Study on the plant community and species diversity of Taxus wallichiana distribution area in Shuangbai County of Yunan Ailao Mountain National Nature Reserve
In order to understand the structural characteristics and species diversity of plant community that Taxus wallichiana distribution area was in Shuangbai County,Yunnan Ailao Mountain National Nature Reserve,three sample plots that included species T.wallichiana were set up for investigation and analysis.The results showed that there were 53 families,75 genera and 108 species of vascular plants recorded from three communities of T.Wallichianadistribution area,and 12 families,including Rosaceae,Liliaceae,lauraceae,Lepidopteraceae and Fagaceaewere the main components.The families and genera with only one species was accounted for 77.36%and 73.33%of the total families and genera,respectively.Schima noronhae,Rhododendron irroratum,Ilex corallina,Lyonia ovalifolia,Lithocarpus crassifolius were the main tree species in the tree layer,and T.wallichiana was the important associated species in the tree layer.Fargesia wuliangshanensis occupied an absolutely dominant position in shrub layer.The interlayer was dominated by Tetrastigma serrulatum,Euonymus fortunei and Rubus cochinchinensis.The herbs layer was dominated by Carex longipes,Carex praelonga and Dryopteris wallichiana.The index of species diversity among different layers of T.wallichiana community was as follows:tree layer＞herb layer＞inter layer＞shrub layer,indicating that tree layer presented the higtest species diversity,the most abundant species,the most uniform distribution and the most stable community structure.The species composition had low similarity and extremely significantamong three communities of T.wallichiana.
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