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根据2004-2012年对渤海湾生态监控区进行的水质监测得到的数据,对该海域的无机氮(DIN)、磷酸盐(P0_4-P)以及N/P值的水季变化特征展开了分析。结果表明,渤海湾近岸海水中DIN、PO_4-P年均浓度整体呈上升趋势,超过国家一类海水水质标准,DIN、PO_4-P已成为影响近岸海域水质的主要污染物。运用有机污染评价指数法、潜在性富营养化评价法、营养指数法分别对渤海湾近岸海域营养状况进行评价得出的富营养化评价结果基本相同,均表明渤海湾天津近岸海域正处于富营养化状态。
According to the data of monitoring the water quality in the Bohai Bay Ecological Monitoring Area from 2004 to 2012, the characteristics of watery seasons of inorganic nitrogen (DIN), phosphate (P0_4-P) and N / P in this area were analyzed. The results showed that the average annual concentrations of DIN and PO_4-P in coastal seawater of Bohai Bay showed an overall upward trend, exceeding the national first-class seawater quality standards. DIN and PO_4-P have become the major pollutants affecting the water quality of coastal waters. The eutrophication evaluation results of the assessment of nutrition status in the coastal areas of the Bohai Bay using the organic pollution evaluation index method, the potential eutrophication evaluation method and the nutrition index method are basically the same, all of which show that the coastal areas of Tianjin in the Bohai Bay are in the Eutrophication state.