2013 Fiscal Year Final Research Report
Development of advanced evaluation method for terrestrial CO2 budget by improving nitrogen-cycle processes
| Project/Area Number |
23310015
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
SAIGUSA Nobuko 独立行政法人国立環境研究所, 地球環境研究センター, 副研究センター長 (00251017)
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| Co-Investigator(Kenkyū-buntansha) |
HIURA Tsutomu 北海道大学, 北方生物圏フィールド科学センター, 教授 (70250496)
NAKAJI Tatsuro 北海道大学, 北方生物圏フィールド科学センター, 助教 (40391130)
SASAI Takahiro 名古屋大学, 環境学研究科, 助教 (70443190)
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| Co-Investigator(Renkei-kenkyūsha) |
MURAOKA Hiroyuki 岐阜大学, 流域圏科学研究センター, 教授 (20397318)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 陸域生態系 / 気候変化 / 炭素循環 / 窒素循環 / 生態系モデル / 温度操作実験 |
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| Research Abstract |
Temperature and nitrogen manipulation experiments were conducted in a forest ecosystem in Japan to understand the responses of ecosystem function and structure to the changes in temperature and nitrogen deposition. Environmental control on the CO2 exchange between ecosystems and the atmosphere was also investigated using long-term CO2 flux data over various ecosystems in Japan and in Asia. In addition, a terrestrial biosphere model was upgraded to consider nitrogen cycling processes based on the observed data from various ecosystems. The model successfully simulated the seasonal patterns of C/N ratio in the canopy leaves as well as the ecosystem carbon budget. The carbon and nitrogen budgets in terrestrial ecosystems around Japan were estimated by the model with a spatial resolution of 1km, and the temporal and spatial variations were analyzed in the viewpoint of responses of ecosystems to the changes in the atmospheric nitrogen deposition.
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