浙江南部海域富营养化和赤潮的探讨

本文探讨了浙江南部海域1990年春季发生赤潮期间的水化学特征和富营养化状况,及与赤潮生物的线性回归关系。分析结果表明,该海域出现高营养盐以至形成富营养化乃是江浙沿岸流和瓯江等河流径流及远岸区盐度锋辐聚的综合影响的结果。根据回归分析,NO_3-N,SiO_3-Si与浮游植物细胞密度之间存在着较为显著的负相关。亦即N,Si和高N/P比(35:1左右)可能是导致浮游植物(夜光藻)异常增殖的重要因素。

The preliminary study on the eutrophication and the red tide in the south coastal area of Zhejiang

In this paper, the aquatic chemical characteristics, eutrophic state and its relation with phytoplankton cell were disccussed, in the south coastal area of Zhejiang, during the red tide generated in the spring, 1990. The results show that the high content of the nutrients and eutrophication, emerged in the south coastal area of Zhejiang, are affected by Jiangzhe longshore current and the runoffes from the Oujiang River etc. and the salinity front in the offshore area. According to the regression analysis, there are clearer positive linear relationshipes between NO3-N, SiO3-Si and phytoplankton cell density. It is that N and Si and the high N / P ratio (about 35 : 1) may be the important factor resulting in the abnormal proliferation of the phytoplankton (Noctiluca scintillans) .