武威平原区饮用水源地土壤指标主成分分析

Principal Component Analysis for Soil Environmental Quality of Centralized Drinking Water Sources in Wuwei Plain Area

采用主成分分析法,以少数的综合变量取代原有的多个变量的特点,结合聚类分析的方法对石羊河流域武威平原区集中式饮用水源地保护区的土壤质量进行综合评价,结果表明:Pb、Ni、Cd、Cr含量是决定当地土壤质量的关键因素;土壤质量综合评价指数可以较好地反映实际土壤质量,当地土壤划分为2级5组,有36.4%的样点达到国家土壤二级标准,其余的63.6%的样点达到国家三级土壤标准。

Principal component analysis,in which the minority comprehensive variable can substitute the original multiple variables,combined with the method of cluster analysis were used to evaluate soil environment quality in centralized drinking water sources in Wuwei Plain area of Shiyang River basin. Results indicated that Pb,Ni,Cd and Cr is the key factor to determine the local soil environment quality,and comprehensive evaluation index of soil quality can better reflect the real soil quality. The local soil was divided into 2 class and 5 group,in which 36.4% sample satisfied Grade Ⅱ of the state soil quality standard,while 63.6% satisfied Grade Ⅲ.