担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.20575/00000052

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掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

Soil pH significantly impacts microbial activity and community assembly, which in turn determines the temperature sensitivity (Q10) of soil respiration. Due to the high soil acidification in China, it is necessary to understand how soil acidification impacts Q10. Here, the Q10 of soil respiration was examined in a long-term field experiment (1982–present) with different soil pH caused by fertilization management. In this experiment, we selected treatments with neutral pH: (1) no crops and fertilization (CK); (2) crops without fertilization (NF); low pH with (3) crops with chemical fertilization (NPK); and (4) crops with chemical fertilization combined with wheat straw incorporation (WS). Under natural soil temperature changes, we observed that soil acidification lowered the Q10 value of soil respiration. Considering only temperature changes, the Q10 of soil respiration was strongly associated with microbial community composition, alpha diversity, and soil ammonium nitrogen. Considering the interaction between soil pH and temperature, warming strengthened the negative effect of soil pH on the Q10 of soil respiration, and the pathway through which soil pH mediated Q10 included not only microbial community composition, alpha diversity, and biomass but also the soil’s available phosphorus. This work enhanced our insights into the relationships between Q10, temperature, and soil pH by identifying important microbial properties and key soil environmental factors.

DOI： 10.3390/agronomy14051056

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

<jats:title>Abstract</jats:title><jats:p>Spring snowmelt occurs for a short duration on an annual time scale, but their timings considerably affect the carbon and hydrological cycle in high‐latitude ecosystems. Here, we developed a simple snowmelt model, treating the ecosystem surface as a bulk‐surface layer. Energy fluxes across this bulk surface and the snow‐soil boundary determine snow temperature and the energy utilized for snowmelt. Parameterizing the bulk surface using decade‐long eddy covariance site data from two Alaskan open black spruce forests offered an opportunity to quantitatively evaluate meteorological drivers affecting snowmelt timings without the needs for detailed canopy information. The sensitivity analysis suggested that the total snowfall on the forest floor, ranging from 0.35 m in 2016 to about 1 m in 2018 and 2020, was the most crucial driver for snowmelt timing. This factor accounted for a 10‐day difference in the interannual variations in snow disappearance dates. The importance of the snowfall varied from year to year, and in 2013, the late snowmelt was characterized by low air temperatures, which increased sensible heat loss from the snowpack. The importance of atmospheric radiation was revealed in relatively warm years, such as 2016 and 2019. Our modeling approach necessitates adjusting one empirical parameter that reflects the heat conductivity from the bulk surface to the snow, based on observations. Nevertheless, despite this need for adjustment, the bulk‐surface approach helps identify important meteorological drivers underlying observed snowmelt within a simple theoretical framework.</jats:p>

DOI： 10.1029/2023wr035984

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

As a result of climate change, the pan-Arctic region has seen greater temperature increases than other geographical regions on the Earth’s surface. This has led to substantial changes in terrestrial ecosystems and the hydrological cycle, which have affected the distribution of vegetation and the patterns of water flow and accumulation. Various remote sensing techniques, including optical and microwave satellite observations, are useful for monitoring these terrestrial water and vegetation dynamics. In the present study, satellite and reanalysis datasets were used to produce water and vegetation maps with a high temporal resolution (daily) and moderate spatial resolution (500 m) at a continental scale over Siberia in the period 2003–2017. The multiple data sources were integrated by pixel-based machine learning (random forest), which generated a normalized difference water index (NDWI), normalized difference vegetation index (NDVI), and water fraction without any gaps, even for areas where optical data were missing (e.g., cloud cover). For the convenience of users handling the data, an aggregated product is provided, formatted using a 0.1° grid in latitude/longitude projection. When validated using the original optical images, the NDWI and NDVI images showed small systematic biases, with a root mean squared error of approximately 0.1 over the study area. The product was used for both time-series trend analysis of the indices from 2003 to 2017 and phenological feature extraction based on seasonal NDVI patterns. The former analysis was used to identify areas where the NDVI is decreasing and the NDWI is increasing, and hotspots where the NDWI at lakesides and coastal regions is decreasing. The latter analysis, which employed double-sigmoid fitting to assess changes in five phenological parameters (i.e., start and end of spring and fall, and peak NDVI values) at two larch forest sites, highlighted a tendency for recent lengthening of the growing period. Further applications, including model integration and contribution to land cover mapping, will be developed in the future.

