甘南玛曲植物群落的多元分析与环境解释

MULTIVARIATE ANALYSIS AND ENVIRONMENTAL INTERPRETATION OF PLANT COMMUNITIES IN MAQU, SOUTH GANSU

应用无偏对应分析（ＤＣＡ）及二岐指示种分析（ＴＷＩＮＳＰＡＮ）对玛曲１７８个植物群落样方资料进行了多元分析排序和数量分类，并应用植物群落的排序值与环境参数的多元回归分析给出各群落类型的定量环境解释，探讨了该区植物群落的基本类型、生态梯度及其与环境因子的定量关系。结果表明，玛曲的植物群落类型及其分布主要取决于热量和湿度。

In this paper, 178 plant community samples collected from Maqu, South Gansu were multivariately analysed by the detranded correspondence analysis (DCA) and the two way indicator species analysis(TWINSPAN). The quantitative environmental interpretation of various plant community types is given by the multivariate regression analysis which connects the ordination scores with environmental parameters. The primary plant community types, ecological gradients, and their quantitative relations with the environmental factors were studied. It is shown by the analysis that the vegetation types and their distribution are maily determined by the thermal and moisture gradients. They are quantitatively determined by the mathematical formulas which contains environmental parameters.