根据2003-2009年白洋淀水质参数的实测结果,应用水质标识指数法对白洋淀8个国控点位水环境状况分别进行单因子评价和综合评价.结果表明:8个国控点位均表现出COD、TN为主要污染因子,其次为TP和NH4+-N,DO指标除南刘庄外均较好;离府河入淀口较近的南刘庄断面水质综合污染指数较高,其他7个点位差别不大,其中淀水下泄口枣林庄、淀边监测点端村水质较好,表明出水口水质好于进水口水质.时间分析结果表明:南刘庄2009年综合水质标识指数较2003年有所增加,水质污染越来越严重;其他各站点综合水质标识指数较2003年变化不大,水体自净能力增强,水质有所改善.针对水质标识指数评价分析结果,分析了白洋淀的水质环境恶化原因,并提出相应保护对策和治理措施.%This study was carried out to evaluate the water quality of Baiyandain Lake with the method of single factor and comprehensive water quality identification index, based on the data collected from eight national monitoring and controlling sites from 2003 to 2009. The results indicated that in 8 national monitoring and controlling sites the main pollutants were COD and TN, followed by TP and NH4+ -N, and DO was well except Nanliuzhuang; As to the spatial distribution, comprehensive water quality identification index of Nanliuzhuang close to the Fu river is much higher than other sites and there were no significant differences among the other 7 sites. The water quality of Zaolinzhuang and Duan village was better than the other 5 sites,which shows that the water quality of outlets was better than the inlets. As to the time distribution, compared with 2003 comprehensive water quality identification index of Nanliuzhuang in 2009 was slightly increased, and the water pollution was becoming more and more serious.,There were no significant differences among other sites, which shows .that the water self-purification was enhanced and the water quality was imp. roved. According to the analysis results,the reasons of water environmental deterioration in Baiyangdian Lake were discussed, and the corresponding protective measures and treatment measures were put forward.
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