拉林河流域省界缓冲区水质现状评价及变化趋势分析

Water Quality Status Evaluation and Dynamics Analysis of Provincial Boundary Buffers in Lalin River Basin

依据2007—2015年的水质监测数据,采用单因子指数法对拉林河流域4个省界缓冲区的水质现状及变化趋势进行了评价分析。结果表明:拉林河吉黑缓冲区1和牤牛河吉黑缓冲区能够达到所在水功能区水质标准,拉林河吉黑缓冲区2水质状况相对较差,超标因子为氨氮和总磷,其中氨氮和总磷全年过半数月份超标,氨氮最高超标1.4倍,总磷最高超标2.55倍。2007—2015年拉林河吉黑缓冲区2水质为Ⅲ~Ⅳ类,枯水期和丰水期水质超标原因分别氨氮污染和COD污染,其中枯水期氨氮浓度比年均值高0.07~1.2倍,丰水期COD浓度比年均值高0.5~1.3倍。

Based on the water quality monitoring data from 2007 to 2015,water quality up-to-standard situation and dynamic trend of 4 provincial boundary buffers in Lalin River Basin were evaluated and analyzed by single factor index method. The results indicate that Jihei Buffer 1 of Lalin River and Maoniu River Jihei Buffer can meet water quality standards of water functional zone,while water quality up-to-standard situation of Lalin River Jihei Buffer 2 is relatively poorly qualified,and the factors exceeding the standards are ammonia nitrogen and total phosphorus,which exceed the standards more than six months a year. The maximum value of ammonia nitrogen can reach more than 1. 4 times than that of the standard,while the total phosphorus is 2. 55 times. The water quality of Lalin River Jihei Buffer 2 from 2007 to 2015 kept level Ⅲ-Ⅳ,the reasons of which are ammoniac nitrogen pollution in dry season and COD pollution in rain season,respectively. Concentration of ammoniac nitrogen in dry season exceeds averagely 0. 07 to 1. 2 times,while concentration of COD in rain season exceeds averagely 0. 5 to 1. 3 times.