浙江三门湾秋季浮游植物群落结构特征及其影响因子分析

Analysis of Structural Characteristics of Phytoplankton Community and Influencing Factors in Sanmen Bay of Zhejiang Province in Autumn

东海三门湾海域渔业和养殖业发达,其浮游植物现状和水质对地区渔业发展意义重大,在2018年9月对该海域的浮游植物和水环境进行了调查研究,结果表明,水体中pH、DO、COD等指标符合海水Ⅰ类水质标准,但是此海域无机氮和有机磷严重超标,海水富营养化趋势明显;此外,三门湾海域浮游植物以硅藻和甲藻为主,浮游植物优势种主要有3种,分别是中肋骨条藻、琼式圆筛藻和叉状甲藻。浮游植物密度为1373个/L。相关性分析显示,中肋骨条藻的丰度与水体中的反应性磷含量和透明度呈现显著的正相关关系。

The fishing and aquaculture are flourishing along the Sanmen Bay,and their phytoplankton status and water quality are of great significance to the development of regional fisheries.In September 2018,a survey and study of the phytoplankton and water environment in the sea area was conducted.The results showed that the pH,DO,COD and other indicators in the water conformed to the water quality standard of seawater,but the inorganic nitrogen and organic phosphorus in this area were seriously exceeding,and the trend of seawater eutrophication was obvious.In addition,phytoplankton in Sanmen Bay were dominated by Bacillariophyta and Pyrrophyta,and there were three dominant species of phytoplankton,namely Skeletonema costatum,Coscinodiscus jonesianus and Ceratium furca.The density of phytoplankton was 1373个/L.Correlation analysis showed that the abundance of Skeletonema costatum showed a significant positive correlation with the reactive phosphorus content and transparency in the water.