北京百花山植物种间相关性和植被数量分类

Plant Interspecific Correlation and a Vegetation Numerical Classification of Mount Baihua in Beijing

本文选用中点象限法(Point-centred Quarter Method)搜集到55块有效样地资料,用各样地种的重要值计算定量种联结指数,编绘半数阵、数阵、半矩阵图和矩阵图,精确地表明21种乔木之间,10种乔木与20种灌木之间及10种乔木与40种草本植物之间相关性.同时,依据《中国植被》确立的分类原则、单位和系统,用聚类分析方法,将百花山植被分成11个群系,并结合种联结指数,对11个群系特征进行了描述.

Data from 55 authentic sample plots were collected by means of the point-centred quarter method. Quantitative indices of interspecific association are calculated on the basis of the important values of the species. A semi-data matrix, data matrixes, a semi-matrix diagram and matrix diagrams are drawn, which indicate precisely the interspecific associations between 21 trees, between 10 trees and 20 shrubs, and between 10 trees and 40 herbs. Meanwhile, the vegetation of the Mount Baihua Reserve Region is classified in 11 formations by using the system cluster method according to the principles, units and systems of classification established in The Vegetation of China. The features of 11 formations are described in the light of indices of interspecific association.