD. The suppression of RE under dry conditions was also related to decreases in soil moisture and net ecosystem productivity. Finally, assuming daytime RE could be extrapolated from the temperature-dependent curves, annual daytime RE estimated with the effect of high VPD was decreased by up to 62% from RE estimated without the VPD effect. The down-regulation of RE presented in this study postulates a possible negative feedback for the carbon budget of boreal forests in response to climate warming.

    DOI: 10.1016/j.agrformet.2017.11.001

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  • Expansion of Agriculture in Northern Cold-Climate Regions: A Cross-Sectoral Perspective on Opportunities and Challenges Reviewed

    Adrian Unc, Daniel Altdorff, Evgeny Abakumov, Sina Adl, Snorri Baldursson, Michel Bechtold, Douglas J. Cattani, Les G. Firbank, Stéphanie Grand, María Guðjónsdóttir, Cynthia Kallenbach, Amana J. Kedir, Pengfei Li, David B. McKenzie, Debasmita Misra, Hirohiko Nagano, Deborah A. Neher, Jyrki Niemi, Maren Oelbermann, Jesper Overgård Lehmann, David Parsons, Sylvie Quideau, Anarmaa Sharkhuu, Bożena Smreczak, Jaana Sorvali, Jeremiah D. Vallotton, Joann K. Whalen, Erika H. Young, Mingchu Zhang, Nils Borchard

    Frontiers in Sustainable Food Systems   5   2021.7

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    Publishing type:Research paper (scientific journal)   Publisher:Frontiers Media SA  

    Agriculture in the boreal and Arctic regions is perceived as marginal, low intensity and inadequate to satisfy the needs of local communities, but another perspective is that northern agriculture has untapped potential to increase the local supply of food and even contribute to the global food system. Policies across northern jurisdictions target the expansion and intensification of agriculture, contextualized for the diverse social settings and market foci in the north. However, the rapid pace of climate change means that traditional methods of adapting cropping systems and developing infrastructure and regulations for this region cannot keep up with climate change impacts. Moreover, the anticipated conversion of northern cold-climate natural lands to agriculture risks a loss of up to 76% of the carbon stored in vegetation and soils, leading to further environmental impacts. The sustainable development of northern agriculture requires local solutions supported by locally relevant policies. There is an obvious need for the rapid development of a transdisciplinary, cross-jurisdictional, long-term knowledge development, and dissemination program to best serve food needs and an agricultural economy in the boreal and Arctic regions while minimizing the risks to global climate, northern ecosystems and communities.

    DOI: 10.3389/fsufs.2021.663448

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  • Dynamic Mapping of Subarctic Surface Water by Fusion of Microwave and Optical Satellite Data Using Conditional Adversarial Networks Reviewed

    Hiroki Mizuochi, Yoshihiro Iijima, Hirohiko Nagano, Ayumi Kotani, Tetsuya Hiyama

    Remote Sensing   13 ( 2 )   175 - 175   2021.1

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

    Surface water monitoring with fine spatiotemporal resolution in the subarctic is important for understanding the impact of climate change upon hydrological cycles in the region. This study provides dynamic water mapping with daily frequency and a moderate (500 m) resolution over a heterogeneous thermokarst landscape in eastern Siberia. A combination of random forest and conditional generative adversarial networks (pix2pix) machine learning (ML) methods were applied to data fusion between the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Advanced Microwave Scanning Radiometer 2, with the addition of ancillary hydrometeorological information. The results show that our algorithm successfully filled in observational gaps in the MODIS data caused by cloud interference, thereby improving MODIS data availability from 30.3% to almost 100%. The water fraction estimated by our algorithm was consistent with that derived from the reference MODIS data (relative mean bias: -2.43%; relative root mean squared error: 14.7%), and effectively rendered the seasonality and heterogeneous distribution of the Lena River and the thermokarst lakes. Practical knowledge of the application of ML to surface water monitoring also resulted from the preliminary experiments involving the random forest method, including timing of the water-index thresholding and selection of the input features for ML training.

    DOI: 10.3390/rs13020175

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  • Practical guide on soil sampling, treatment, and carbon isotope analysis for carbon cycle studies Reviewed

    Jun Koarashi, MAriko Atarashi-Andoh, Hirohiko Nagano

    JAEA Technology   2020-12 ( 2020-012 )   1 - 53   2020.10

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  • Carbon dioxide balance in early-successional forests after forest fires in interior Alaska Reviewed

    Masahito Ueyama, Hiroki Iwata, Hirohiko Nagano, Narumi Tahara, Chie Iwama, Yoshinobu Harazono

    Agricultural and Forest Meteorology   275   196 - 207   2019.9

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.agrformet.2019.05.020

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  • Spectral reflectance and associated photograph of boreal forest understory formation in interior Alaska Reviewed

    Polar Data Journal   2018.11

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  • Links between annual surface temperature variation and land cover heterogeneity for a boreal forest as characterized by continuous, fibre-optic DTS monitoring Reviewed

    Kazuyuki Saito, Go Iwahana, Hiroki Ikawa, Hirohiko Nagano, Robert C. Busey

    Geoscientific Instrumentation, Methods and Data Systems   7 ( 3 )   223 - 234   2018.7

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    Publisher:Copernicus {GmbH}  

    DOI: 10.5194/gi-7-223-2018

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  • In Situ Observations Reveal How Spectral Reflectance Responds to Growing Season Phenology of an Open Evergreen Forest in Alaska Reviewed

    Kobayashi H, Nagai S, Kim Y, Yang W, Ikeda K, Ikawa H, Nagano H, Suzuki R

    Remote Sensing   10 ( 7 )   2018.7

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

    Plant phenology timings, such as spring green-up and autumn senescence, are essential state information characterizing biological responses and terrestrial carbon cycles. Current efforts for the in situ reflectance measurements are not enough to obtain the exact interpretation of how seasonal spectral signature responds to phenological stages in boreal evergreen needleleaf forests. This study shows the first in situ continuous measurements of canopy scale (overstory + understory) and understory spectral reflectance and vegetation index in an open boreal forest in interior Alaska. Two visible and near infrared spectroradiometer systems were installed at the top of the observation tower and the forest understory, and spectral reflectance measurements were performed in 10 min intervals from early spring to late autumn. We found that canopy scale normalized difference vegetation index (NDVI) varied with the solar zenith angle. On the other hand, NDVI of understory plants was less sensitive to the solar zenith angle. Due to the influence of the solar geometry, the annual maximum canopy NDVI observed in the morning satellite overpass time (10-11 am) shifted to the spring direction compared with the standardized NDVI by the fixed solar zenith angle range (60-70 degrees). We also found that the in situ NDVI time-series had a month-long high NDVI plateau in autumn, which was completely out of photosynthetically active periods when compared with eddy covariance net ecosystem exchange measurements. The result suggests that the onset of an autumn high NDVI plateau is likely to be the end of the growing season. In this way, our spectral measurements can serve as baseline information for the development and validation of satellite-based phenology algorithms in the northern high latitudes.

