日本生態学会大会講演要旨集
The 52nd Annual Meeting of the Ecological Society of Japan
セッションID: A210
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Impacts of climate change on carbon dynamics of grassland in the Tibetan Plateau
*Yongqiang ZhangTang Yanhong
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The Tibetan Plateau, the highest plateau in the world, is mainly covered by alpine grasslands. The plentiful soil organic matter in the alpine can greatly contribute to terrestrial carbon budget. To examine the impact of climate changes on the carbon dynamics of grasslands in the plateau, we used the CENTURY model (ver. 4.5) to simulate carbon dynamics for about 100 alpine grassland sites from 1960 to 2001. After reaching the equilibrium carbon status of these ecosystems after 4000 years from start of the simulation, the observed meteorological data and grassland conditions were then used to drive the model to simulate carbon dynamics for the alpine grasslands. The aboveground carbon, belowground carbon and soil organic carbon corresponded well with the measured results in most of the observed sites. The result suggests that the current model and parameters are reasonable for estimating the carbon dynamics of these alpine grassland ecosystems. Using the climate scenarios in 2003-2100 by Canadian Climate Centre to drive the model we then examined the impacts of climate change and CO2 elevation on the carbon dynamics of these ecosystems. In most cases, the predicted climate changes increased net primary production and caused soil carbon to decrease overall in the plateau. Most of the resulted changes in plant production are less than 10% during the interested period. Moreover, the conditions combined climate change with elevated CO2 also increased the productivity and reduced the grassland carbon losses, but in a different magnitude. The study suggests the complicate effects of climate changes and CO2 elevation on the carbon dynamics of the highest plateau.

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© 2005 The Ecological Society of Japan
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