近10年南通市近岸海域功能区生物状况分析

通过对南通市2006—2015年近岸海域功能区生物环境状况监测和分析,功能区海水基本处于贫至中营养状态,营养指数呈先降后稳再升的变化趋势。底栖生物物种较少,多样性指数波动中呈轻微下降趋势。浮游生物中,浮游植物多样性指数较为稳定,浮游动物年度间波动起伏差异较大。从优势种来看,优势比例明显,浮游植物以硅藻门为主,中肋骨条藻作为主要优势种占据多年;浮游动物以浮游甲壳动物为主,真刺唇角水蚤等河口半咸水种和近岸低盐物种较多,应引起重视。

The Creatures Analysis on the Functional Zone of Offshore Area in Nantong for Recent Decade

Based on the monitoring and analysis of the creatures in the offshore area of Nantong during 2006—2015 ,it is con-cluded that the seawater was basically in the state of poor or medium nutrient level and the trophic level indexes decreased first,then remained stabale ,and a decreasing trend followed at last .The benthos species were paucity ,the diversity index of the benthos showed a slightly declining .The phytoplankton species were stable ,but the zooplankton was rather significant changed during these years .Analysing the dominant species , those dominant species own obvious advantages on proportion , the main type of benthos was the bacillariophyta ,the skeletonema costatum was the main dominant species in many years .In the zoo-plankton the main type was the planktonic crustacean .The estuarine brackish species and coastal low salt species just as labi-docera euchaeta were more ,it should be emphasized .