滇池水质状况综合评价及变化趋势分析

滇池是国家进行重点环境治理的河湖之一。在对滇池8个监测点采样监测的基础上，评价了2010年滇池水质现状。用均值型综合污染指数法对各监测点主要污染项目作了水体污染程度评价。以2001~2010年监测资料为基础，选取影响滇池水质的主要指标：氨氮、总氮、高锰酸盐指数、5 d生化需氧量、总磷，采用季节性Kendall检验法进行水质变化趋势分析。结果表明，各监测站点水质均为劣Ⅴ类，其中氨氮、总磷污染严重，总氮、5 d生化需氧量指标趋于恶化，高锰酸盐指数无明显变化趋势。

Comprehensive evaluation and trend analysis for water quality of Dianchi Lake

Dianchi Lake is one of the key lakes that are under environmental improvement in China.The water quality status of Dianchi Lake(in 2010) is analyzed based on the data of 8 sampling and monitoring points for Dainchi Lake.The water body pollution degree evaluation is conducted by adopting the mean-value comprehensive pollution index method.Based on the monitoring data from 2001 to 2010,the follow indexes are selected: ammonia nitrogen,total nitrogen,index of permanganate,5d biochemical oxygen demand,total phosphorus,and water quality trend analysis was conducted by seasonal Kendall method.The results show that the water is classified as poorer V,the ammonia nitrogen,total phosphorus are the most serious pollutants,and the total nitrogen,5d biochemical oxygen demand are in a deterioration state,but the index of permanganate has no obvious change.