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《Acta Pratacultural Science》 2001-03
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The structure and plant species diversity of the degraded ecosystems in alpine Kobresia meadow

WANG Wen-ying1,WANG Qi-ji2 (1.Qinghai Normal University Xining 810008, China; 2.Northwest Plateau Institute of Biology, The Chinese Academy of Sciences, Xining 810001, China)  
The structure and plant species diversity in different degraded succession phrases and their correlation with human disturbance were studied through field investigation in the alpine Kobresia meadow. The results showed that the main factors that led to degeneration of grassland were overgrazing, insect pest, human disturbance and the effect of global change. The total 11 degraded ecosystem were divided into four vegetation types according to the result of PCA ordination. The four vegetation types were the primary vegetation(Ⅳ), the lightly degraded vegetation(Ⅲ), the heavily degraded vegetation(Ⅱ) and extremely degraded vegetation(Ⅰ) individually. Plant richness index was in ⅣⅢⅡⅠ, and plant diversity index had same change trend. Namely, plant diversity index in primary vegetation was higher than that in the degraded vegetation obviously. The grassland degradation led to changes not only in species composition but also plant species diversity. The recovered vegetation was not only for providing material base for grassland sustainable development but also was good for conserving water and controlling soil erosion. It is necessary to strengthen and protect ecology construction in the source of Yangtze River and Yellow River. We must adopt the advanced technology and management experience of abroad.
【Fund】: 国家重大项目资助(K2 95 1- A1- 2 0 4- 0 4);; 中科院重大项目资助 (K2 95 1- 0 6 ) ;; 青海省“九五”科技攻关项目 (96 -N - 112 )资助
【CateGory Index】: S812
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