九段沙湿地水域典型污染物的分布格局与动态

Distribution Patterns and Dynamics of Typical Pollutants in the Waters of Jiuduansha Wetland

2015-2017年监测了九段沙湿地水域典型污染物COD、无机氮、总氮(TN)、活性磷(AP)、石油烃和重金属。结果表明:九段沙湿地石油烃属于点源排放,重金属含量很低,其它典型污染物含量在长江口上游高于下游,落潮时高于涨潮时,低平潮时高于高平潮时,枯水期高于丰水期,秋冬季节高于春夏季节。九段沙水质好于黄河三角洲湿地,但整体污染比较严重。九段沙湿地污染物主要来自上游,湿地对污染物具有一定的截留作用。

Long-term monitoring of typical pollutants in the waters around Jiuduansha wetland, including COD, inorganic nitrogen, total nitrogen （TN）, active phosphorus （AP）, petroleum hydrocarbons and heavy metals was conducted from 2015 to 2017. The results showed that petroleum hydrocarbons belong to point source emissions and heavy metal contents was quite low. The other typical pollutants in the upstream of Yangtze River estuary were higher than the downstream, flood water quality was better than that of ebbtide. Additionally, in wet season of spring and summer, water quality was better than that in dry season of autumn and winter. The Jiuduansha wetland water quality is better than the Yellow River Delta wetlands, but the overall pollution is more serious. Pollutants of Jiuduansha wetland waters mainly come from the upstream, and the wetlands have a certain ability to intercept pollutants.