河西走廊盐化草甸主要植物群落分布特点及其土壤环境特征

THE DISTRIBUTION AND SOIL ENVIRONMENTAL PROPERTIES OF THE MAIN PLANT COMMUNITIES IN A SALINIZED MEADOW LAND OF HEXI CORRIDOR

采用系统网格法调查河西走廊盐化草甸典型地段的植被和土壤环境因素，用ＤＣＡ排序技术进行定量分析，来划分该区植物群落的分布格局，并以土壤环境指标（有机质、全盐含量、ｐＨ值，潜水位埋深）解释其所形成的５个样方组，反映出内陆干旱次生盐渍化区土壤水盐分布的差别同潜水位的关系。

Forty seven quadrats were surveyed in a saline meadow land of Hexi Corridor. The samples were analyzed using DCA ordination procedure to determine the distr bution patterns of tLe plant communities. Five quadrat groups were separated after DCA ordination. The vegetation distribution patt-erns were explained by soil environmental parameters including organic matter content,total salt content, pH and underground water depth. Theresults indicated that soil salt content and moisture were closely related to the under ground water deptL in arid-saline area.