模糊聚类法对温带山地灌草丛的分类

本文应用聚类方法对溫带山地灌草丛群落进行定量分析,过程如下:(1)计算群落的相关矩阵R;(2)求模糊等价矩阵B~*;(3)用不同水平截距APH将群落逐步聚类;当APH=0.425时,将溫带山地灌草丛群落划分成10个群丛。它们是细柄草+黄背草群丛,野青茅+白颖苔草群丛,黄背草+获群丛;黄背草+绿毛鹅观草群丛;黄背草+白羊草群丛;白羊草+隐子草群丛;白羊草+大穗结缕草群丛;白羊草+南牡蒿群丛;白羊草+百里香群丛;白羊草+长芒草群丛。同时详细分析了灌草丛性质、成因、演替及利用问题。

A CLASSIFICATION OF GRASSY THICKETS ON THE MOUNTAINS IN THE TEMPERATE REGION WITH THE FUZZY CLUSTER METHOD

In thit paper, Grassy Thickets on the mountains in the temperate region are classified with the Fuzzy Cluster method. The procedure is as follows: (1) calculating similarity matrix R: (2) extracting Fuzzy equivalent matrix R~*: and (3) clustering samples with suitable APH accordingly! When APH=0.425, the grassy thickets are clustered as 10 associations. They are Capillipedium parviflorum+Themeda triandra vat. japonica: Deyeuxia arundinacea+Carex rigescens; Themeda triandra var. japonica+Miscanthus sacchriflorus; Themeda triandra var. japonica+Roegneria pendulina; Themeda triandra var. japonica+Bothriochloa ischaemum; Bothriochloa ischaemum+Cleistogenes hancei; B. ischaemum+Zoysia macrostachys; B. ischaemum+Artemisia eriopoda; B. ischaemum+Thymus serphyllum; and B. ischaemum+Stipa bungeana. The nature, cause of formation, succession and uses of Grassy Thickets are discussed.