The representative plant communities in Dehang valley habitat was studied.The results are as follows: 1) There is quite different among plant composition,structure and diversity of the communities.There is the highest species diversity in the evergreen and deciduous broad-leaved mixed forest,74 species,and the most abundance arbor species in the evergreen broad-leaved forest,20 species.The statistics of species diversity indices show that both Shannon-Wiener index (6.70) and uniformity (3.83) in the secondarybamboo forests are the highest; 2) Study on the flora in different communities show the number of tropical families is higher than temperate ones at the families level,while the flora display significant temperate feature at genus level.In addition to differences in natural habitats,the different degrees of human disturbance may cause the main reason for the change in community characteristics.%对德夯河谷特殊生境区典型植物群落的研究表明:1)不同群落物种的组成、结构和多样性均存在较大差异,常绿落叶阔叶混交林的物种最多,达74种；常绿落叶阔叶林的乔木种类最为丰富,有20种；次生竹林的物种多样性指数最高,Shannon-Wiener指数和均匀度分别为6.70、3.83;2）科层次上,各群落内热带分布科数量明显高于温带分布科；属层次上,温带分布成分进一步发展,各个群落内均以温带性质为主.除自然生境条件的差异外,人类不同强度的干扰可能是造成各群落特征变化的主要原因.
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