    DOI: 10.3390/rs10071071

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  • 8 million phenological and sky images from 29 ecosystems from the Arctic to the tropics: the Phenological Eyes Network Reviewed

    Shin Nagai, Tomoko Akitsu, Taku M. Saitoh, Robert C. Busey, Karibu Fukuzawa, Yoshiaki Honda, Tomoaki Ichie, Reiko Ide, Hiroki Ikawa, Akira Iwasaki, Koki Iwao, Koji Kajiwara, Sinkyu Kang, Yongwon Kim, Kho Lip Khoon, Alexander V. Kononov, Yoshiko Kosugi, Takahisa Maeda, Wataru Mamiya, Masayuki Matsuoka, Trofim C. Maximov, Annette Menzel, Tomoaki Miura, Toshie Mizunuma, Tomoki Morozumi, Takeshi Motohka, Hiroyuki Muraoka, Hirohiko Nagano, Taro Nakai, Tatsuro Nakaji, Hiroyuki Oguma, Takeshi Ohta, Keisuke Ono, Runi Anak Sylvester Pungga, Roman E. Petrov, Rei Sakai, Christian Schunk, Seikoh Sekikawa, Ruslan Shakhmatov, Yowhan Son, Atsuko Sugimoto, Rikie Suzuki, Kentaro Takagi, Satoru Takanashi, Shunsuke Tei, Satoshi Tsuchida, Hirokazu Yamamoto, Eri Yamasaki, Megumi Yamashita, Tae Kyung Yoon, Toshiya Yoshida, Mitsunori Yoshimura, Shinpei Yoshitake, Matthew Wilkinson, Lisa Wingate, Kenlo Nishida Nasahara

    Ecological Research   33 ( 6 )   1 - 2   2018.6

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

    We report long-term continuous phenological and sky images taken by time-lapse cameras through the Phenological Eyes Network (http://www.pheno-eye.org. Accessed 29 May 2018) in various ecosystems from the Arctic to the tropics. Phenological images are useful in recording the year-to-year variability in the timing of flowering, leaf-flush, leaf-coloring, and leaf-fall and detecting the characteristics of phenological patterns and timing sensitivity among species and ecosystems. They can also help interpret variations in carbon, water, and heat cycling in terrestrial ecosystems, and be used to obtain ground-truth data for the validation of satellite-observed products. Sky images are useful in continuously recording atmospheric conditions and obtaining ground-truth data for the validation of cloud contamination and atmospheric noise present in satellite remote-sensing data. We have taken sky, forest canopy, forest floor, and shoot images of a range of tree species and landscapes, using time-lapse cameras installed on forest floors, towers, and rooftops. In total, 84 time-lapse cameras at 29 sites have taken 8 million images since 1999. Our images provide (1) long-term, continuous detailed records of plant phenology that are more quantitative than in situ visual phenological observations of index trees
    (2) basic information to explain the responsiveness, vulnerability, and resilience of ecosystem canopies and their functions and services to changes in climate
    and (3) ground-truthing for the validation of satellite remote-sensing observations.

    DOI: 10.1007/s11284-018-1633-x

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    Other Link: http://orcid.org/0000-0002-3090-7709

  • Comparison of Gap Fraction and Leaf Area Index Measurements Under Clear and Cloudy Sky Conditions in Alaskan Spruce Forests Reviewed

    KOBAYASHI Hideki, NAGANO Hirohiko, KIM Yongwon, SUZUKI Rikie

    Journal of The Remote Sensing Society of Japan   38 ( 1 )   44 - 50   2018.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Remote Sensing Society of Japan  

    At northern high latitudes, warming trends have been accelerating, and it is important to understand how the terrestrial ecosystems in these regions respond to such climate change. Satellite-based monitoring of vegetation parameters such as the leaf area index (LAI) provides the diagnostic characteristics for terrestrial vegetation dynamics. Thus, an effort to assure data quality through a comparison with ground-based datasets is crucial. The objective of this study is to evaluate LAI from gap fraction measurements under clear and cloudy sky conditions. We performed gap fraction measurements using plant canopy analyzers at four spruce forest sites in interior Alaska, USA, in September to October 2011 and August 2016. The measured gap fraction was then used to compute the LAI. After correcting the scattering radiation effect on the gap fraction, we obtained an LAI (<i>L</i><sub>m</sub>) of 1.00 to 1.75. When the woody area and shoot level clumping effects were taken into account, the green LAI was estimated to range from 1.18 to 2.33. The LAIs estimated after the scattering correction were closer to the LAIs obtained in cloudy sky conditions, suggesting that the LAI obtained in clear sky conditions can be considered to have the same accuracy as that obtained in cloudy sky conditions.

    DOI: 10.11440/rssj.38.44

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    Other Link: http://id.ndl.go.jp/bib/028841656

  • Leaf- and ecosystem-scale photosynthetic parameters for the overstory and understory of boreal forests in interior Alaska Reviewed

    Masahito UEYAMA, Narumi TAHARA, Hirohiko NAGANO, Naoki MAKITA, Hiroki IWATA, Yoshinobu HARAZONO

    Journal of Agricultural Meteorology   74 ( 2 )   79 - 86   2018

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    Publishing type:Research paper (scientific journal)   Publisher:Society of Agricultural Meteorology of Japan  

    DOI: 10.2480/agrmet.d-17-00031

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  • Evaluating the relationship between wildfire extent and nitrogen dry deposition in a boreal forest in interior Alaska Reviewed

    Hirohiko Nagano, Hiroki Iwata

    POLAR SCIENCE   11   96 - 104   2017.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Alaska wildfires may play an important role in nitrogen (N) dry deposition in Alaskan boreal forests. Here we used annual N dry deposition data measured by CASTNET at Denali National Park (DEN417) during 1999-2013, to evaluate the relationships between wildfire extent and N dry deposition in Alaska. We established six potential factors for multiple regression analysis, including burned area within 100 km of DEN417 (BA(100km)) and in other distant parts of Alaska (BA(AK)), the sum of indexes of North Atlantic Oscillation and Arctic Oscillation (OI), number of days with negative OI (OIday), precipitation (PRCP), and number of days with PRCP (PRCPday). Multiple regression analysis was conducted for both time scales, annual (using only annual values of factors) and six-month (using annual values of BA(AK) and BA(100km), and fire and non-fire seasons' values of other four factors) time scales. Together, BA(AK), BA(100km), and OIday, along with PRCPday in the case of the six-month scale, explained more than 92% of the interannual variation in N dry deposition. The influence of BA100km on N dry deposition was ten-fold greater than from BA(AK); the qualitative contribution was almost zero, however, due to the small BA(100km). BA(AK) was the leading explanatory factor, with a 15 +/- 14% contribution. We further calculated N dry deposition during 1950-2013 using the obtained regression equation and long-term records for the factors. The N dry deposition calculated for 1950-2013 revealed that an increased occurrence of wildfires during the 2000s led to the maximum N dry deposition exhibited during this decade. As a result, the effect of BA(AK) on N dry deposition remains sufficiently large, even when large possible uncertainties (&gt;40%) in the measurement of N dry deposition are taken into account for the multiple regression analysis. (C) 2016 Elsevier B.V. and NIPR. All rights reserved.

    DOI: 10.1016/j.polar.2016.11.002

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  • Optimization of a biochemical model with eddy covariance measurements in black spruce forests of Alaska for estimating CO2 fertilization effects Reviewed

    Masahito Ueyama, Narumi Tahara, Hiroki Iwata, Eugenie S. Euskirchen, Hiroki Ikawa, Hideki Kobayashi, Hirohiko Nagano, Taro Nakai, Yoshinobu Harazono

    AGRICULTURAL AND FOREST METEOROLOGY   222   98 - 111   2016.5

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    Understanding how high -latitude terrestrial productivity and evapotranspiration change in association with rising atmospheric CO2 concentration ([CO2]), also known as 'CO2 fertilization', is important for predicting future climate change. To quantify the magnitude of this fertilization effect, we have developed a big -leaf model that couples photosynthesis and stomatal conductance processes. This model was inverted by inputting eddy covariance CO2 and H2O fluxes from four black spruce forests in Alaska to infer spatially representative ecophysiological parameters using a global optimization technique. Inferred seasonal variations in a maximum carboxylation rate at 25 degrees C per unit leaf area and stomatal conductance suggest greater photosynthetic capacity per unit leaf area during the mid -growing season, compared to spring and autumn. The interannual variability of parameters suggest that warm summers stimulate photosynthetic capacity and dry summers force stomatal regulation. Based on the model with optimized parameters, small but clear increases in gross primary productivity (GPP) and decreases in latent heat flux (LE) were estimated to be associated with rising [CO2] from 2002 to 2014 (p &lt; 0.01). With a 23 ppm increase in summertime (June -August) [CO2] from 2002 to 2014, the rates of increase per unit [CO2] were approximately 0.16 +/- 0.04% ppm-1 for GPP and -0.06 +/- 0.03% ppm(-1) for LE from 2002 to 2014. However, considerable uncertainties (greater than 100%) were estimated in the magnitude of the fertilization effect associated with different parameterizations in the biochemical model, indicating the need for ecophysiological studies for boreal plants. A network of eddy covariance instrumentation installed across similar ecosystem types, such as the one used in this study, can be particularly useful for evaluating ecosystem -scale ecophysiological traits and their role under changing environmental conditions. (c) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.agrformet.2016.03.007

