九龙江主要控制断面水质评价与变化特征分析

Water Quality Assessment and Change Analysis for Main Control Sections of Jiulong River

九龙江流域的水环境安全是地区社会经济发展的重要保障.本研究综合运用了污染指数法、季节性肯达尔检验和富营养化评价标准对九龙江流域主要的4个断面的监测指标进行水质评价和变化特征分析.研究发现九龙江水质状况整体较好,但是上游地区的雁石桥断面水质连续几年氨氮、BOD5和总磷超过Ⅴ类水质标准,综合污染指数也最高,并且趋势分析中发现雁石桥断面的氨氮和总磷呈显著上升的趋势.上坂、西陂和江东桥断面水质指标多为Ⅱ、Ⅲ类水,水质较好,其中上坂断面水质又稍差于西陂和江东桥.营养程度评价发现江东桥和西陂库区大多处于中营养阶段,但是有向轻度富营养化发展的趋势.九龙江水质受多种因素的影响,其中主要是畜禽养殖污染、工业和农业面源污染.

Water environmental safty is key in socio-economic development of Jiulong River Basin. Using comprehensive pollution index,seasonal Kendall test and eutrophication standards,water quality assessment and change analysis were conducted in four control sections of the river.Results indicated that the general water quality was good,but in Yanshi section of the upstream,ammonia,BOD5 and total phosphorus were all beyond Grade Ⅴ standard,with a high integrated pollution index.Trend analysis showed that in the section,ammonia and total phosphorous pollution were significantly increasing.In Shangban,Xipi and Jiangdong sections,water quality mostly fit Ⅱ or Ⅲ type,showing a better situation.In most reservoir areas,nutrition level was in the middle stage and there was a possibility of developing into eutrophication.Jiulong River was affected mainly by industrial,non-point agricultural and livestock pollutions.