大岗山中亚热带常绿阔叶林物种多样性研究

对大岗山常绿阔叶林群落物种多样性进行了研究，结果表明，物种丰富度指数、多样性指数和均匀度指数在群落梯度上的分布趋势基本一致，较好地反映了不同植物群落类型在物种组成方面的差异。大岗山常绿阔叶林群落物种多样性的大小与立地条件、林分郁闭度及受干扰的状况有关。一般立地条件较好，林分郁闭度小或林分受强度干扰后正处于次生演替的恢复阶段，物种多样性较高。植物生长型与群落物种多样性指数的关系为：灌木层〉乔木层〉草本层，草本层与乔木层的物种多样性指数较小，灌木层种类丰富。随着海拔高度的增加，常绿阔叶林群落重要值先增后减，中海拔的丰富度最大，由此认为干扰严重低海拔重要值增加，而乔木层在低海拔丰富度最小，草本层丰富度较高。

Studies on Community Types and Species Diversity of Evergreen Broad- leaved Forests in Dagangshan Mountains

The species diversity of evergreen broad - leaved tree communities in Dagangshan mountains was studied in this paper. The distribution trends of species richness indices, species diversity indices and species evenness indices along the community gradient were almost the same. They reflected the different species composition of different plant communities. The species richness indices of the shrub layer were higher than those of both the tree and herb layers. The species diversity indices of the tree layer were lower than those of the shrub and herb layers. The species evenness indices of the shrub layer were higher than those of both the tree and herb layers. The species richness indices and diversity indices of the plant communities that distributed at both the high and low altitudes were higher than those of the plant communities at the middle altitude. The plant communities at the middle altitude had lower species evenness indices mostly, but higher values occurred in the plant communities at all the altitudes.