杭州西湖山区次生植被的极点排序和主分量分析

本文应用极点排序法和主分量分析法对杭州西湖山区次生植被的132个样地进行了间接的和直接的排序分析。两种方法的群落分类结果与等级聚类法基本一致, 可分划成2个群丛、6个亚群丛、8个变型和20个亚变型;但在低级分类单位(尤其是亚变型)的划分上, 则带有一定的主观随意性。两种方法的排序图都较好地显示了从发育最差的次生灌草丛到发育较成熟的次生林这样一个连续的植被变异体系;并指示着土壤条件由旱化逐趋中生化的变化梯度, 反映了土壤的水湿条件和肥沃程度是导致次生植被分异的主导因子。

POLAR ORDINATION AND PRINCIPAL COMPONENTS ANALYSIS OF SECONDARY VEGETATION ON WEST LAKE MOUNTAINS IN HANGZHOU

In this paper, the direct and indirect ordination of the present secondary vegetation on West Lake Mountains in Hngzhou has been analysed with the polar ordinatoin method and principal components analysis method according to the notes taken from 132 releves. The present vegetation canbeen divided into 2 Associations, 6 Subassociations, 8 Variants and 20 Subvariants with both methods just similiar to the results with the clustering analysis method. The ordination maps with both methods show obviously the secondary successional serise of vegetation from the secondary shrub-herbage to the maturer secondarv mixed forests and indicate the gradient of soil conditions from xerarch to mesophytization. They reflect that the main factors resulted in the distinguishing the secondary vegetation are the water and fertility of soil.