DOI： 10.1186/s40645-024-00614-1

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その他リンク： https://link.springer.com/article/10.1186/s40645-024-00614-1/fulltext.html

掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.envres.2023.117224

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.atmosenv.2023.119640

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掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：{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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記述言語：英語  

J-GLOBAL

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.agrformet.2019.05.020

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DOI： 10.20575/00000004

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出版者・発行元：Copernicus {GmbH}  

DOI： 10.5194/gi-7-223-2018

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs10071071

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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その他リンク： http://orcid.org/0000-0002-3090-7709

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 日本リモートセンシング学会  

DOI： 10.11440/rssj.38.44

CiNii Article

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その他リンク： http://id.ndl.go.jp/bib/028841656

掲載種別：研究論文（学術雑誌）   出版者・発行元：Society of Agricultural Meteorology of Japan  

DOI： 10.2480/agrmet.d-17-00031

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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.

DOI： 10.1134/S1064229315120091

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

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.

DOI： 10.1016/j.agrformet.2015.08.247

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SOC AGRICULTURAL METEOROLOGY JAPAN  

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.

DOI： 10.2480/agrmet.D-14-00003

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER JAPAN KK  

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.

DOI： 10.1007/s10310-014-0448-z

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その他リンク： http://orcid.org/0000-0002-3090-7709

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley-Blackwell  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：TAYLOR & FRANCIS LTD  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）  

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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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：TAYLOR & FRANCIS LTD  

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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その他リンク： http://orcid.org/0000-0002-3090-7709

担当区分：筆頭著者,　責任著者   記述言語：日本語   出版者・発行元：千葉大学園芸学部  

本報告では，千葉大学森林環境園芸農場(以下，沼田農場)において，2011年9月に実施された6大学による合同土壌調査の結果に基づき，特に土壌の基礎的理化学性および微生物性を報告した。さらに前回(2002年および2003年)と今回の調査結果を比較し，沼田農場における土壌の諸性質の時間的および空間的変動について議論した。沼田農場内にある林地2か所，果樹園1か所において，土壌断面調査および土壌理化学性・微生物性の分析を行った。理化学性および微生物性の分析には地表面に最も近い最も近い層(第1層位)および第1層位の直下の層位(第2層位)を供試した。調査項目のうち，2002年から2011年まで共通した傾向を示したものはほとんど無かった。土壌断面調査では，地表から深さ50から65cmにおける埋没腐植層の出現および果樹園における高い活性Al反応が2002年から2011年の調査で共通していた。また，pH(H2O)・全炭素・全窒素の以外の理化学性および微生物性は，植生の違い・層位の違いに関わらず2002年から2011年にかけて比較的大きな変動係数を示していた。その理由としては，沼田農場が傾斜地(傾斜10°程度)に位置しているために，土壌の移動や標高の変化が起こりやすく，狭い面積で環境の変化が起こることが影響していると考えられた。

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：TAYLOR & FRANCIS LTD  

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.

DOI： 10.1080/00380768.2012.739550

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：TAYLOR & FRANCIS LTD  

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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記述言語：日本語   出版者・発行元：(公社)大気環境学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：一般社団法人 日本土壌肥料学会  

