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| Soil organic carbon storage and soil CO_2 flux in the alpine meadow ecosystem | |
| 作者姓名： | TAO Zhen SHEN ChengDe GAO QuanZhou SUN YanMin YI WeiXi & LI YingNian School of Geography and Planning Sun Yat-sen University Guangzhou China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Northwest Plateau Institute of Biology Chinese Academy of Sciences Xining China |
| 作者单位： | TAO Zhen1，2，SHEN ChengDe2，GAO QuanZhou1，SUN YanMin2，YI WeiXi2 & LI YingNian3 1 School of Geography and Planning，Sun Yat-sen University，Guangzhou 510275，China; 2 Guangzhou Institute of Geochemistry，Chinese Academy of Sciences，Guangzhou 510640，China; 3 Northwest Plateau Institute of Biology，Chinese Academy of Sciences，Xining 810001，China |
| 基金项目： | Supported by the National Natural Science Foundation of China (Grant Nos. 40231015, 40471120 and 40473002)，the Guangdong Provincial Natural Science Foundation of China (Grant No. 06300102) |
| 摘 要： | High-resolution sampling,measurements of organic carbon contents and 14C signatures of selected four soil profiles in the Haibei Station situated on the northeast Tibetan Plateau,and application of 14C tracing technology were conducted in an attempt to investigate the turnover times of soil organic car-bon and the soil-CO2 flux in the alpine meadow ecosystem. The results show that the organic carbon stored in the soils varies from 22.12×104 kg C hm-2 to 30.75×104 kg C hm-2 in the alpine meadow eco-systems,with an average of 26.86×104 kg C hm-2. Turnover times of organic carbon pools increase with depth from 45 a to 73 a in the surface soil horizon to hundreds of years or millennia or even longer at the deep soil horizons in the alpine meadow ecosystems. The soil-CO2 flux ranges from 103.24 g C m-2 a-1 to 254.93 gC m-2 a-1,with an average of 191.23 g C m-2 a-1. The CO2 efflux produced from microbial decomposition of organic matter varies from 73.3 g C m-2 a-1 to 181 g C m-2 a-1. More than 30% of total soil organic carbon resides in the active carbon pool and 72.8%―81.23% of total CO2 emitted from or-ganic matter decomposition results from the topsoil horizon (from 0 cm to 10 cm) for the Kobresia meadow. Responding to global warming,the storage,volume of flow and fate of the soil organic carbon in the alpine meadow ecosystem of the Tibetan Plateau will be changed,which needs further research. |
Soil organic carbon storage and soil CO_2 flux in the alpine meadow ecosystem |
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| TAO Zhen,,SHEN ChengDe,GAO QuanZhou,SUN YanMin,YI WeiXi & LI YingNian School of Geography and Planning,Sun Yat-sen University,Guangzhou ,China, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou ,China, Northwest Plateau Institute of Biology,Chinese Academy of Sciences,Xining ,China.Soil organic carbon storage and soil CO_2 flux in the alpine meadow ecosystem[J].Science in China(Earth Sciences),2007,50(7). | |
| Authors: | TAO Zhen SHEN ChengDe GAO QuanZhou SUN YanMin YI WeiXi LI YingNian |
| Institution: | 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 3. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China 4. Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001, China |
| Abstract: | High-resolution sampling, measurements of organic carbon contents and 14C signatures of selected four soil profiles in the Haibei Station situated on the northeast Tibetan Plateau, and application of 14C tracing technology were conducted in an attempt to investigate the turnover times of soil organic carbon and the soil-CO2 flux in the alpine meadow ecosystem. The results show that the organic carbon stored in the soils varies from 22.12(104 kg C hm-2 to 30.75(104 kg C hm-2 in the alpine meadow ecosystems, with an average of 26.86(104 kg C hm-2. Turnover times of organic carbon pools increase with depth from 45 a to 73 a in the surface soil horizon to hundreds of years or millennia or even longer at the deep soil horizons in the alpine meadow ecosystems. The soil-CO2 flux ranges from 103.24 g C m-2 a-1 to 254.93 gC m-2 a-1, with an average of 191.23 g C m-2 a-1. The CO2 efflux produced from microbial decomposition of organic matter varies from 73.3 g C m-2 a-1 to 181 g C m-2 a-1. More than 30% of total soil organic carbon resides in the active carbon pool and 72.8%-81.23% of total CO2 emitted from organic matter decomposition results from the topsoil horizon (from 0 cm to 10 cm) for the Kobresia meadow. Responding to global warming, the storage, volume of flow and fate of the soil organic carbon in the alpine meadow ecosystem of the Tibetan Plateau will be changed, which needs further research. |
| Keywords: | Tibetan Plateau alpine meadow soil organic carbon CO2 flux 14C signature |
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