宁夏东部退化草原植物群落类型数量分析

THE NUMERICAL CLASSIFICATION AND ORDINATION OF THE DETARIORATED GRASSLAND IN ESTERN NINGXIA

本研究以宁夏东部退化草原生态系统植物群落样地资料为基础 ,应用聚类分析、主成份分析方法对植物群落进行分类和排序研究。结果表明以重要值为测度基础的聚类分析将研究地区 6 5个样地植物群落划分为 14个群系 ,2 3个群丛单位。PCA排序空间反映出各群落类型间的分异关系以及群落分布与环境的关系 ;

Based on fied investigation, grassland communities of deteriorated ecosystem in eastern Ningxia were classified and ordered by cluster and principal component analysis. The result showed that: Based on the important value of population in 65 quadrates, grassland communities in investigated area were classified into 14 formations and 23 associations by cluster analysis. The relationships between different commumities, and community distribution and environmental factors wrer showed out on PCA program, amd indicated that the distribution of communities mainty depended on the combination dynamics of soil moisture and soil salinity.