鄱阳湖(西北水域)水环境现状及其评价

Status and Evaluation of Water Environment in Northwest of Poyang Lake

依据"十一五"期间鄱阳湖西北水域设立的8个监测断面动态监测资料,分析了鄱阳湖内该区域水环境的现状,进行了水体水质的分析和评价,并采用综合营养指数法和N/P法,进行了该区域的富营养化评价。结果表明,鄱阳湖(西北部水域)水质整体上达到国标《地表水环境质量标准》(GB3838-2002)中Ⅲ类水标准,仅都昌、蛤蟆石2个监测断面2006年总磷、总氮出现超标现象;该区域水域的富营养化目前处于中营养状态,空间上表现为吴城的断面富营养化程度最高,其次是蚌湖,但区域2006～2010年断面N/P比值整体上呈现缓慢的下降趋势。

According to the dynamic monitoring data of eight monitoring sections in northwest region of Poyang Lake,the analysis of water quality and evaluations show that the Poyang Lake has reached the national standard III level in ＂Environmental Quality Standard for Surface Water＂（GB3838-2002） in its northwest region,the TN and TP are higher the standard in Duchang and Hamashi sections only in 2006.The result show this region is in a mesotrophic state,but the N/P ratio in the sections of this region is declining slowly during 2006 to 2010.