DOI： 10.20710/dojo.81.5_530

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：ポスター発表  

開催地：New Orleans, LA and virtual   国名：アメリカ合衆国  

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開催年月日： 2023年

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開催年月日： 2022年9月

記述言語：日本語  

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開催年月日： 2022年5月

会議種別：口頭発表（一般）  

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開催年月日： 2020年

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開催年月日： 2020年

記述言語：日本語  

<p>地球温暖化をはじめとした地球環境問題の理解と解決には、複数の学術分野の研究者らが連携する研究（学際研究）が必要という考えが広まりつつある。このような認識は、森林物質循環に関する研究課題に対しても当てはまると思われ、学際研究を通じた新たな発見が個別研究を推進するなどの研究者へのメリットもある。一方で、研究者にとって学際研究を追求することにはリスクもある。例えば、助成金の確保、業績の評価、論文出版などに困難があるといわれている。また、専門性の違いによるコミュニケーションや手法の創意工夫は学際研究を進める上で最も重要かつ労力を要する部分であるが、それらが評価される機会は限られている。我々は、2017年に大気・水文・生態・微生物・地球化学などの専門家で構成されるプロジェクトチームを結成し、京都大学北海道研究林標茶区の天然林を対象に窒素沈着の影響評価を行ってきた。本発表では、このプロジェクトで行われた学術分野間の交流や挑戦を振り返りながら、学際研究のメリットとリスクについて考える。</p>

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開催年月日： 2019年5月

記述言語：日本語  

温暖化は、微生物による土壌有機炭素の分解を促進させ、土壌からの炭素放出量が増大することで、温暖化をさらに加速させる可能性が危惧されている。しかし、温暖化によって土壌炭素放出がどれだけ増加し、その増加がどのくらい持続するのかについては、土壌有機炭素の貯留・分解メカニズムに関する科学的知見が不足しており、不明のままである。本研究では、国立環境研究所が長期にわたって温暖化操作実験を展開し、土壌炭素放出の温暖化影響を評価している国内5つの森林サイトにおいて調査を実施した。各サイトの温暖化処理区と非処理区において、土壌有機炭素の貯留実態を、量、質（土壌鉱物との結合形態、有機炭素の化学構造、滞留時間など）、分解の温度応答の3つの観点で分析評価し、比較した。本講演では、これらの結果に基づいて、長期にわたる温暖化が土壌に貯留する有機炭素にどのような変化をもたらし、また、温暖化によって土壌炭素放出の増大がいかに持続しうるかについて議論する。

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開催年月日： 2019年5月

記述言語：日本語  

森林の土壌有機物に含まれる炭素及び窒素の安定同位体比は深度とともに上昇することが数多く報告されている。安定同位体比の分布には様々な要因が関与するものの、その変動は有機物の生成・分解における同位体効果によって起きることから、異なる森林における安定同位体比の鉛直分布の違いは土壌有機物の蓄積・分解状況の違いを反映していると考えられる。本研究では、北海道から九州の気候や植生の異なる5つの森林を対象として、深度別に土壌を採取して比重分画を行い、炭素・窒素濃度及び安定同位体比を測定するとともに、放射性炭素を測定することで、各森林における土壌有機物の同位体比分布を調査した。土壌有機物の炭素及び窒素安定同位体比は、北海道の泥炭土壌サイト以外では全て深度とともに上昇したが、その変化量は平均気温及び放射性炭素で評価した有機炭素の滞留時間と関連を示した。泥炭土壌サイトでは、土壌層内で安定同位体比の明確な変化はなく、分解の進んでいない有機物が表層に長期間堆積していることが示された。さらに比重分画の結果も合わせて土壌有機物の蓄積・分解の地域特性を考察する。

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開催年月日： 2019年

記述言語：日本語  

<p>大気中の反応性窒素の生態系への過剰負荷による窒素飽和は、植物−土壌間での窒素動態だけでなく、森林の炭素蓄積機能にも影響を及ぼす。発表者らは、過去のデータからこのような影響は反応性窒素の乾性沈着の空間的不均一性に依存するという仮説を立て、大気・土壌・植物・陸水等の複数分野の専門家で構成される新しいプロジェクトを立ち上げた。研究対象地域として、源流域から窒素飽和が進行している可能性がある北海道標茶町の北海道研究林（落葉広葉樹林）の林内部と農畜産由来の大気アンモニアの沈着の影響を受けやすい林縁部に複数の調査区を設けた。2018年生育期の観測結果により、以下のことが明らかになった：林縁部では林内部に比べて、(1)大気アンモニアの地上濃度とその窒素沈着量は高く、(2)O層における有機物の炭素貯留量とC/N比は低かったがδ15Nは高く、(3)表層土壌（0–5 cm層）の細菌量が多く、(4)土壌中の硝酸態窒素の現存量と硝化活性がO層および表層土壌で高く、(5)立木の胸高断面積合計の増加量が高かった。発表では、これらの結果を紹介しながら本プロジェクトの仮説の妥当性を議論する。</p>

