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| Characterizing the dynamics of soil organic carbon in grasslands on the Qinghai-Tibetan Plateau | |
| 作者姓名： | ZHANG YongQiang TANG YanHong JIANG Jie & YANG YongHui Environmental Biology Division National Institute for Environmental Studies - Tsukuba Japan Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Research Center for Agricultural Resources Institute of Genetics and Develepmental Biology Chinese Academy of Sciences Shijiazhuang China |
| 作者单位： | ZHANG YongQiang1，2，TANG YanHong1，JIANG Jie2 & YANG YongHui3 1 Environmental Biology Division，National Institute for Environmental Studies，305-8506 Tsukuba，Japan; 2 Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，100101 Beijing，China; 3 Research Center for Agricultural Resources，Institute of Genetics and Develepmental Biology Chinese Academy of Sciences，Shijiazhuang 050021，China |
| 摘 要： | Carbon dynamics of grasslands on the Qinghai-Tibetan Plateau may play an important role in regional and global carbon cycles. The CENTURY model (Version 4.5) is used to examine temporal and spatial variations of soil organic carbon (SOC) in grasslands on the Plateau for the period from 1960 to 2002. The model successfully simulates the dynamics of aboveground carbon and soil surface SOC at the soil depth of 0-20 cm and the simulated results agree well to the measurements. Examination of SOC for eight typical grasslands shows different patterns of temporal variation in different ecosystems in 1960-2002. The extent of temporal variation increases with the increase of SOC of ecosystem. SOC increases first and decreases quickly then during the period from 1990 to 2000. Spatially, SOC density obtained for the equilibrium condition declines gradually from the southeast to the northwest on the plateau and showed a high heterogeneity in the eastern plateau. The results suggest that (i) SOC den-sity in the alpine grasslands shows remarkable response to climate change during the 42 years, and (ii) the net carbon exchange rate between the alpine grassland ecosystems and the atmosphere increases from 1990 to 2000 as compared with that before 1990. |
| 收稿时间： | 29 August 2005 |
| 修稿时间： | 26 January 2006 |
Characterizing the dynamics of soil organic carbon in grasslands on the Qinghai-Tibetan Plateau |
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| ZHANG YongQiang,,TANG YanHong,JIANG Jie & YANG YongHui Environmental Biology Division,National Institute for Environmental Studies,- Tsukuba,Japan, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences, Beijing,China, Research Center for Agricultural Resources,Institute of Genetics and Develepmental Biology Chinese Academy of Sciences,Shijiazhuang ,China.Characterizing the dynamics of soil organic carbon in grasslands on the Qinghai-Tibetan Plateau[J].Science in China(Earth Sciences),2007,50(1):113-120. | |
| Authors: | ZHANG YongQiang TANG YanHong JIANG Jie YANG YongHui |
| Institution: | 1. Environmental Biology Division, National Institute for Environmental Studies, 305-8506 Tsukuba, Japan;Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101 Beijing, China 2. Environmental Biology Division, National Institute for Environmental Studies, 305-8506 Tsukuba, Japan 3. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101 Beijing, China 4. Research Center for Agricultural Resources, Institute of Genetics and Develepmental Biology Chinese Academy of Sciences, Shijiazhuang 050021, China |
| Abstract: | Carbon dynamics of grasslands on the Qinghai-Tibetan Plateau may play an important role in regional and global carbon cycles. The CENTURY model (Version 4.5) is used to examine temporal and spatial variations of soil organic carbon (SOC) in grasslands on the Plateau for the period from 1960 to 2002. The model successfully simulates the dynamics of aboveground carbon and soil surface SOC at the soil depth of 0-20 cm and the simulated results agree well to the measurements. Examination of SOC for eight typical grasslands shows different patterns of temporal variation in different ecosystems in 1960-2002. The extent of temporal variation increases with the increase of SOC of ecosystem. SOC increases first and decreases quickly then during the period from 1990 to 2000. Spatially, SOC density obtained for the equilibrium condition declines gradually from the southeast to the northwest on the plateau and showed a high heterogeneity in the eastern plateau. The results suggest that (i) SOC den-sity in the alpine grasslands shows remarkable response to climate change during the 42 years, and (ii) the net carbon exchange rate between the alpine grassland ecosystems and the atmosphere increases from 1990 to 2000 as compared with that before 1990. |
| Keywords: | carbon cycle CENTURY model climate change global warming soil organic carbon |
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