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根据1997年、2000年、2005年和2010年四个时段的渤海海域水质监测资料,选用富营养化指数法对渤海海域的富营养化现状及变化趋势进行了评价。结果表明,2010年夏季呈富营养化状态的渤海海域面积约14 080 km2,重度富营养化海域主要集中在辽东湾、渤海湾及大连近岸。1997～2010年,渤海的富营养化状况逐渐恶化,总面积由110 km2增至14 080km2。辽东湾的富营养化程度和面积均呈加重趋势,至2010年已有大面积区域处于重度富营养化状态;位于渤海湾底部的天津近岸海域自2000年以来始终处于重度富营养化状态;大连近岸海域2010年出现了较严重的富营养化现象,尤其是复州湾和普兰店湾呈现较大面积的重度富营养化区域。
According to the monitoring data of water quality in the Bohai Sea for 1997, 2000, 2005 and 2010, eutrophication index method was used to evaluate the eutrophication status and trend of the Bohai Sea. The results showed that the area of the Bohai Sea with an eutrophic state in summer 2010 was about 14 080 km 2, while the areas with severe eutrophication were mainly concentrated in Liaodong Bay, Bohai Bay and Dalian nearshore. From 1997 to 2010, the eutrophication of the Bohai Sea deteriorated gradually and the total area increased from 110 km2 to 14 080 km2. The degree and area of eutrophication in Liaodong Bay tended to increase. By 2010, a large area had been in severe eutrophication. The coastal waters off Tianjin at the bottom of Bohai Bay had been in severe eutrophication since 2000. Dalian coastal waters in 2010 there was a more serious eutrophication, especially in the Gulf of Pizhou and Pulandian Bay showed a large area of severe eutrophication.