红海湾水质营养状况分析

Water quality assessment on nutrient status in Honghai Bay, South China Sea

根据 1997年 8月～ 1998年 11月的调查数据 ,分析红海湾水域的营养水平及分布特点 ,以了解红海湾水域营养水平的分布特点及污染状况。红海湾水域的富营养化指数E的分布从北向南呈逐渐递减趋势 ,即长沙湾滩涂养殖区 >长沙湾浅海养殖区 >自然水域、龟龄岛水域 ,其中长沙湾滩涂养殖区和长沙湾浅海养殖区受污染明显 ,分别达高富营养化程度和富营养化程度 ;自然水域和龟龄岛水域则营养状况相似 ,基本上未受到明显的污染。E的季节变化趋势为春季 >秋季 >夏季 >冬季 ,除冬季处于贫营养状况外 ,其余 3个季节均达富营养化程度 ,其中以春季受到的污染最为严重 ,达高富营养化程度。分别根据CN/CP

Honghai Bay is located at north of South China Sea, 115°5′～27′E, 22°39′～51′N. An investigation was conducted from Aug.1997 to Nov.1998 to research the nutrient status in the bay for its importance in saltwater aquaculture. Using eutrophication index E as the assessment standard, the results show that from north to south, the eutrophication degree decreases gradually, and the pollution is obvious in the sea beach and shallow water culture areas, where eutrophication degree is high. But in natural water area, pollution is not obvious. In terms of E value, except winter, the water quality shows eutrophication all the year, especially in spring. The calculated results from C N/C P and E have the same conclusion.