Community characteristics of Stipa purpurea stepp in the Qinghai Lake region

doi:10.11686/cyxb20140402

Abstract

Abstract: The classification,association and distribution characteristics and relationships between the distributions and environmental factors of Stipa purpurea steppe in the Qinghai Lake region were studied. A combined transect and quadrat method was used to collect field data. Multivariate statistical methods,including cluster analysis,TWINSPAN (two-way indicator species analysis),DCA (detrended correspondence analysis),CCA (canonical correspondence analysis) and correlation analysis,were used to calculate the data on the basis of investigating a large number of vegetation communities in this region. The species composition of S. purpurea in the study area was relatively simple. The dominant families of seed plants were Gramineae and Compositae,and the dominant aerial types of genera were North temperate types. The community in the area could be classified into 4 associations: Ass. S. purpurea+Astragalus polycladus,Ass. S. purpurea+Kobresia humilis,Ass. S. purpurea+Poa indattenuata,Ass. S. purpurea+Sinochasea krylovii. The major environmental factors influencing the distribution of steppe types in the area were first climate factors (mainly average annual precipitation and temperature),then soil factors (mainly soil moisture,organic matter and N,P,K). Changes in evenness index and Simpson index of S. purpurea stepp associations were basically the same,and the indexes of Ass. S. purpurea+Poa indattenuata were the highest. Richness index was largely affected by climate and soil factors,but the Simpson index and evenness index of all environmental factors investigated were not significantly correlated with area. The present study provides the ecological parameters of S. purpurea steppe in the Qinghai Lake region and would be a basis for maintaining the ecosystem equilibrium of ecologically fragile zones.

CLC Number:

S812

YUE Peng-peng,LU Xue-feng,YE Run-rong,ZHOU Yu-bi,YANG Shi-bing,PENG Min. Community characteristics of Stipa purpurea stepp in the Qinghai Lake region[J]. Acta Prataculturae Sinica, 2014, 23(4): 10-10.

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