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  • Latitudinal gradient of spruce forest understory and tundra phenology in Alaska as observed from satellite and ground-based data Reviewed

    Hideki Kobayashi, Ali P. Yunus, Shin Nagai, Konosuke Sugiura, Yongwon Kim, Brie Van Dam, Hirohiko Nagano, Donatella Zona, Yoshinobu Harazono, M. Syndonia Bret-Harte, Kazuhito Ichii, Hiroki Ikawa, Hiroki Iwata, Walter C. Oechel, Masahito Ueyama, Rikie Suzuki

    REMOTE SENSING OF ENVIRONMENT   177   160 - 170   2016.5

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

    The latitudinal gradient of the start of the growing season (SOS) and the end of the growing season (EOS) were quantified in Alaska (61 degrees N to 71 degrees N) using satellite-based and ground-based datasets. The Alaskan evergreen needleleaf forests are sparse and the understory vegetation has a substantial impact on the satellite signal. We evaluated SOS and EOS of understory and tundra vegetation using time-lapse camera images. From the comparison of three SOS algorithms for determining SOS from two satellite datasets (SPOT-VEGETATION and Terra-MODIS), we found that the satellite-based SOS timing was consistent with the leaf emergence of the forest under story and tundra vegetation. The ensemble average of SOS over all satellite algorithms can be used as a measure of spring leaf emergence for understory and tundra vegetation. In contrast, the relationship between the ground-based and satellite-based EOSs was not as strong as that of SOS both for boreal forest and tundra sites because of the large biases between those two EOSs (19 to 26 days). The satellite-based EOS was more relevant to snowfall events than the senescence of understory or tundra. The plant canopy radiative transfer simulation suggested that 84-86% of the NDVI seasonal amplitude could be a reasonable threshold for the EOS determination. The latitudinal gradients of SOS and EOS evaluated by the satellite and ground data were consistent and the satellite derived SOS and EOS were 3.5 to 5.7 days degree(-1) and -2.3 to -2.7 days degree(-1), which corresponded to the spring (May) temperature sensitivity of -2.5 to -3.9 days degrees C-1 in SOS and the autumn (August and September) temperature sensitivity of 3.0 to 4.6 days degrees C-1 in EOS. This demonstrates the possible impact of phenology in spruce forest understory and tundra ecosystems in response to climate change in the warming Artic and sub-Arctic regions. (C) 2016 The Authors. Published by Elsevier Inc.

    DOI: 10.1016/j.rse.2016.02.020

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  • Methane exchange in a poorly-drained black spruce forest over permafrost observed using the eddy covariance technique Reviewed

    Hiroki Iwata, Yoshinobu Harazono, Masahito Ueyama, Ayaka Sakabe, Hirohiko Nagano, Yoshiko Kosugi, Kenshi Takahashi, Yongwon Kim

    AGRICULTURAL AND FOREST METEOROLOGY   214   157 - 168   2015.12

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

    Ecosystem-scale methane (CH4) exchange was observed in a poorly-drained black spruce forest over permafrost in interior Alaska during the snow-free seasons of 2011-2013, using the eddy covariance technique. The magnitude of average CH4 exchange differed depending on wind direction, reflecting spatial variation in soil moisture condition around the observation tower, due to elevation change within the small catchment. In the drier upper position, the seasonal variation in CH4 emission was explained by the variation in soil water content only. In the wetter bottom, however, in addition to soil temperature and soil water content, seasonal thaw depth of frozen soil was also an important variable explaining the seasonal variation in CH4 exchange for this ecosystem. Total snow-free season (day of year 134-280) CH4 exchanges were 12.0 +/- 1.0, 19.6 +/- 3.0, and 36.6 +/- 4.4 mmol m(-2) season(-1) for the drier upper position, moderately wet area, and wetter bottom of the catchment, respectively. Observed total season CH4 emission was nearly one order smaller than those reported in other northern wetlands, due probably to the relatively low ground water level and low soil temperature. The interannual variation of total snow-free season CH4 emission in the wetter bottom of the catchment was influenced by the amount of rainfall and thaw depth. On the other hand, in the drier upper position the amount of rainfall did not strongly affect the total season CH4 emission. Different responses of CH4 exchange to environmental conditions, depending on the position of a small catchment, should be considered when estimating the spatial variation in CH4 exchange accurately in ecosystems over permafrost. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.agrformet.2015.08.252

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  • Carbon and nitrogen compounds and emission of greenhouse gases in ancient and modern soils of the Arkaim Reserve in the Steppe Trans-Ural Region Reviewed

    K. Inubushi, V. E. Prikhodko, Kh. Nagano, D. V. Manakhov

    EURASIAN SOIL SCIENCE   48 ( 12 )   1306 - 1316   2015.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MAIK NAUKA/INTERPERIODICA/SPRINGER  

    Carbon and nitrogen compounds and the emission of CO2, CH4, and N2O were studied in the ancient buried and modern background soils developed from different parent materials in the Arkaim Reserve of Chelyabinsk oblast. The studies were performed after an 18-year-long period of absence of anthropogenic loads on the local ecosystems. Element contents in the humus horizons of the chernozems of the former plowland and pastures and of the forest soil reach 28-45.6 g/kg for C-org, 2.5-4.5 g/kg for N-tot, 140-423 mg/kg for labile carbon (C-l), 32-73 mg/kg for labile nitrogen (N-l), 350-952 mg/kg for carbon of microbial biomass (C-mic), and 38-85 mg/kg for nitrogen of microbial biomass (N-mic). The contents of different forms of C and N depend on the soil type and texture and on the type of land use, including that before reservation of the territory. The emission of greenhouse gases was examined in this area for the first time. The production of CO2 by the soil buried about 4000 years ago is an order of magnitude lower than that by the modern soil. The emission and sink of N2O are small in both modern and ancient soils. The behavior of methane is clearly different in the automorphic and hydromorphic soils: the former serve as methane sinks, whereas the latter act as methane sources. The rate of the CO2 emission from the soils is controlled by many factors, including the soil type, texture, degree of hydromorphism, composition of parent materials, and type of land use.

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  • Understory CO2, sensible heat, and latent heat fluxes in a black spruce forest in interior Alaska Reviewed

    Hiroki Ikawa, Taro Nakai, Robert C. Busey, Yongwon Kim, Hideki Kobayashi, Shin Nagai, Masahito Ueyama, Kazuyuki Saito, Hirohiko Nagano, Rikie Suzuki, Larry Hinzman

    AGRICULTURAL AND FOREST METEOROLOGY   214   80 - 90   2015.12

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    An open black spruce forest, the most common ecosystem in interior Alaska, is characterized by patchy canopy gaps where the forest understory is exposed. This study measured CO2, sensible heat, and latent heat fluxes with eddy covariance (EC) in one of those large canopy gaps, and estimated understory fluxes in a black spruce forest in 2011-2014. Then understory fluxes and ecosystem fluxes were compared. The understory fluxes during the snow-free seasons were determined by two approaches. The first approach determined understory fluxes as the fluxes from the canopy gap, assuming that fluxes under the canopy crown also had the same magnitude as the canopy gap fluxes. The second approach determined the understory fluxes by scaling canopy gap fluxes with a canopy gap fraction, assuming that only canopy gaps, which mostly constitutes the forest floor, contribute to fluxes. The true understory fluxes would be in between these two estimates. Overall, the understory accounted for 53% (39-66%), 61% (45-77%), 63% (45-80%), 73% (56-90%), and 79% (59-98%) of the total net ecosystem productivity (NEP), gross primary productivity (GPP), ecosystem respiration (RE), sensible heat flux (II), and latent heat flux (LE), respectively. The ratio of understory NEP (NEPU) to the ecosystem NEP (NEPE) and similarly calculated LEU/LEE during the daytime increased with vapor pressure deficit (VPD) at low VPD conditions (similar to 2000 Pa) at half-hourly temporal scale. At high VPD conditions, however, NEPU/NEPE decreased with VPD, whereas LEU/LEE was maintained at the high level even at high VPD conditions. Despite large ranges of the estimates for the understory contributions, we conclude that the understory plays an important role in the carbon and energy balances of the black spruce ecosystem, and their contribution highly depends on the level of VPD. (C) 2015 Elsevier B.V. All rights reserved.

