莱州湾西部海域枯水期富营养化程度研究

Eutrophication assessment in western sea area of Laizhou Bay in dry-period

根据2004年5月份的调查资料,选择透明度、盐度、活性磷酸盐、溶解无机氮、硅酸盐、叶绿素a、浮游植物、浮游动物、底栖生物作为评价因子,利用层次分析法确定了各因子的层次关系和权重,建立了以营养盐和富营养化症状为基础的综合评价指数模型,对莱州湾海域的营养水平进行了评价。各站点最终评价结果表明:莱州湾海域磷酸盐、无机氮超标严重,整体已表现出富营养化,其中黄河口和小清河口附近富营养化较为明显,这主要是受到陆源排污和海水养殖的影响,基本符合实际情况。

Based on the survey data of salinity, Chl-a, SiO4^-2 , phosphate, DIN, phytoplankton, zooplankton etc. in Laizhou Bay in May, 2004, the assessment factors for the eutrophication in the coastal waters, and the models for the comprehensive evaluation were established. The assessment and classification of the nutrient levels were done by the mathematical model. The results show that Laizhou bay was seriously polluted by phosphate and DIN, and the part was at the stage of eutrophication, especially out of the yellow river and Xiaoqinghe River. The eutrophication was caused by the pollutants from the river and sea farms.