红海湾水域营养水平的时空变化特点与评价

根据1997年8月～1998年11月的调查数据,本文分析和评价了红海湾4个不同水域营养水平的时空分布特点.红海湾水域E值的空间分布从北向南呈逐渐递减的趋势,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有机污染十分明显,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有机污染.E值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,其中以春季有机污染最为严重,达高富营养化程度.

Temporal-Spatial Distribution Characteristic and Evaluation of Nutrient Level in Honghai Bay

Based on the investigation data from August,1997 to November,1998, this paper analyses and evaluates the temporal spatial distribution characteristic of nutrient level in the four different waters in Honghai bay. From the north to the south, the spatial distribution of the E value shows a decreasing trend, that is, the sea beach culturing area of Changsha bay > the shallow water culturing area of Changsha bay > the natural waters and the Guilin Island waters.The organic pollution is obvious with a high degree of eutrophication and a degree of eutrophication in the sea beach culturing area and the shallowwater culturing area of Changsha bay, respectively. The nutrient status of the natural waters is similar to that of the Guilin Island waters, where the organic pollution are not obvious. The seasonal variation trend of the E value is Spring > Autumn > Summer > Winter. Except winter with a pool nutrient status, all the other three seasons reach to the degree of over nutrient among which the organic pollution in Spring is the most serious with a high degree of eutrophication.