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《Journal of Glaciolgy and Geocryology》 2002-06
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Soil Organic Carbon Pool of Grasslands on the Tibetan Plateau and Its Global Implication

WANG Gen xu 1, 2 , CHENG Guo dong 1 , SHEN Yong ping 1 (1. Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, Chian; 2. Resources and Environmental College, Lanzhou University, Lanzhou Gansu 730000, China)  
A study of carbon (C) storage in the range of 0~0 75 m deep of soils of various grasslands on the Tibetan Plateau was carried out. It is found that there are 1 627 million km 2 of grasslands in the plateau, where organic carbon content reaches 33 52 Pg of C. Organic carbon is mainly stored in meadow and steppe soils, reaching 23 2 Pg of C stored in organic form. This accounts for 23 44% of China s total organic soil stored carbon or 2 5% of the global soil carbon pool. Carbon emission from the grasslands was estimated, based on the two major modes of emission: (i) natural soil respiration and (ii) shifts in net C flux to/from soil due to land use change and their potential influence on organic matter decomposition. CO 2 emission from the grasslands of the plateau driven by annual soil respiration reaches 1 17 Pg·a -1 of C, accounting for 26 4% of China s total soil respiration or 1 73% of global soil respiration. Because the grasslands is accounted for 1 02% of the global terrestrial area or 16 9% of China s total terrestrial area, this CO 2 emission rate is significantly higher than the mean annual rate of China (about 4 2 Pg·a -1 of C ), and even higher than the global mean rate (about 68 Pg·a -1 of C). In the last 30 years, about 3 02 Pg of C have been emitted from the grasslands of the plateau due to change in land use and grassland degradation. The total CO 2 emission rate from the grasslands of the plateau reaches 1 27 Pg·a -1 of C. Protecting grasslands on the plateau is of great importance for limiting global climate change.
【Fund】: 中国科学院知识创新工程项目 (KZCX1 10 0 6 );; 国家自然科学基金项目( 90 10 2 0 0 6 .);; 中国科学院“西部之光”项目资助
【CateGory Index】: S153.62
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