海州湾营养盐空间分布特征及影响因素分析

The Recognition of Characteristics and Pollution Sources of Nutrients in Haizhou Bay

根据2009年12月覆盖海州湾的33个站位的调查资料,分析了海州湾海域营养盐的空间分布特征,通过地统计分析探讨了营养盐的主要污染来源及其特征,并采用富营养状态质量指数进行了评价。结果表明:营养盐要素的站位空间聚类划分为南北两侧共7类区域,近岸区域的划分表现出明显的入海河口控制特征,离岸区域受到了外海潮流和入海河口的综合影响。无机氮平均含量为524.42(121.75~1 083.65)μg/L,活性磷酸盐为19.98(3.47~36.10)μg/L,富营养化水平以临洪河口为中心向外由富营养向贫营养过渡的趋势,具有明显的空间变异特征,营养盐表现出磷限制性特征。来源分析表明海州湾营养盐主要来源于临洪河口的陆域入海污染影响,潮流动力和地形地貌特征控制了营养盐的扩散。

The aim is to identify the characteristics of water quality in Haizhou Bay and provide reference for protection and management. Based on the environmental investigation carried out in December 2009, the main pollution source characteristics and distribution were examined with factor analysis, the stations were categorized based on cluster analysis and the characteristics of various types of survey stations were analysed,nutrient quality index(NQI)was employed to assess the eutrophication degree of Haizhou Bay. The result indicated the nutrient of Haizhou Bay has definite spatial distribution and feature.That regional differences were obvious in pollution status between the north and south of Haizhou Bay, the stations could be divided into seven types due to the influence from estuaries and the tidal current. The contents of DIN and PO_4-P were 121.75~1 083.65、3.47~36.10 μg/L, respectively. The status of eutrophication showed a landward as well as northeastward increasing trend, N/P indicated the feature of P-limiting.