峨眉山常绿落叶阔叶混交林的生物多样性及植物区系初探

对峨眉山常绿落叶阔叶混交林的群落结构﹑组成﹑生物多样性及植物区系等几方面进行了研究分析。结果显示峨眉山阔叶混交林由226种维管束植物组成，其中被子植物73科137属207种, 占总种数的91.6%，是峨眉山阔叶混交林的重要组成部分；群落分层现象明显,为乔木层﹑灌木层﹑草本层和层外植物4层，其中草本层发育情况差；科分布型是以热带—亚热带﹑热带—温带为主,各占22.7%, 在属的水平上则以温带分布占绝对优势(52.9%)，揭示了峨眉山阔叶混交林的区系性质是以温带为主的亚热带类型；生物多样性指数处于较低的水平,在经过人为干扰后，群落处于稳定的恢复阶段。

Biodiversity and flora of the mixed evergreen and deciduous broadleaved forest in Emei

The community selected from the mixed evergreen and deciduous broadleaved forest in Emei is analyzed on the structure,composition and floristic geographical composition.The results show that vascular plants contains 226 species,in which angiosperm are composed by 207 species which belong to 137 genera of 73 families.The community is with more and clearer layers which are tree layer,shrub layer,herb layer and interstraturn plant,and the herb layer is undergrown;The families of vascular plants of Tropical-subtropical,Tropical-temperate distributional patterns account for 22.7% respectively,while genera of temperate distribution take a predominated position(52.9%).The results show that floristic geographical composition of the mixed broadleaf forest in Emei is subtropical in which temperate takes an important part;The community of the mixed broadleaf forest in Emei is in the steady convalescence which have been disturbed years ago,and the biodiversity indexes of the community are low.