重庆四面山常绿阔叶林群落多样性与海拔梯度的关系

The Relationship between Species Diversity and Altitudinal Gradient for Evergreen Broad-leaved Forests for Simian Mountain, Chongqing

采用DCCA排序和海拔高度排序相结合的方法,对四面山常绿阔叶林群落物种多样性和海拔高度的关系进行了研究.结果表明:海拔高度是影响所调查样地物种多样性的主要原因.在四面山常绿阔叶林区,乔木层和灌木层的物种丰富度和多样性都随海拔高度的增加而表现出下降的趋势,生态优势度随海拔升高而增大,海拔梯度变化对均匀度无明显影响.草本层的物种多样性与海拔梯度的相关关系似乎并不大.就对环境梯度变化的敏感程度而言,灌木层最敏感.

The relationship between species diversity and altitudinal gradient for evergreen broad-leaved forests in Simian mountain, Chongqing of China was studied by the combination of DCCA ordination and altitude ordination. The results were as follows:species diversity in investigated plots was mainly determined by the altitude. In evergreen broad-leaved forests in Simian mountain, with the increase of the altitude, species richness (S) and diversity (H′) in tree layers and shrub layers decreased, and the ecological dominance (D) increased. The altitude had not significant effects on the evenness (J) in tree layers and shrub layers. For herb layers, species diversity had not close relationship with the altitude. The response of species diversity in shrub layers to environmental gradients was the most sensitive.