摘要
从种－多度关系和物种多样性对高寒草甸和高寒灌丛在不同放牧强度下群落结构特性的分析表明，种在群落中的相对重要性发生了变化，种相对多度的分布模式符合对数正态分布，并随放牧强度的变化显示出有规律的改变；同时，表示群落结构特性的指数（Ｓｉｍｐｓｏｎ多样性指数λ、Ｓｈａｎｎｏｎ信息多样性指数Ｈ＇、ＭｃＩｎｔｏｓｈ多样性指数Ｄｍｏ、均匀性指数Ｅ和物种丰富度指数Ｒ）值在各放牧强度群落间却未表现出统计学上的显著差异（Ｐ＞０．０５）。这表明在有些情况下单纯对物种多样性等指数值的比较并不一定能准确地反映出群落结构上的变化，同时也证实了Ｗｅｓｔ关于多样性指数值保持不变或近似但群落结构可能发生变化的推断。
Based on both species-abundance relationship and species diversity,nature of community structure was analyzed under different grazing intensities in alpine meadows and alpine bushlands.The results show that the relative importance of species and the distribution model of species relative abundance,which accords with the lognormal distribution, demonstrated regular change with growing intensities. Though the community structure changed, the values of indices (e. g. Simpson's diversity index,λ,Shannon's diversity index H', McIntosh's diversity index Dmc evenness index E and species richness R)that are normally used to describe the nature of community structure were not significantly different (P>0.05) among the communities of different grazing intensities. All above indicate that the changes in community structure can not be explained perfectly by comparing values of species diversity indices only, This result also confirmed the West's supposition.
出处
《植物生态学报》
CAS
CSCD
北大核心
1996年第2期184-192,共9页
Chinese Journal of Plant Ecology
基金
中国科学院海北高寒草甸生态系统定位站基金
关键词
群落结构
植物生态学
高寒草甸
高寒灌丛
Community structure
Species-abundance relationship
Species diversity
Alpine meadow
Alpine bushland
