瓯江干流丽水段水体富营养化评价

摘要

2009年3月、5月、8月、11月在全长 41.7 Km的瓯江干流丽水段设10个站点,对DO、CODMn、NH3-N、TN、TP等5项水质指标进行了测定,并运用营养状态指数对水体水质进行了分析和评价.结果显示,2个站点水体水质达到地表水环境质量Ⅲ类标准,5个站点水体水质为Ⅳ类标准,3个站点为Ⅴ类标准.评价结果显示2009年全江段水体水质的营养水平全部为中营养水平.%Water quality in ten stations of Iishui section of Oujiang River was evaluated based on five water parameters like DO, CODMn, NH3 -N, TN and TP investigated in March, May, August and November in 2009. Comprehensive trophic state index TLI(Σ) was used to value the water trophic state. The results showed that of ten stations examined, two stations was considered as grade LI in water quality, five stations as grade IV, and three stations as grade V, according to surface water environment criteria of China (GB3838-2002). The evaluation result of TLI(Σ) indicated the water quality of ten stations in 2009 was at meso-trophication.