香溪河水质空间分布特性研究

运用聚类分析和主成分分析对香溪河19个样点水质的理化特性进行研究，聚类分析表明，根据各采样点之间水质组分的相似性可将香溪河大致分为3个河段，分别属于不同的亚流域，各亚流域问的特征差异显著，对各河段水质的主成分分析表明，上述3河段的主要水质信息差异很大，第1河段(在河流上游)水质的信息主要体现为总碱度和硬度，第2河段(河流中游)主要体现为可溶性磷酸盐、总磷和氯离子，第3河段(河流下游)则为pH、亚硝酸盐氮、总氮和COD，文中结合香溪河流域地理环境背景，探讨了香溪河水质空间分布格局的成因，为分析流域水质状况及成因提供了一条简单有效的途径。

Spatial distribution of water quality in Xiangxi River,China

Cluster analysis and principal component analysis were used to analyze the physical and chemical characteristics of water samples collected from 19 sampling sites along Xiangxi River.The result of cluster analysis showed that Xiangxi River could be divided into three reaches,which belonged to different sub-basins.The principle component analysis on each reach showed that the main information of water quality was different from each other.In the upper reach,the main information of river water quality was hardness and total alkalinity;in the middle reach,the main information was dissolved phosphorus,total phosphorus and Cl -,in the lower reach,the main information was pH,NO 2 --N,total nitrogen and COD.Furthermore,considering the geographical and environmental backgrounds of the Xiangxi River basin,the reason that caused the different distribution pattern of water quality in Xiangxi River was discussed.Hence,a simple approach to analyze the spatial distribution of water quality was provided.