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《Acta Agrestia Sinica》 2002-01
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Study on the Responses of Leymus chinensis Steppe to Grazing in Songnen Plain

WANG Yu hui 1,2 , HE Xing yuan 1, ZHOU Guang sheng 2 (1.Institute of Shenyang Applied Ecology,Chinese Academy of Sciences,Shenyang,110016,China; 2.Laboratory of Quantifative Vegetation Ecology,Institute of Botany CAS,Beijing 100093,China)  
Effects of human activity on terrestrial ecosystems have being drawn more and more attention with the development of global change study.As a case study,the responses of Leymus chinensis steppe of Songnen plain in northeast of China to human being activity(light grazing,middle grazing,heavy grazing and overgrazing)were discussed based on the field observed data.The results indicate that (1)with the increase of grazing intensities from light,middle,heavy to overgrazing,plant coverage and aboveground/belowground biomass decreases,the structure of plant community changes from simple to complexity and to simple,the type of plant community changes from mesophytes+xerophytes to xerophytes and to halophytes.(2)with the increase of grazing intensity,soil volume weight,pH values,soil water content,soil organic matter and the contents of nitrogen,phosphorous,potassium,calcium and magnesium in soil surface(0～10cm) also decrease.And it is in spring that soil water content,soil organic matter and calcium and magnesium suffered more seriously damage from overgrazing.Therefore it is urgent important to find out strategies,methods and countermeasures in order to ensure the sustainable development of Leymus chinensis steppe ecosystem.
【Key Words】： Leymus chinensis steppe Plant community Soil property Grazing
【Fund】： 国家重点基础研究专项经费资助项目《我国生存环境演变和北方干旱化趋势预测研究》(G19990 43 40 7);; 中国科学院知识创新工程项目(KSCX2 -1-0 7)、基金面上项目 (4 990 5 0 0 5 ;3 0 0 70 64 2 );; 国家杰出青年基金 B类项目 (No.3 0 0 2 80 0 1) ;;经费资助
【CateGory Index】： S812.8
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