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  • Effects of water vapor dilution on trace gas flux, and practical correction methods Reviewed

    Yoshinobu Harazono, Hiroki Iwata, Ayaka Sakabe, Masahito Ueyama, Kenshi Takahashi, Hirohiko Nagano, Taro Nakai, Yoshiko Kosugi

    JOURNAL OF AGRICULTURAL METEOROLOGY   71 ( 2 )   65 - 76   2015.6

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    The effect of water vapor dilution on CH4 flux was examined here using dynamic chamber measurements at the forest floor of a black spruce forest in interior Alaska. CH4 and CO2 concentrations were differently diluted by increased water vapor in each chamber. After correction for water vapor dilution was applied, source (positive) CH4 flux was enhanced, whereas sink (negative) flux was reduced, and magnitude changed depending on the condition of water vapor.
    Several methods were examined to practically correct water vapor dilution for fluxes previously measured. Numerical correction for all data sampled at high frequency intervals (DAE-method) is highly recommended. Water vapor dilution correction for ensemble-averaged data (SA-method) is also applicable, though not recommended in case of long-term average data for accurate flux determination, especially for data obtained at irregular source strength plots. When evapotranspiration is measured in parallel to CH4 flux, the removal of the water vapor increment due to evapotranspiration in the chamber is another option for correction (HCE-method). This method resulted in similar accuracy to the DAE-method, as long as continuously sampled data were applicable.
    The application of the correction for water vapor dilution to previous tower-based flux data (measured over a wet sedge tundra in Barrow throughout the month of August, 2000) also resulted in an increase in source (positive) flux of 6.6% on average.
    This study concludes that either accurate flux must be determined using mixing ratio, or a water vapor dilution correction must be applied using simultaneously measured water vapor and trace gases.

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  • Does summer warming reduce black spruce productivity in interior Alaska? Reviewed

    Masahito Ueyama, Shinya Kudo, Chie Iwama, Hirohiko Nagano, Hideki Kobayashi, Yoshinobu Harazono, Kenji Yoshikawa

    JOURNAL OF FOREST RESEARCH   20 ( 1 )   52 - 59   2015.2

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    High-latitude warming has had a discernible effect on the productivity of boreal forests. Here, we report a change in the growth responses of a major biome of boreal North America, black spruce, to climatic warming, based on tree rings sampled at 11 sites in interior Alaska. Tree ring growth was negatively correlated with growing season air temperature, but positively correlated with annual precipitation. The magnitude of the negative correlation increased with increasing growing season temperature until the 1980s, suggesting that warming-induced drought restricted the productivity. However, after the mid-1990s, the negative correlation diminished, and tree ring growth responded positively to air temperature, suggesting that the productivity of the high-latitude forest, and potentially its carbon uptake, will increase under expected warming. The future trajectories of high-latitude forests in interior Alaska and associated carbon cycle feedback will depend on the duration and strength of this renewed response under future climatic warming.

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  • Temperature regimes and turbulent heat fluxes across a heterogeneous canopy in an Alaskan boreal forest Reviewed

    Derek Starkenburg, Gilberto J. Fochesatto, Jordi Cristóbal, Anupma Prakash, Rudiger Gens, Joseph G. Alfieri, Hirohiko Nagano, Yoshinobu Harazono, Hiroki Iwata, Douglas L. Kane

    Journal of Geophysical Research   120 ( 4 )   1348 - 1360   2015

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    We evaluate local differences in thermal regimes and turbulent heat fluxes across the heterogeneous canopy of a black spruce boreal forest on discontinuous permafrost in interior Alaska. The data were taken during an intensive observing period in the summer of 2013 from two micrometeorological towers 600m apart in a central section of boreal forest, one in a denser canopy (DC) and the other in a sparser canopy, but under approximately similar atmospheric boundary layer (ABL) flow conditions. Results suggest that on average 34% of the half-hourly periods in a day are nonstationary, primarily during night and during ABL transitions. Also, thermal regimes differ between the two towers
    specifically between midnight and 0500 Alaska Standard Time (AKST) it is about 3°C warmer at DC. On average, the sensible heat flux at DC was greater. For midday periods, the difference between those fluxes exceeded 30% of the measured flux and over 30 W m-2 in magnitude more than 60% of the time. These differences are due to higher mechanical mixing as a result of the increased density of roughness elements at DC. Finally, the vertical distribution of turbulent heat fluxes verifies a maximum atop the canopy crown (2.6 h) when compared with the subcanopy (0.6 h) and above canopy (5.1 h), where h is the mean canopy height. We argue that these spatial and vertical variations of sensible heat fluxes result from the complex scale aggregation of energy fluxes over a heterogeneous canopy.

    DOI: 10.1002/2014JD022338

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  • Effects of land-use type and nitrogen addition on nitrous oxide and carbon dioxide production potentials in Japanese Andosols Reviewed

    YuHua Kong, Mirai Watanabe, Hirohiko Nagano, Keiji Watanabe, Miwa Yashima, Kazuyuki Inubushi

    SOIL SCIENCE AND PLANT NUTRITION   59 ( 5 )   790 - 799   2013.10

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    Land-use type and nitrogen (N) addition strongly affect nitrous oxide (N2O) and carbon dioxide (CO2) production, but the impacts of their interaction and the controlling factors remain unclear. The aim of this study was to evaluate the effect of both factors simultaneously on N2O and CO2 production and associated soil chemical and biological properties. Surface soils (0-10 cm) from three adjacent lands (apple orchard, grassland and deciduous forest) in central Japan were selected and incubated aerobically for 12 weeks with addition of 0, 30 or 150 kg N ha(-1) yr(-1). Land-use type had a significant (p &lt; 0.001) impact on the cumulative N2O and CO2 production. Soils from the apple orchard had higher N2O and CO2 production potentials than those from the grassland and forest soils. Soil net N mineralization rate had a positive correlation with both soil N2O and CO2 production rates. Furthermore, the N2O production rate was positively correlated with the CO2 production rate. In the soils with no N addition, the dominant soil properties influencing N2O production were found to be the ammonium-N content and the ratio of soil microbial biomass carbon to nitrogen (MBC/MBN), while those for CO2 production were the content of nitrate-N and soluble organic carbon. N2O production increased with the increase in added N doses for the three land-use types and depended on the status of the initial soil available N. The effect of N addition on CO2 production varied with land use type; with the increase of N addition doses, it decreased for the apple orchard and forest soils but increased for the grassland soils. This difference might be due to the differences in microbial flora as indicated by the MBC/MBN ratio. Soil N mineralization was the major process controlling N2O and CO2 production in the examined soils under aerobic incubation conditions.

