2016年乐清湾北部海域富营养化现状与评价*

于2016年4月和7月在乐清湾北部海域进行海洋环境调查,依据富营养化状态评价原则和营养状态指数(E)对乐清湾北部海域的富营养化现状进行评价。结果表明,NO3--N和NH4+-N是乐清湾海域无机氮的主要存在形式。乐清湾北部海域富营养化程度严重,整体处于磷中等限制潜在性富营养至磷限制潜在性富营养状态。究其原因是海湾位置结构、沿岸城镇带来的生产生活污水及水产养殖的规模及密度大。

Status and analysis of eutrophication in the sea area near North of Yueqing Bay in 2016 *

According to the marine environment survey conducted in the northern part of Yueqing Bay in April and July 2016, the eutrophication status of the northern part of Yueqing Bay was evaluated by the eutrophication evaluation principle and the nutritional status index (E).SThe results show that NO3-N and NH4-N are the main forms of inorganic nitrogen in the Yueqing Bay. The eutrophication of the northern part of Yueqing Bay is serious. The overall exposure to phosphorus limits the potential for nutrient-phosphorus restriction to a potentially eutrophic state.The reason is the location structure of the bay,production and domestic sewage brought by coastal towns and the scale and density of aquaculture.