【摘要】 为了探求喀斯特山区河流水质状况及水质时空特征,选取贵州省平寨水库的支流张维河上的8个监测点,于2017年8月—2018年5月,对13项水质指标进行分季节监测。通过SPSS软件,利用主成分分析法,从13项指标中降维得出影响张维河水质的4个主成分,根据各主成分的方差贡献率及主成分的得分进行分析。结果表明:张维河上游主成分综合得分为-4. 158,下游得分为4. 221,上游水质总体上优于下游;全流域冬季主成分得分为2. 327,夏季得分为-0. 787,枯水期污染情况比丰水期严重;点源污染与非点源污染并存,并且以点源污染为主。更多还原

【Abstract】 In order to explore the water quality status and spatio-temporal characteristics of rivers in Karst Mountainous areas,eight monitoring points on Zhangwei River,a tributary of Pingzhai Reservoir( a Guizhou Central Water Conservancy Project),were selected for seasonal monitoring of 13 water quality indicators,from August 2017 to May 2018. Through SPSS software and principal component analysis method,four principal components affecting the water quality of Zhangwei River were selected from 13 indexes,and the variance contribution rate of each principal component and the score of principal component were analyzed. The results showed that the comprehensive score of the principal components in the upper reaches of Zhangwei River was-4. 158,and that in the lower reaches was 4. 221. The water quality in the upper reaches was better than that in the lower reaches generally; the score of the principal components in winter was 2. 327,and that in summer was-0. 787,thus the pollution situation in dry season was more serious than that in flood season; the point source pollution was the main contributor,coexisting with non-point source pollution.更多还原