唐山近郊河流湿地富营养化特征及评价

The eutrophication characteristics and assessment in the outskirt of Tangshan river and wetland

以唐山近郊河流湿地—唐津运河丰南水域段为研究对象,通过为期1年的水质定位监测,采用综合营养指数法,对监测水域进行了富营养化特征研究和现状评价。结果表明:研究水域水质具有明显的季节性特征,春季总氮(TN)、总磷(TP)含量最高,分别达到107 mg/L、0.17 mg/L;夏季叶绿素a含量和高锰酸盐指数最高,分别为98.31 mg/m^3和11.82 mg/L;运用综合营养状态指数法分析表明,7个监测点的全年平均综合营养状态指数法(TLI)>70,研究水域整体处于重度富营养化状态,其中3~7月富营养化程度最重,月平均TLI>70,为重度富营养化水平;2015年8月~2016年1月均60<TLI<70,为中度富营养化水平。

Fengnan section of the Tangjin canal, belonging to the outskirt of Tangshan river and wetland was selected to be the research object and was analyzed by the comprehensive trophic level index（TLI） method based on the eutrophication monitoring data of one year. The results showed that the water monitored had obviously seasonal characteristics, with the highest concentration of TN and TP reaching 107 mg/L and 0.17 mg/L in March, while the peak of Chl. a and CODMn, being 98.31 mg/m3 and 11.82 mg/L in July. Moreover, the comprehensive trophic level index pointed that the observed water was in a state of severe eutrophication with the TLI of 7 monitored points being more than 70, when the period of March to July was the most serious, the TLI of each month being more than 70, which belonged to severe eutrophication ; the period of August to January next year was lighter, the TLI of each month being between 60 and 70, which belonged to moderate eutrophication.