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開催年月日： 2019年

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開催年月日： 2018年8月

記述言語：日本語  

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開催年月日： 2018年5月

記述言語：日本語  

土壌には様々な大きさの団粒が混在しており、団粒を構成する有機物の存在量や性質と団粒の大きさとの関係を明らかにすることは、土壌への炭素蓄積プロセスを理解するうえで重要である。本研究では、国内の森林から採取したリン酸吸収係数の異なる複数の土壌について団粒分画を行い、団粒サイズと団粒の炭素（C）・窒素（N）濃度およびC/N比との関係を調査することで、リン酸吸収係数をはじめとする土壌理化学性から団粒サイズと有機物特性との関係を推定できるかを検討した。一般的な黒ボク土と同程度のリン酸吸収係数（14g P₂O₅/kg）を有する森林土壌（宮崎県）では、団粒サイズに依らずC・N濃度は一様であった。広島県の森林で採取した土壌（リン酸吸収係数 4g P₂O₅/kg）では、全団粒に占めるミクロ団粒（直径250μm未満）の重量割合は約15％であったが、C・N濃度はマクロ団粒（直径250μm以上）に比べ約2倍高く、ミクロ団粒のC含有量は全土壌C量の30％に達した。C/N比は、土壌の種類や団粒のサイズに依らず15前後を示した。より多地点での調査が必要であるものの、有機物濃度の団粒サイズに対する依存性をリン酸吸収係数から推定できる可能性が示唆された。

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開催年月日： 2018年

記述言語：日本語  

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開催年月日： 2017年9月

記述言語：日本語  

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開催年月日： 2017年

記述言語：日本語  

コナラとアカマツの放射性セシウム（RCs）移行・吸収における有機物と微生物の影響を比較するため、福島県川俣町で採取した鉱質土壌を充填したポットを用いて、コナラとアカマツの苗木の栽培試験を行った。有機物層の有無による植物のRCs吸収特性を比較するため、同地点から採取した有機物層をポット表面に敷いた有機物施用ポットと無施用ポットをそれぞれの樹種に設けた。葉内のRCs濃度は、コナラ・施用区が604Bq kg^-1、コナラ・無施用区が364Bq kg^-1となり、有機物層があるとRCs吸収量が高い傾向があった。アカマツ・施用区は64Bq kg^-1、アカマツ・無施用区は101Bq kg^-1であり、無施用区の方が若干高い傾向がみられた。野外での調査と同様に、コナラの方がRCs吸収量が大きく、コナラとアカマツではRCs吸収特性が異なることが示唆された。ポット全体の微生物RCs吸収量は、コナラ・施用区が2231Bq m^-2、コナラ・無施用区が1001Bq m^-2、アカマツ・施用区は514Bq m^-2、アカマツ・無施用区は994Bq m^-2であり、苗木のRCs吸収と同様の傾向がみられた。DGGEによる菌叢の予備解析では、有機物層においてナラとマツでバンドの発光の位置や輝度に相対的な違いがみられた。

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開催年月日： 2016年

記述言語：日本語  

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開催年月日： 2016年

記述言語：日本語  

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開催年月日： 2016年

記述言語：日本語  

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開催年月日： 2015年3月

記述言語：日本語  

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開催年月日： 2015年

記述言語：日本語  

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開催年月日： 2014年12月

記述言語：英語  

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開催年月日： 2014年3月

記述言語：日本語  

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開催年月日： 2013年10月

記述言語：英語  

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開催年月日： 2012年9月

記述言語：日本語  

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開催年月日： 2012年9月

記述言語：英語  

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開催年月日： 2012年9月

記述言語：日本語  

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開催年月日： 2011年8月

記述言語：日本語  

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開催年月日： 2011年

記述言語：日本語  

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開催年月日： 2010年9月

記述言語：日本語  

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開催年月日： 2010年

記述言語：英語  

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開催年月日： 2010年

記述言語：日本語  

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開催年月日： 2008年11月

記述言語：日本語  

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記述言語：日本語   会議種別：口頭発表（一般）  

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記述言語：英語   会議種別：口頭発表（一般）  

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種別：査読等 

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