珠江流域五大高原湖泊近10年水质状况及变化趋势分析

Analysis on Water Pollution Characteristics and Changing Tendency of the Five Plateau Lakes within the Pearl River Basin

基于珠江流域五大高原湖泊2007—2016年水质监测数据,分别对其水质进行了单因子评价、污染特征的层次聚类分析、水质变化趋势的spearman秩相关系数分析,结果表明:(1)采用单因子指数法评价,五大高原湖泊的水质类别均不符合其水质目标的要求;(2)根据聚类分析,第一类为以面源为主的抚仙湖、星云湖及杞麓湖,第二类为城镇生活污水及工业废水点源污染突出的异龙湖,第三类为以砷污染为明显特征的阳宗海;(3)根据spearman秩相关分析,除抚仙湖外,其它湖泊水质均呈现变差趋势,高锰酸盐指数、五日生化需氧量呈普遍变差趋势。

On the basis of the monitoring data from 2007 to 2016 of the five plateau lakes,the single factor assessment method in water quality evaluation,thehierarchicalcluster analysis,and the Daniel's trends test were applied to explore water pollution characteristics and waterchanging tendency. The historical and existing water quality classification couldn't fit the target of water quality requirements. According to the clustering analysis,the first category included the main sources of Fuxian Lake、Xingyun Lake,and Qilu Lake. The second was Yilong Lake,which represented the urban sewage and industrial wastewater pollution. The third was Yangzonghailake polluted by arsenic.According to the Spearman rank correlation method,the water quality of the lakes showed variation trend except Fuxian Lake,especially,COD_(Mn) and BOD5 were generally deteriorating.