Abstract: Using the data of vegetation analysis on abandoned arable lands of the sub-alpine meadows in Gannan,we calculated the overlap values and dissimilarity coeiffcients of 15 principal component species with the improved formula of ni-che overlap.The ordination and classification of these species were made by Polar Ordination technique and cluster analysis technique respectively.Niche analysis,which is commonly used to measure the ecological similarity between two species,was extended to make a synthetic analysis of entire community.

Key words: niche overlap, classification, ordination

摘要： 用甘南亚高山草甸弃耕地演替群落的样方数据及计测生态位置迭的改进公式,计算了十五个主要组分种间的重迭值和相异系数。用极点排序和等级聚合分类的方法和种的相异系数数据,对此十五个种进行了排序和分类,从而使定量比较种的生态学特性的生态应分析在整个群落水平上得以实现。

关键词: 生态位重迭, 分类, 排序