湘江干流水体无机氮污染现状分析

Investigation on the Contamination by Dissloved Inorganic Nitrogen in Xiangjiang River

于2009年1月(枯水期)5、月(繁殖期)和9月(索饵期)对湘江流域湖南段5个监测区域(衡阳、株洲、湘潭、长沙和岳阳)29个监测位点进行水体无机氮污染的分布特征及时空变化进行调查与分析。结果表明:湘江流域湖南段的索饵期无机氮含量最高为1.71mg/L,其次是越冬期1.14mg/L,最低的是繁殖期只有0.77mg/L;从上游衡阳段到下游岳阳段的空间分布特征来看,其无机氮有明显上升的趋势。

It investigated the distributional characteristics and spacetime variations of dissloved inorganic nitrogen（DIN） to 29 monitoring sites in five monitoring regions of Xiangjiang river including Hengyang,Zhuzhou,Xiangtan,Changsha and Yueyang,during three period of drought period,breeding period and seeking period in Jan,May,Sep,2009.The results showed： the DIN concentrations in Xiangjiang river Hunan section were 1.71 mg/L in seeking period,1.14 mg/L in drought period,and 0.77 mg/L in breeding period.In addition,there was ascending tendency of the DIN concentration from the upper stream Hengyang section to the downstream Yueyang section.