    DOI: 10.1080/00380768.2013.817938

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  • Soils, vegetation, and climate of the southern Transural region in the Middle Bronze Age (by the example of the Arkaim fortress) Reviewed

    V. E. Prikhod'ko, I. V. Ivanov, D. V. Manakhov, N. P. Gerasimenko, K. Inubushi, M. Kawahigashi, Kh Nagano, S. Sugihara

    Eurasian Soil Science   46 ( 9 )   925 - 934   2013.9

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    Paleosols of the unique fortress of Arkaim located in the steppe zone of the southern Transural region (Chelyabinsk oblast) were investigated. The dating of the buried soils was performed using the radiocarbon method. The time of building this archeological monument is the Middle Bronze Age (the Sintashta culture
    the calibrated dating with 1σ confidence is 3700-4000 years ago). Seven pits of paleosols and ten pits of background ordinary chernozems were studied. The soils are loamy and sandy-loamy. The morphological and chemical properties of the buried and background ordinary chernozems are similar
    they differ by the lower content of readily soluble salts in the paleosols as compared to the background ones. The sporepollen spectrum of the Arkaim paleosol is transitional from the steppe to the forest-steppe type. During the existence of this settlement, pine forests with fern ground cover grew, and hygrophytic species (alder and spruce) that nowadays are not recorded in the plant cover occurred. The main feature of the paleosols is the presence of pollen of xerophytic and halophytic herbaceous plants there. The few pollen grains of broad-leaved species testify to a higher heat supply as compared to the current one. Judging by the results of the spore-pollen and microbiomorphic analyses, the climate during the time of building the walls of the settlement was somewhat moister and warmer (or less continental) than the present-day climate. The duration of this period appeared to be short
    therefore, soil properties corresponding to the changed environment could not be formed. They reflect the situation of the preceding period with the climatic characteristics close to the present-day ones. © 2013 Pleiades Publishing, Ltd.

    DOI: 10.1134/S1064229313090032

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  • CO2, N2O and CH4 production/consumption potentials of soils under different land-use types in central Japan and eastern Hungary Reviewed

    YuHua Kong, Hirohiko Nagano, Janos Katai, Imre Vago, Agnes Zsuposne Olah, Miwa Yashima, Kazuyuki Inubushi

    SOIL SCIENCE AND PLANT NUTRITION   59 ( 3 )   455 - 462   2013.6

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    The production/consumption of greenhouse gases (GHG) in soils are of great importance in global warming, but the involved soil physico-chemical and biological characteristics affecting GHG production and consumption potentials are poorly understood in different land-use types. Carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) production/consumption potentials from four land-use types and 10 soil types in central Japan and eastern Hungary, and their relationships with soil characteristics, were investigated. The average of CO2 production in Japanese soils was significantly higher than that of Hungarian soils due to the relatively higher microbial biomass carbon (MBC) content. N2O production from both countries' soils did not exhibit a significant difference. Most soils except Japanese paddy and soybean soils showed the potentials for CH4 consumption. Forest and grassland soils had relatively higher CO2 and N2O production than orchard and cropland soils for both countries. From regression analyses, it could be concluded that soil total nitrogen (TN) and ammonium-nitrogen (NH4 (+)-N) account for 40.8% and 25.5% variations of the soils' CO2 and N2O productions, respectively. The CH4 consumption was positively correlated with soil carbon/nitrogen (C/N) ratio, while soil MBC availability could account for 15% variation of CH4 consumption under aerobic conditions.

    DOI: 10.1080/00380768.2013.775005

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  • 千葉大学森林環境園芸農場の土壌理化学性および微生物性の時間的および空間的変動−2002年,2003年および2011年の調査結果の比較− Reviewed

    永野博彦, 笠原敬弘, 高橋真亜沙, 吉岡 遼, 孔 玉華, 八島未和, 岡崎正規, 鈴木創三, 竹迫 紘, 田村憲司, 隅田裕明, 川東正幸, 小崎 隆, 伊ケ崎健大, 犬伏和之

    食と緑   67 ( 67 )   21 - 27   2013.3

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  • Emissions of carbon dioxide, methane, and nitrous oxide from short- and long-term organic farming Andosols in central Japan Reviewed

    Hirohiko Nagano, Shigeru Kato, Shinji Ohkubo, Kazuyuki Inubushi

    SOIL SCIENCE AND PLANT NUTRITION   58 ( 6 )   793 - 801   2012

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    Here we have investigated the emission of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from long- and short-term organic farming Andosols in Matsumoto city of Nagano, in central Japan. We focus on three upland plots in Matsumoto, distinguished by how long they had each experienced continuous organic farming (OF)in these three cases, since 1971, 2009, and 2010 (plots hereafter termed M39-OF, M1-OF, and M1F-OF, respectively). Since 2001, in M39-OF, mainly rye (Secale cereale L., as green manure) and soybeans [Glycine max (L.) Merril, as crop] were cultivated, in winter and summer respectively, without tillage, other fertilizers and agro-chemicals. In contrast, from 2001 to 2008 in M1-OF, and from 2001 to 2009 in M1F-OF, these plots underwent conventional farming of some vegetables with tillage, fertilizer and agro-chemicals. Soils sampled from M39-OF and M1-OF in August 2009 were incubated for 4 weeks in darkness at 25 degrees C. During these 4 weeks, M39-OF emitted 8.0 times more CO2 and 274 times more N2O than M1-OF. Less than 2?mu g carbon (C) kg1?dry soil of CH4 was emitted from both soils. From February 2010 until January 2011, CO2, CH4, and N2O emission rates of M39-OF and M1F-OF were measured almost monthly, using a closed-chamber method. Annual CO2, CH4, and N2O emissions were 317, 1.7, and 27?g CO2-C equivalent m2 in M39-OF, and 138, 0.2, and 21?g CO2-C equivalent m2 in M1F-OF, respectively. The rye yield in M39-OF was 334?g?C?m2. Soybeans in M39-OF and M1F-OF yielded 290 and 286?g?C?m2, and withdrew 230 and 224?g?C?m2, respectively. Greenhouse gas (GHG) balance was calculated at 52 and 97?g CO2-C equivalent m2 in M39-OF and M1F-OF, respectively. Negative GHG balance indicated that M39-OF was acting as a GHG sink, with higher CH4 absorption than M1F-OF. Further, this beneficial function for global warming was thought to be based on its cultivation system, which had included green manure application since 2001. The difference in gas exchange between incubation and field experiments was considered a reason for the difference in N2O emission between incubation and field experiments.

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  • Carbon and nitrogen contents and greenhouse gas fluxes of the Eurasian steppe soils with different land-use histories located in the Arkaim museum reserve of South Ural, Russia Reviewed

    Hirohiko Nagano, Soh Sugihara, Miwa Matsushima, Susumu Okitsu, Valentina E. Prikhodko, Elena Manakhova, Gennady B. Zdanovich, Dmitry V. Manakhov, Igor V. Ivanov, Shinya Funakawa, Masayuki Kawahigashi, Kazuyuki Inubushi

    SOIL SCIENCE AND PLANT NUTRITION   58 ( 2 )   238 - 244   2012

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    The effects of different land-use histories on contents of soil carbon (C) and nitrogen (N) and fluxes of greenhouse gases [carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O)] measured using the closed chamber method were investigated in the Arkaim museum reserve located in the South Ural of Russia. A natural forest site (NF) and two grassland sites that had different land-use histories (CL: cropland until 1991; PST: pasture until 1991; both sites have been fallow for 18 years) were selected for soil sampling and gas flux measurements. The vegetation in NF was mainly Betula pendula Roth. with steppe cherry and grassy cover. Perennial grasses (Stipa spp., Festuca spp. and others) have been planted in CL and PST since 1991 to establish reserve mode, and the projective cover of these plants were &gt; 90% in both sites in 2009. Soil samples were taken from the A horizon in the three sites, and additionally samples of the O horizon were taken from NF. The contents of soil C and N [total C, total N, soluble organic C, soluble N and microbial biomass C (MBC)] in the O horizon of NF were the largest among all investigated soils (p &lt; 0.05). Additionally, the total C, total N and MBC in PST were significantly larger than in CL (p &lt; 0.05). Positive CO2 fluxes (i.e., CO2 efflux) in all three investigated sites were observed. The CO2 efflux in NF was significantly larger than in CL and PST (129, 30 and 25 mg C m(-2) hour(-1), respectively, p &lt; 0.05), although there was no significant difference in values of CO2 efflux between CL and PST. There were no significant differences in the fluxes of CH4 and N2O among NF, CL and PST (p &gt; 0.05). Our current research indicated that, in soils of the Eurasian steppe zone of Russia, total C, total N and MBC were affected not only by current land-use (i.e., fallow grassland vs. natural forest) but also by past (until 18 years ago) land-use.

