论文部分内容阅读
用稀疏曲线法、Ｓｈａｎｎｏｎ－Ｗｅａｖｅｒ指数（Ｈ′）、Ｐｉｅｌｏｕ指数（Ｊ′）分析了重庆缙云山四川大头茶三类群落物种丰富度、多样性和均匀度。结果表明，三类指数均表现为：常绿阔叶林（Ⅰ）＞针阔混交林（Ⅱ）＞纯林（Ⅲ）。群落各层中，草本层多样性高，乔木层较低；丰富度主要与草本层相关，而Ｈ′和Ｊ′与乔木层和灌木层相关较大。生境优越，多样性高；群落透光率也影响林下植物物种多样性。三类群落以Ⅱ→Ⅲ→Ⅰ进程演替，多样性表现为高→低→高。
The species richness, diversity and evenness of three species of Dachatia acuminata in Jinyun Mountain in Chongqing were analyzed by using sparse curve method, Shannon-Weaver index (H ’) and Pielou index (J’). The results showed that all three indexes showed as follows: evergreen broad - leaved forest (Ⅰ)> coniferous and broad - leaved mixed forest (Ⅱ)> pure forest (Ⅲ). Among the community layers, the herb layer has high diversity and low arborous layer. The richness is mainly related to the herb layer, while H ’and J’ are more related to the tree layer and shrub layer. Habitat superior, high diversity; community light transmission rate also affects understory plant species diversity. The three community succession process Ⅱ → Ⅲ → Ⅰ, diversity showed high → low → high.