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作 者 ：张金屯

期 刊 ：植物生态学报 1985年 9卷 4期 页码：306-314

关键词：荆条；

摘 要 ：本文应用模糊聚类分析对荆条灌丛分类进行了研究。聚类过程可分为三步：1．计算相似矩阵R：这一步与其它聚类方法相同，相似系数可有各种选择。 2．寻找模糊等价关系，取R的乘幂 R2，R4，R8，…，若在某一步，有 R*便是一个模糊等价关系。3．聚类：选取适当的置信水平λ进行聚类。本文相似系数采用式中rjk代表二样方j和k的相似系数，M为一适当的常数，以使0

Abstract:In this paper, Fuzzy clustering analysis is used to study the scrub of Vitex negundo var. heterophylla. The procedure of this method is as follows:1. The calculation of similarity matrix R: This is the same as other approaches. Various similarity coefficients may be used here.2. The transformation of R to Fuzzy equivalent relation R*:Make R2,R4,R8, …, if RK=R2K △ R* then, R* is a fuzzy equivalent matrix.3. Clustering: select suitable values of λ and cluster accordingly. Establishing the similarity matrix R: let rjk=l-djk/M(j,k=l,2, 3, …41) where rjk is the similarity coefficient of both quadrants j and k; M, the proper constant chosen at will to make 0

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