    DOI: 10.1080/00380768.2012.661354

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MISC

  • Microbial Biomass and Functions in Paddy Soil Reviewed

    Kazuyuki Inubushi, Hirohiko Nagano

    Microbial Biomass   103   2017.2

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    DOI: 10.1142/9781786341310_0004

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  • Global nitrogen cycling and its availability from soils Reviewed

    Nitrogen Assimilation in Plants   2009

  • Effects of earthworm casts on CO<sub>2</sub> emission from soil

    田中草太, 永野博彦, 安藤麻里子, 小嵐淳

    日本生態学会大会講演要旨(Web)   68th   2021

  • Does Soil Microbial Community Respond to Moderately Elevated Nitrogen Deposition? A Correlation Analysis in a Cool Temperate Forest Surrounded by Pasture Grasslands in Northern Japan

    Hirohiko Nagano, Masataka Nakayama, Genki Katata, Keitaro Fukushima, Takashi Yamaguchi, Makoto Watanabe, Toshiaki Kondo, Mariko Atarashi-Andoh, Tomohiro Kubota, Ryunosuke Tateno, Jun Koarashi

    Research Square (A preprint platform by Springer Nature)   2020.7

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    We analyzed relationships between nitrogen deposition (deposition of nitrate and ammonium ions) and soil microbial properties, which were spatially varied in a cool temperate forest surrounded by normally fertilized pasture grasslands in northern Japan. The aim of the present study was to gain the primary information on soil microbial response to moderately elevated nitrogen deposition (&lt; 10 kg N ha<sup>−1</sup> y<sup>−1</sup>). We established three experimental plots in the forest edge adjacent to the grasslands and other three plots in the forest interior at least 700 m away from the grasslands. During May to November 2018, nitrogen deposition in each plot was measured. In August 2018, litter and soil (0−5 cm depth) samples were collected from all plots to measure net nitrogen mineralization and nitrification rates as indicators of microbial activity, and microbial biomass carbon and nitrogen and various gene abundances (i.e. bacterial 16S rRNA, fungal ITS, bacterial amoA, and archaeal amoA genes) as indicators of microbial abundance. Nitrogen deposition in the forest edge was 1.4-fold greater than that in the forest interior, even while the maximum deposition was 3.7 kg N ha<sup>−1</sup>. Nitrogen deposition was significantly correlated to the net nitrogen mineralization and nitrification rates and the 16S rRNA and bacterial amoA gene abundances. Microbial community structures in litter and soil samples were also analyzed using a high throughput DNA sequencer for the bacterial 16S rRNA and fungal ITS gene amplicons. Microbial community structures were different between litter and soil samples but were similar between the forest edge and interior. Significant correlations of nitrogen deposition to the soil carbon-to-nitrogen ratio, and the nitrate and ammonium contents were also observed. Thus, our results show that moderately elevated nitrogen deposition in nitrogen-limited forest edges likely stimulate microbial activities and abundances in soils.

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  • 森林炭素・窒素循環研究:学術分野を超えた連携は必要か?

    堅田元喜, 福島慶太郎, 小嵐淳, 山口高志, 渡辺誠, 永野博彦, 中山理智, 舘野隆之輔, 黄瀬佳之

    日本森林学会大会学術講演集   131st   2020

  • Effects of earthworm activities on CO2 emission from soil

    田中草太, 永野博彦, 安藤麻里子, 小嵐淳

    日本生態学会大会講演要旨(Web)   67th   2020

  • In situ spectral reflectance observations for the understanding of growing season phenology of a black spruce forest in the permafrost region in Alaska

    小林秀樹, 小林秀樹, 永井信, 永井信, Kim Yongwon, Yang Wei, 池田教子, 伊川浩樹, 永野博彦, 斉藤和之, 斉藤和之, 鈴木力英

    雪氷研究大会講演要旨集(Web)   2018   2018

  • Comparison of Gap Fraction and Leaf Area Index Measurements Under Clear and Cloudy Sky Conditions in Alaskan Spruce Forests

    小林秀樹, 永野博彦, 永野博彦, KIM Yongwon, 鈴木力英

    日本リモートセンシング学会誌   38 ( 1 )   2018

  • 23-11 Greenhouse gaseous dynamics and soil microbial properties in soils of Arkaim, south Urals, Russia : Effects of agricultural history and soil age

    Nagano Hirohiko, Sugihara So, Matsushima Miwa, Prikhodko Valentina E., Manakhova Elena, Zdanovich Gennady B., Zdanovich Dmitry G., Funakawa Shinya, Kawahigashi Masayuki, Inubushi Kazuyuki

    Abstracts of the meeting, the Society of the Science of Soil and Manure   ( 56 )   179 - 179   2010.9

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  • Report on 19th World Congress of Soil Science

    VANO Imre

    Japanese Journal of Soil Science and Plant Nutrition   81 ( 5 )   530 - 531   2010

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    DOI: 10.20710/dojo.81.5_530

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Presentations

  • Laboratory incubation experiments to examine the effects of increased water fluctuation on CO2 release from volcanic ash soils in a Japanese temperate forest

    Hirohiko Nagano, Mariko Atarashi-Andoh, Jun Koarashi

    AGU Fall Meeting 2019  2019.12 

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  • Relationship between nitrogen deposition and soil microbial property in a deciduous broad-leaved forest

    Nagano Hirohiko, Koarashi Jun, Atarashi-Andoh Mariko, Fukushima Keitaro, Nakayama Masataka, Katata Genki, Yamaguchi Takashi, Watanabe Makoto, Kondo Toshiaki, Tateno Ryunosuke

    The Japanese Forest Society Congress  2019  THE JAPANESE FORESTRY SOCIETY

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    Language:Japanese  

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  • Evaluation of the Relationship Between Ground Observed fPAR and Sentinel-2 Derived Vegetation Index in Four Japanese Temperate Forests

    Hirohiko Nagano, Rei Shibata, Yuzuha Izumi, Hiroki Akita

    AGU 2021 Fall Meeting  2021.12  AGU

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    Venue:New Orleans, LA and virtual   Country:United States  

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  • Soil organic carbon and its water-extractable fraction in volcanic ash soils in a Japanese temperate forest: relations to phosphate absorption coefficient and their implication

    Nagano, Hirohiko, Tanaka, Sota, Atarashi-Andoh, Mariko, Koarashi, Jun

    JpGU-AGU Joint Meeting 2020  2020.7 

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  • Carbon and nitrogen cycling in forest: is interdisciplinary collaboration needed?

    Katata Genki, Fukushima Keitaro, Koarashi Jun, Yamaguchi Takashi, Watanabe Makoto, Nagano Hirohiko, Nakayama Masataka, Tateno Ryunosuke, Kinose Yoshiyuki

    The Japanese Forest Society Congress  2020  THE JAPANESE FORESTRY SOCIETY

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    Language:Japanese  

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  • What kind of effect does warming have on soil organic carbon?

