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《Journal of Glaciology and Geocryology》 2010-02
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A Preliminary Study of the Relationships between Alpine Grassland Biomass and Environmental Factors in the PermafrostRegions of the Tibetan Plateau

CHEN Sheng-yun1,2,ZHAO Lin1,2,QIN Da-he2,YUE Guang-yang1,2,REN Jia-wen2,LI Yuang-shou1,2,ZHAO Yong-hua1,2(1. Observation and Research Station of Qinghai-Tibet Plateau,CAREERI,CAS,Golmud Qinghai 816000,China;2. State Key Laboratory of Cryospheric Sciences,CAREERI,CAS,Lanzhou Gansu 730000,China)  
In order to quantitatively analyze the relationships between the biomass and the environmental factors for the three types of alpine grasslands (alpine marsh meadow,alpine meadow and alpine steppe) in the permafrost regions of Tibetan Plateau,six active layer plots in the plateau were selected. The results show that the underground biomass contributes a large percentage of the total biomass in the alpine grasslands,which concentrates in the depth range from 0 to 10 cm. The factors affecting total biomass and underground biomass rank in the order:soil salinity,soil moisture content and air temperature. However,the factors affecting the aboveground biomass rank in the order:soil moisture content,soil salinity and air temperature. It is also observed that the soil temperature has a negative correlation with biomass. Furthermore,with permafrost degradation,the soil temperature significantly increases,the soil moisture content decreases gradually and the soil salinity continuously increases throughout different soil depths of the active layer (10~50 cm); As a result,a retrograde succession from alpine marsh meadow,alpine meadow to alpine steppe occurs in the alpine grasslands vegetation,and then a obvious decreasing trend will occur for the total coverage and biomass.
【Fund】: 国家自然科学基金项目(40901040);; 冰冻圈科学国家重点实验室开放基金项目(SKLCS08-03);; 中国博士后科学基金项目(20080440741)资助
【CateGory Index】: S812
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