主分量分析在植被演替研究中之作用的探讨

A Discussion on the Function of Principal Components Analysis in the Study of Succession of Vegetation

本文用E、S两组主分量分析,对陕西省铜川地区植被次生演替进行分析。其结果表明,主分量分析是一种在自然条件复杂的较大区域内,研究植被次生演替的有效方法,它有助于认识植被次生演替与生态条件的关系及演替过程中群落性质的变化特点。

In this paper, principal components analysis in two groups, group E and group S. is applied to the study of secondary succession of vegetation in Tongchuan.area. Shaanxi province. In group E, the ordination has been made based on the dominance indexes of the species in communities, focusing on the different vegetation types related to the different envi- ronments to be distinguisthed. In group S, the ordination has been made based on the character of vegetation related to secondary succession in order to show the trend of secondary succession. The results show that the principal components analysis is an ef- fective quantitative method for studying secondary succession of vegeta- tion in a large area where the natural environment is complex. By using this method, the relationship between succession and certain ecological factors can be revealed. The change of communities' properties can be recognized.