Species Diversity of Plant Community in Baiyundong Scenic Spot,Lishan Mountains,Shanxi

32 quadrats from Baiyun dong Scenic Spot in Lishan Mountains,Shanxi,and those quadrats were classified into 8 associations by TWINSPAN,moreover,the species diversity of the associations was studied by using species richness indices,evenness indices and species diversity indices,respectively.The results indicated that:(1) In the aspect of change trend,Shannon-Wiener diversity indices is similar to evenness indices,and differ little with richness indices,but is opposite to Simpson diversity indices.Accordant result is achieved by using the 3 indices.(2) The contributions of species at different layers to the species diversity of community were not equivalent,community’s richness indices was decided by the layers of shrubs and herbages,and the species diversity indices and evenness indices were decided by the layers of shrubs and arbors.