【摘要】 采用单因子指数评价方法,分析了北部湾经济区南流江常乐和总江口监测断面2003-2009年的水质类别,结果显示,2006-2008年南流江常乐站的水质逐渐恶化,而位于下游的总江口河段水质稳定。南流江水质的主要污染因子是高锰酸盐指数、氨氮、溶解氧、5日生化需氧量、挥发酚、总磷和粪大肠菌群等。秩相关系数法计算结果表明,5日生化需氧量、挥发酚呈上升趋势。没有经过无害化处理直接排放的工业、生活污水、禽畜养殖排泄,以及化肥、农药等面源污染,是南流江水质恶化的主要影响因素。更多还原

【Abstract】 The single factor index assessment method and Spearman’s rank correlation coefficient method were used to analyze the water quality change of Changle hydrological station and Zongjiangkou water level station in Nanliu River during 2003-2009.The results showed that water quality of Changle station gone worse from 2006 to 2008,but water quality of the lower Zongjiangkou station was good and maintained stable.The main pollution factors of Nanliu River were permanganate index(CODMn),ammonia nitrogen(NH3-N),dissolved oxygen(DO),volatile phenol,five-day biochemical oxygen demand(BOD5),total phosphorus(Tp) and fecal colon bacterial colony.Analysis of Spearman’s rank correlation coefficient showed that BOD5 and volatile phenol went with a rising tendency.It is indicated that water quality of Nanliu River became worse due to the industrial wastewater,urban domestic sewage,livestock waste and agricultural non-point source pollution discharge directly into rivers without treatment.更多还原