    Koarashi Jun, Atarashi-Andoh Mariko, Takagi Kentaro, Kondo Toshiaki, Teramoto Munemasa, Nagano Hirohiko, Saito-Kokubu Yoko, Takagi Masahiro, Ishida Sachinobu, Hiradate Syuntaro, Liang Naishen

    The Japanese Forest Society Congress  2019.5  THE JAPANESE FORESTRY SOCIETY

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    Language:Japanese  

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  • An investigation of carbon dynamics in forest soils using isotopic signatures

    Atarashi-Andoh Mariko, Koarashi Jun, Takagi Kentaro, Kondo Toshiaki, Teramoto Munemasa, Nagano Hirohiko, Saito-Kokubu Yoko, Takagi Masahiro, Ishida Sachinobu, Liang Naishen

    The Japanese Forest Society Congress  2019.5  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2019.5

    Language:Japanese  

    [in Japanese]

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  • Does spatially heterogeneous nitrogen deposition affect nitrogen and carbon dynamics in a decidous broad-leaved forest?

    Katata Genki, Fukushima Keitaro, Koarashi Jun, Yamaguchi Takashi, Watanabe Makoto, Nagano Hirohiko, Nakayama Masataka, Tateno Ryunosuke

    The Japanese Forest Society Congress  2019  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2019

    Language:Japanese  

    <p>[in Japanese]</p>

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  • 1-1-2 乾燥-湿潤サイクルが火山灰土壌の二酸化炭素放出に及ぼす影響(1-1 物質循環・動態,2018年度神奈川大会)

    永野 博彦, 安藤 麻里子, 小嵐 淳

    日本土壌肥料学会講演要旨集  2018.8  一般社団法人 日本土壌肥料学会

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    Event date: 2018.8

    Language:Japanese  

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  • Relationship between aggregate size and organic matter characteristic in Japanese forest soils

    Nagano Hirohiko, Koarashi Jun, Atarashi-Andoh Mariko

    The Japanese Forest Society Congress  2018.5  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2018.5

    Language:Japanese  

    [in Japanese]

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  • <i>In situ</i> spectral reflectance observations for the understanding of growing season phenology of a black spruce forest in the permafrost region in Alaska

    Kobayashi Hideki, Nagai Shin, Kim Yongwon, Yang Wei, Ikeda Kyoko, Ikawa Hiroki, Nagano Hirohiko, Saito Kazuyuki, Suzuki Rikie

    Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research  2018  The Japanese Society of Snow and Ice / Japan Society for Snow Engineering

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    Event date: 2018

    Language:Japanese  

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  • P8-2-20 アラスカ内陸部の北方林土壌において凍結状態からの融解中に起こる温室効果ガス動態の変遷(ポスター,8-2 地球環境,2017年度仙台大会)

    永野 博彦, 重田 遥, 犬伏 和之

    日本土壌肥料学会講演要旨集  2017.9  一般社団法人 日本土壌肥料学会

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    Language:Japanese  

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  • An experimental study about the role of organic matters and microbes in radioactive cesium transfer in forest ecosystem

    Endo Masaki, Kobayashi Tatsuaki, Takahashi Terumasa, Nagano Hirohiko

    The Japanese Forest Society Congress  2017  THE JAPANESE FORESTRY SOCIETY

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    Event date: 2017

    Language:Japanese  

    [in Japanese]

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  • 6-1-9 開放系大気CO<sub>2</sub>増加実験による水田土壌窒素肥沃度の経年変化(6-1 水田土壌肥沃度,2016年度佐賀大会)

    小坂井 宏輔, 永野 博彦, 八島 未和, 和頴 朗太, 林 健太郎, 常田 岳志, 酒井 英光, 中村 浩史, 臼井 靖浩, 長谷川 利拡

    日本土壌肥料学会講演要旨集  2016  一般社団法人 日本土壌肥料学会

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    Language:Japanese  

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  • 6-1-10 開放系大気CO<sub>2</sub>増加実験におけるタカナリの栽培が水田土壌アセチレン還元活性におよぼす影響(6-1 水田土壌肥沃度,2016年度佐賀大会)

    八島 未和, 中村 長流, 田場 秀卓, 永野 博彦, 林 健太郎, 常田 岳志, 荒井 見和, 大久保 卓, 中村 浩史, 臼井 靖浩, 長谷川 利拡

    日本土壌肥料学会講演要旨集  2016  一般社団法人 日本土壌肥料学会

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    Language:Japanese  

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  • 6-1-11 開放系大気CO<sub>2</sub>増加実験におけるタカナリの栽培が水田土壌微生物バイオマスにおよぼす影響(6-1 水田土壌肥沃度,2016年度佐賀大会)

    宮入 大宗, 永野 博彦, 八島 未和, 和穎 朗太, 林 健太郎, 常田 岳志, 荒井 見和, 中村 浩史, 長谷川 利拡, 臼井 靖浩

    日本土壌肥料学会講演要旨集  2016  一般社団法人 日本土壌肥料学会

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    Language:Japanese  

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  • 内陸アラスカのクロトウヒ林におけるメタン交換測定

    岩田拓記, 原薗芳信, 永野博彦, Yongwon Kim, 小杉緑子, 坂部綾香, 高橋けんし, 宮田明, 間野正美, 小野圭介, 植山雅仁

    森林水文ワークショップ2015  2015.3 

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    Language:Japanese  

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  • 6-1-10 水田土壌の無機態窒素測定法の従来法と簡易測定法の比較および検討(6-1 水田土壌肥沃度,2015年度京都大会)

    須藤 翔, 八島 未和, 永野 博彦, 小坂井 宏輔, 田場 秀卓, 宮入 大宗

    日本土壌肥料学会講演要旨集  2015  一般社団法人 日本土壌肥料学会

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    Language:Japanese  

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  • Methane exchange in a lowland black spruce forest over permafrost measured with the eddy covariance technique

    Iwata, Hiroki, Y. Harazono, M. Ueyama, A. Sakabe, H. Nagano, Y. Kosugi, K. Takahashi, Y. Kim

    Arctic Change 2014  2014.12 

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    Language:English  

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  • 微気象学的手法を中心とした生態系スケールでのメタン交換の解明

    岩田拓記, 原薗芳信, 小杉緑子, 植山雅仁, 坂部綾香, 永野博彦, 奥見智佳, 間野正美, 小野圭介, 高橋けんし, 宮田 明

    日本農業気象学会 2014年全国大会  2014.3 

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    Language:Japanese  

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  • Eddy covariance observation of methane exchange in a boreal and a temperate forest ecosystem

    H. Iwata, Y. Harazono, Y. Kosugi, M. Ueyama, M. Mano, K. Ono, A. Sakabe, H. Nagano, K. Takahashi, A. Miyata

    Synthesis Workshop on the Carbon Budget and Forest Ecosystem in the Asian Monitoring Network (The 20th Anniversary of the Takayama Site) in Takayama, Gifu, Japan  2013.10 

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    Language:English  

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  • ロシア・ウラル山脈南部のアルカイム生態保護区のユーラシアステップ土壌―特に古土壌と湿地土壌―における温室効果ガスフラックスと土壌微生物性

    犬伏和之, 永野博彦, 八島(松島)未和, 杉原創, 舟川晋也, 川東正幸, ZDANOVICH Gennady B, PRIKHODKO Valentina E, MANAKHOVA Elena, MANAKHOV Dmitry, IVANOV Igor V

    日本土壌肥料学会講演要旨集  2012.9 

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    Language:Japanese  

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  • 23-17 Effect of Additional N Inputs on Greenhouse Gas Production and N Mineralization under Three Land-use Types

    Abstracts of the meeting, the Society of the Science of Soil and Manure  2012.9  Japanese Society of Soil Science and Plant Nutrition

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  • Greenhouse gaseous dynamics and soil microbial properties in Eurasian steppe soils in Arkaim,south Urals,Russia-Paleosol and wetland soil

    Zdanovich Gennady B, Prikhodko Valentina E, Manakhova Elena, Manakhov Dmitry, Ivanov Igor V

    Abstracts of the meeting, the Society of the Science of Soil and Manure  2012.9  Japanese Society of Soil Science and Plant Nutrition

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    Event date: 2012.9

    Language:Japanese  

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  • 23-18 関東近辺の有機農業畑地土壌における温室効果ガスの動態(23.地球環境)

