武汉市沙湖港富营养化状况分析与评价

根据2007年6月～2008年6月对武汉市沙湖港的水质监测,探讨了沙湖港水质变化特征和富营养化水平。结果表明:沙湖港DO一般在0～2.5mg/L范围内,为缺氧性环境。除硝酸盐氮未超标,氨氮、总氮和总磷均超标。根据地表水环境质量标准(GB3838-2002)中Ⅳ类标准,在各监测点的超标率,总磷均为100%,氨氮分别为86%、95%、100%、100%,总氮分别为90%、95%、95%、95%。总磷平均浓度大于0.660mg/L,为极富营养状态;总氮平均浓度大于4.60mg/L,为极富营养状态。丰水期流量大,氨氮、硝酸盐氮、总磷浓度低于枯水期和平水期。汇入沙湖港的东湖港对氨氮、总磷贡献较大,氨氮浓度偏高,最高达18.30mg/L。总氮是主要污染物,污染指数范围9.49～1.39。氮是沙湖港水体富营养化的限制因素,建议重点控制氮的含量。

An Evaluation on Eutrophic Status of Shahu Channel in Wuhan City

Based on the water quality data from June 2007 to June 2008 of the Shahu Channel, Wuhan, this paper analyses the eutrophication status of its water body. According to the nutrient parameters including NH3-N, TN and TP, which has seriously exceeded the relevant standards, especially TN, the investigation clearly indicates that the Channel water has been highly eutrophicated. In addition, the Donghu Channel, another stream that joins the Shahu Channel carries more nutrient loads such as, NH3-N and phosphorus. It is concluded that nitrogen is the key factor that leads to the Shahu Channel eutrophication and they should be brought under control.