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《Journal of Glaciology and Geocryology》 2009-06
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The Succession of Plant Communities in Alpine Grasslands in Different Ages of Enclosing

HU Yu-kun1,GAO Guo-gang1,2,LI Kai-hui1,GONG Yan-ming1,2,YIN Wei1,2,WANG Ji-yun3,CHEN Ai-lian4 (1. Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,rmqi Xinjiang 830011,China; 2. The Graduate University of the Chinese Academy of Sciences,Beijing 100049,China; 3 Grassland Station of Changji Prefecture,Changji Xinjiang 831100,China; 4 Grassland Station of Changji County,Changji Xinjiang 831100,China)  
Bayinbuluke alpine grassland is one of the largest sub-alpine grassland in China. Due to the serious degradation of grassland in the recent years,the state and autonomous regions invested to enclosing the grassland. By using the method of space substituting time,alpine grassland in different ages of enclosing was studied. Four flat plots with relatively uniform topography and enclosed time of 1 year (E1),3 years (E3),5 years (E5) and non-enclosure (G) were selected for studying. The grasslands were freely grazing pasture,grazing rate of 5.7 sheep·hm-2. After enclosure,it was used as spring pasture with 5.7-grazing sheep·hm-2. The non-enclosure plot was loaded 5.7-grazing sheep·hm-2 in addition to the winter. The results showed that the species of community from Leymus tianschanicus+Oxytropis ochrantha Turcz change to Festuca ovina + Stipa purpurea. E1 had the highest richness index and diversity index in the four plots; the Pielou's index increased gradually; index of Simpson was the maximum in G; index of Sorensen was higher than 65% within all the enclosures. The above-ground biomass of E1 was significantly higher than that of G and E3 (P0.05); the belowground biomass of E1,E3 and E5 was significantly different; in G it was significantly lower than that in E3 and E5. The soil porosity of G and E5 were in the two U-ends,the volume weight of G and E5 were in the two inverted U-ends. Along with the changes in the characteristics of the community,index of succession and degree of succession were 3.53,4.28,6.06,6.43 and 43.57,46.35,52.25,61.14,respectively. Both of them were gradually increasing.
【Fund】: 中国科学院新疆生态与地理研究所前沿领域项目(20049016);; 全球环境基金新疆草地资助项目(GEF)资助
【CateGory Index】: S812
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