Abstract:

Based on the survey and the data from 64 vegetation quadrat,characteristics of species diversity of plant communities in the Giant Panda habitat of Wolong Natural Reserve were discussed in this paper.The results showed that the variation trends of species diversity indices and evenness indices along the different vegetation types were almost the same: evergreen and deciduous broad-leaved forest>temperate coniferous and broad-leaved mixed forest>deciduous broad-leaved forest>temperate coniferous forest>subalpine coniferous forest,but the species richness indices varied as follows: temperate coniferous forest>deciduous broad-leaved forest>evergreen and deciduous broad-leaved forest>subalpine coniferous forest>temperate coniferous and broad-leaved mixed forest.The species diversity of different plant communities varied with different status of geography,slope,soil,water and caloric,but the variation trends of species diversity indices and evenness indices were consistent except species richness indices.The species richness indices, species diversity indices and evenness indices of plant communities in the Giant Panda habitat increased first with altitudinal increase,and then decreased, finally got stable.Slope is not the key influencing factor to species diversity in the Giant Panda habitat.The species richness varied with aspects of slope as follows:west>north>east>south, and the species diversity indices varied with aspects of slope like this:west>south>north>east,but the evenness indices varied with aspects of slope as follows:south>west>east>north.The study detected that the species richness indices in different plant communities varied as follows: shrub layer>tree layer>herb layer; the species richness of tree layer of 42.9% of the communities were more than that of shrub layer,and the species richness of tree layer of 64.3% of the communities were more than that of herb layer,and the species richness of shrub layer of 92.9% of the communities were more than that of herb layer; the species richness of tree layer were less than that of shrub layer or herb layer in deciduous conifer forests,but the species richness of shrub layer were more than that of herb layer.The species diversity and species evenness of different or same plant growth form varied with different communities generally consistently.

Key words: Wolong Natural Reserve, Giant Panda habitat, plant community, species diversity