    永野 博彦, 加藤 茂, 犬伏 和之

    日本土壌肥料学会講演要旨集  2011.8  一般社団法人日本土壌肥料学会

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    Language:Japanese  

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  • 有機農業畑土壌における微生物バイオマスとCO_2フラックスの季節変化(2011年度大会一般講演要旨)

    永野 博彦, 加藤 茂, 大久保 慎二, 犬伏 和之

    土と微生物  2011  日本土壌微生物学会

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    Language:Japanese  

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  • Biological properties of paleosols and present-day soils in Arkaim and its surrounding area, south Urals, Russia

    Nagano, H, Sugihara, S, Utsugi, I, Adachi, M, Okubo, F, Horaguchi, S, Matsushima, M, Okitsu, S, Prikhodko, V.E, Manakhova, E, Zdanovich, G.B, Zdanovich, D.G, Funakawa, S, Kawahigashi, M, Inubushi, K

    19th World Congress of Soil Science, Brisbane Convention and Exhibition Centre, Brisbane, Australia, 1-6 August 2010  2010 

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    Language:English  

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  • 有機農業畑地における温室効果ガスの動態および土壌微生物バイオマスとその群集構造解析(2010年度大会一般講演要旨)

    永野 博彦, 加藤 茂, 犬伏 和之

    土と微生物  2010  日本土壌微生物学会

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    Language:Japanese  

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  • 03-046 Denitrifying bacterium accumulating nitrite and forming nitrous oxide in nitrate broth(Biogeochemical cycles)

    Nagano,Hirhiko, Shinohara,Maki, Seto,Masayuki, Tarao,Mitsunori

    2008.11 

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    Language:Japanese  

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Awards

  • 「研究准教授」の名称付与

    2022.3   新潟大学  

    永野 博彦

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  • FNCA2020年最優秀研究チーム賞

    2020.12   アジア原子力協力フォーラム(FNCA)   Practical Guide on Soil Sampling, Treatment, and Carbon Isotope Analysis for Carbon Cycle Studies

    永井 晴康, 小嵐 淳, 安藤 麻里子, 永野 博彦, 太田 雅和, 木下 尚喜, 鈴木 崇史, 國分 陽子, 藤田 奈津子, 梁 乃申, 松崎 浩之, 堅田 元喜

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Research Projects

  • 容易に抽出可能な水溶性有機物の同位体情報を活用する土壌有機物分解動態の解明

    Grant number:22H05717  2022.6 - 2024.3

    日本学術振興会  科学研究費助成事業 学術変革領域研究(A)  学術変革領域研究(A)

    永野 博彦

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    Grant amount:\4810000 ( Direct Cost: \3700000 、 Indirect Cost:\1110000 )

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  • 水分変動増大とプライミング効果:森林土壌の炭素動態予測高度化へ向けた影響評価

    Grant number:21H02231  2021.4 - 2024.3

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    永野 博彦, 小嵐 淳, 平舘 俊太郎

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

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  • Do the changes in rainfall pattern and temperature under global warming accelerate soil organic matter decomposition of volcanic ash soil?

    Grant number:18K14497  2018.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists  Grant-in-Aid for Early-Career Scientists

    Nagano Hirohiko

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    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    In this study, we examined the hypothesis that the possible changes in precipitation patterns and temperature under global warming accelerate organic matter decomposition and carbon dioxide release of volcanic ash soils, through the soil incubation experiments. Two volcanic ash soils with different physicochemical properties were collected in a deciduous broad-leaved forest in Ibaraki, and were used for the experiment. The incubation experiments showed that the carbon dioxide release from both soils under the dry-wet cycle condition, which simulated the increased soil moisture fluctuation by the precipitation pattern changes, was much greater than that under the continuously constant moisture condition. Furthermore, it was suggested that the observed increase in soil carbon dioxide release due to the increased water fluctuation is important even considering the temperature rise of 2 °C, which is generally predicted for global warming.

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  • Permafrost degradation and greenhouse gas fluxes in a boreal forest: how the soil and biological processes affect the surface-atmosphere interactions

    Grant number:20H00640  2020.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\44460000 ( Direct Cost: \34200000 、 Indirect Cost:\10260000 )

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  • Effect of frizzing and thawing cycle on methane dynamics in discontinuous permafrost belt in tundra

    Grant number:16K14869  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    INUBUSHI Kazuyuki, YASHIMA Miwa, KIM Yongwon, NAGANO Hirohiko

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    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    Methane (CH4) dynamic during the thawing of frozen soils is an important process in northern ecosystems. In this study, frozen soil cores were collected in a black spruce forest of Interior Alaska, vertically grouped into three layers and incubated for 3 weeks, with the measurement of methane fluxes. During the incubation, temperature was weekly changed from 0 to 5 then 10 °C. Net CH4 release was the greatest in bottom layer soils incubated at 0 °C, while net CH4 release was concurrently observed with net CH4 absorption at soils of upper two layers. At 5 and 10 °C, net CH4 release was reduced, then net CH4 uptake was observed in top and middle layer soils. Both net uptake and release of CH4 were reduced by the addition of a chemical inhibitor for anaerobic methanotrophic and methanogenic activity. The genomic information of bacterial and archaeal community gradually changed along the depth, while the overall microbial community less responded to the temperature rising.

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  • Effects of transported wildfire smoke and permafrost melting on both nutrient cycle and ozone emission by notthern boreal forest

    Grant number:26550100  2014.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Harazono Yoshinobu, NAGANO Hirohiko

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    Aerosol deposition caused by wildfire has important roles on nutrient cycle at boreal forest. Increment of wildfire in relation to global warming might enhance the growth and C-budget at boreal forests. We revealed the wildfire effect by dry-deposition observation and model improves.
    Observations were held at flux tower at UAF’s campus with multi-layer filtering system. Filter sampling was conducted in 2014 season and the chemical analyses and trajectory analysis by satellite data were examined in 2015. Deposition of trace element increased when wildfire-smoke reached the site, and it is too low concentration of aerosol to reveal regular depositions regularly.

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Teaching Experience (researchmap)

  • 森林環境論

    2021.4

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  • 温暖化影響・メカニズム学

    2021.4

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  • 環境微生物学特論

    2019.10
    -
    2020.3
    Institution name:東京農工大学大学院

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  • 土壌肥沃度論

    2015.4
    -
    2016.3

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  • 土壌生化学

    2015.4
    -
    2016.3

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  • 土壌学

    2015.4
    -
    2016.3

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  • 生物生産環境学演習

    2015.4
    -
    2016.3

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  • 日本園芸学概論

    2015.4
    -
    2016.3

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Teaching Experience

  • 卒業論文

    2022
    Institution name:新潟大学

  • 陸域環境動態特論

    2022
    Institution name:新潟大学

  • 大気汚染影響評価学特論

    2022
    Institution name:新潟大学

  • 大気影響評価学特論

    2022
    Institution name:新潟大学

  • 環境統計学

    2022
    Institution name:新潟大学

  • 大気環境科学特論

    2022
    Institution name:新潟大学

  • 大気汚染物質科学特論

    2022
    Institution name:新潟大学

  • 土と水

    2021
    Institution name:新潟大学

  • 環境ガバナンス概論

    2021
    Institution name:新潟大学

  • 環境ファシリテーター論及び演習

    2021
    Institution name:新潟大学

  • 温暖化メカニズム・影響学

    2021
    Institution name:新潟大学

  • 育林系演習及び実習

    2021
    Institution name:新潟大学

  • 森林環境論

    2021
    Institution name:新潟大学

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Academic Activities

  • Topic Editor in Remote Sensing" (ISSN 2072-4292)

    Role(s): Planning, management, etc.

    MDPI  2020.9

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  • Reviewer Board Member in Soil Systems (ISSN 2571-8789)

    Role(s): Peer review

    MDPI  2020.4

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    Type:Peer review 

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