2006 Fiscal Year Final Research Report Summary
Evaluation of soil carbon sequestration in a small basin ecosystem
| Project/Area Number |
15310010
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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 | Gifu University |
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Principal Investigator |
KOIZUMI Hiroshi Gifu University, IBES, 流域圏科学研究センター, 教授 (50303516)
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| Co-Investigator(Kenkyū-buntansha) |
AKIYAMA Tsuyoshi Gifu University, IBES, 流域圏科学研究センター, 教授 (10283318)
MARIKO Shigeru Tsukuba University, Inst. of Biological Sciences, 生物科学系, 助教授 (10251018)
OHTSUKA Toshiyuki Ibaraki University, Dep. of Science, 理学部, 助教授 (90272351)
BEKKU Yukiko Tsuru University, Dep. of Primary Education, 初等教育学科, 助教授 (20326094)
YOKUZAWA Masayuki National Inst. of Agro-Environmental Sciences, Dep. of Global Resources, 地球環境部, ユニット長 (80354124)
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| Project Period (FY) |
2003 – 2006
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| Keywords | Carbon sequestration / Soil respiration / Soil carbon / Carbon budget / Carbon dynamics / Root respiration / Takayama super site / River basin ecosystem |
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| Research Abstract |
Ecosystem carbon pools and fluxes were measured with chronosequece in cool-temperate zone, central Japan. Five study sites for secondary succession, ranging from clear-felled site to 100-years mature deciduous forest, were selected in the Takayama and Sugadaira research sites. Four study sites were set on the lower mountain zone of Mt. Fuji for primary succession, young pine forest, mature pine forest, conifer forest and climax deciduous forest, which had different age after vegetation establishment (12-2850 y). SOC pool was the highest (376 tC ha^<-1>) at the herbaceous stage on secondary succession. The SOC pool greatly decreased at pioneer pine forest stage (259 tC ha^<-1>), in turn, gradually recovered at mature deciduous forest. Drastic change of SOC pools was resulted from the differences of NPP allocation between herbaceous stage and pioneer tree stages : the former allocated NPP to short-lived herbaceous parts which recruited to SOC pool, and the latter allocated NPP to long-li
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ved woody component. In contrast, SOC pools increased along the primary succession, 16 to 173 tC ha^<-1>, in Mt. Fuji. The proportion of the biomass pool to the total ecosystem C pool gradually decreased with time, because biomass pool reached at stable state at climax deciduous forest. Therefore, accumulation process of biomass and SOC pools along the primary succession has the different temporal scale.
Moreover, NEP and ecosystem carbon budget of biomass and SOC pools were compared on clear-felled site with 50-years deciduous forest site. Biometric based NEP, as measured by the balance between NPP and Rh, clarified the contribution of various biological processes to the ecosystem carbon budget. Biometric NEP at 50-years deciduous forest was estimated 2.1 tC ha^<-1> y^<-1>, which agreed well with the eddy-covariance based NEE. The contribution of woody increment was rather small (1.3 tC ha^<-1> y^<-1>) and SOC pool played an important role in carbon storage (ΔSOC = 0.8 tC ha^<-1> y^<-1>). In contrast, biometric NEP at the clear-felled sites was estimated-1.1 tC ha^<-1>y^<-1> The contribution of woody increment was nearly the same with the deciduous forest (1.0 tC ha^<-1> y^<-1>). Therefore SOC pool of the clear-felled site greatly decreased (-2.1 tC ha^<-1> y^<-1>) because of the reduction of NPP and litter production. Less
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