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《Ecology and Environmental Sciences》 2009-04
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Distribution pattern of soil labile organic carbon in Tibetan alpine grassland and its correlation with climatic factors

WANG Jianlin1, OU YANG Hua2, WANG Zhonghong1, CHANG Tianjun1, LI Peng1, SHEN Zhenxi2, ZHONG Zhiming2 1. Plant Sci-Tech Department of Tibet Agricultural and Animal Husbandry College, Linzhi 860000, China; 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China  
Based on the survey from the soil samples along the water-driven East and West Tibet Transect (EWTT) and the temperature-driven North and South Tibet Transect (NSTT) in Tibetan alpine grassland ecosystem, the distribution characteristics of topsoil (0-20cm) organic labile carbon and its correlation with climatic factors were investigated. It was shown that the topsoil labile organic carbon content first increased and then decreased along the latitude, peaking in the middle zone within NSTT ranging from 28°46' to 31°40' N. Interestingly, the distribution of topsoil labile organic carbon in EWTT exhibited a similar pattern ranging from 80°02' to 91°50' E, first increased then decreased along longitude. In NSTT, the annual average temperature was the key climatic factors influencing the distribution of the topsoil labile organic carbon, whereas the annual average rainfall played the critical role in EWTT.
【Fund】: 国家自然科学基金项目(40661007)
【CateGory Index】: S812.2
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