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《Journal of Glaciology and Geocryology》 2007-06
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Response of Soil Physicochemical Properties to the Changes of the Vegetation Ecosystem on the Tibetan Plateau

WANG Yi-bo1,WANG Gen-xu1,2,ZHANG Chun-min1,LONG Xun-jian1(1.College of Earth and Environment Sciences,Lanzhou University,Lanzhou Gansu730000,China;2.Institute ofMountain Hazards and Environment,Chinese Academy of Sciences,Chengdu Sichuan 610041,China)  
The investigation of soil physicochemical properties in the source regions of the Yellow River indicates that the degeneration of vegetation ecosystem on the Tibetan Plateau results in great soil environment change.By the study of chemistry characteristics of soil organic matters(OM),organic nitrogen(TN),and physical identities,including mechanism form,bulk density and conductivity coefficient in typical sampling area,it is found that soil chemistry and physical properties are in regression obviously in the vegetation degenerating process.The SOM in surface layer of the meadow soil decreased from 179.58 g·kg-1 to 49.48 g·kg-1,the hydrolysable nitrogen has lost 30%.53% of the soil SOM in the deteriorated grassland has been lost,and the hydrolysable nitrogen has lost 28.4%.The soil SOM in swamp land has lose 15.11 g·kg-1.The soil layer is thinning,but the particle size has been coarsening.During the degradation,the soil moisture distribution and content in the topsoil are changing,such as bulk density increasing and desertification.The investigation also shows that the correlation between the plant coverage and conductivity coefficient of soil is quite obvious,and the soil characteristics,physical and chemical,are changing evidently,with a degeneration of alpine ecosystem.
【Fund】: 国家自然科学基金项目(3027025590102006);; 中国科学院百人计划项目(Y105065)资助
【CateGory Index】: S154.4
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