Study on Dominant Community of Disanthus cercidifolius subsp. longipes from Mountain Sanqingshan of Jiangxi Province

Based on a field survey and plot data analysis,the characteristics of plant community of Disanthus cercidifolius subsp.longipes from Mountain Sanqingshan of Jiangxi province,China,were studied.The results are as follows:the D.cercidifolius subsp.longipes forest is a mid-subtropical montane evergreen broadleaved community,with multi-dominant plant species,and subdominance of species in the tree layer was not obvious.In terms of floristic composition,this community has temperate property and subtropical property,and shows some transitional characteristics.The Simpson Index of community is 0.92,which the corresponding evenness is 0.94;and the Shannon-Wiener Index is 4.20,which the corresponding evenness is 0.79.Comparing the community of D.cercidifolius subsp.longipes in Mountain Sanqingshan,and those of Mt.Qianjiadong and Guanshan,the community characteristics are different obviously,i.e.the Simpson Index,Shannon-Wiener Index and their evenness in Mt.Sanqingshan are more than those of other two regions.Of course,the constitutes,structure,appearance of communities in Mt.Sanqingshan and Qianjiadong are more similar,which belong to subtropical middle mountain evergreen community.Community in Mt.Guanshan belongs to the mountain shrubs,with a simple structure.Analyzing the meteorological data and features of communities,the difference of D.cercidifolius subsp.longipes community maybe affected by annual precipitation and average annual sunlignt.