天津近岸海域水体富营养化特征及健康状况分析

TIANJIN COASTAL EUTROPHICATION CHARACTERISTICS AND ANALYSIS OF HEALTH STATUS

根据2008—2011年天津近岸海域的调查结果并结合历史资料,分析了该海域受到的有机污染、营养盐污染、水体富营养化状况随时间尺度发生的变化及其空间分布趋势,并按照《近岸海洋生态环境健康评价指南》进行了健康状况评价。结果表明,天津近岸海域COD值未超过国家一级水质标准,但其富营养化程度高,海水一直受到无机氮的污染,处于严重的富营养化状态,易发生赤潮。COD值、营养盐含量的平面分布均为近岸大于外海。天津近岸海域整体水质情况和沉积物状况较好,达到健康标准;生物状况不理想,表现为不健康。

According to the survey results of 2008 - 2011 in Tianjin coastal waters and combining with history data, analysis of the sea area by the organic pollution, eutrophication, water body eutrophica- tion status with time scale change and its spatial distribution trend, and in accordance with the ＂The guidance for the assessment of coastal marine ecosystem health＂ on the health status evaluation. The results show that, Tianjin coastal waters COD value does not exceed the national standard of water quality, but the eutrophication degree is high, the sea was the subject of inorganic nitrogen pollution, a serious eutrophic state, prone to red tide. The plane distribution of nearshore COD value and nutrient content are greater than offshore. Tianjin Inshore water quality and sediment condition are better and meet the health standards; biological situation is not ideal, the performance is unhealthy.