基于主成分分析法的面源污染对李子口小流域水环境影响评价

以四川省南部县李子口小流域为研究对象，采用主成分分析方法，通过SPSS15．0软件对水质进行了定量评价，并结合综合污染损害指数对水质作出定性评价。结果表明：该流域水质污染高峰主要集中在6～10月份，11月份开始出现下降趋势，次年4月份开始出现升高状态，结合第一、二、三主分所反映的信息量，7月份主要为磷污染，5、7、8月份主要是有机物污染，而氮污染则集中在10月份。最后根据评价结果分析农业面源污染的影响。

Influence Evaluation on Non-point Pollution to Water Environmental in Lizikou Watershed Based on Principal Component Analysis

Lizikou watershed,which locates at Nanbu town in Sichuan province, is considered as the research object. In the research, the quantitative evaluation of water quality is done through SPSS15.0 software by the means of principal component analysis. With integrated pollution damage index,the qualitative evaluation of water quality is done at the same time. The results show that the peak of water pollution in this basin mainly concentrated from June and to October, then a downward trend appeared in November, and it began to rise in the following year in April. Combining the information derived from the first, second and third major component, it is indicated that water in July was mainly polluted by phosphorus;in May, July and August, as mainly the organic pollution, and nitrogen pollution was concentrated in October. Finally, the effects of agricultural non-point pollution are analyzed according to the evaluation results.