长江口及邻近海域夏季浮游植物分布现状与变化趋势

Distribution status and change tendency of phytoplankton during summer in Changjiang Estuary and adjacent waters

根据2000~2003年夏季4个航次的调查数据,对长江口及邻近海域浮游植物数量分布状况及变动趋势进行分析和探讨。结果表明:舟山渔场西部浮游植物平均细胞数最高(12 332.30×104/m3),长江口次之(3 961.38×104/m3),杭州湾水域最低(569.11×104/m3),长江口水域年间出现高值(1 000×104/m3)的稳定性明显高于舟山渔场和杭州湾;长江口(122°30′E以西)7月径流量变化是导致8月浮游植物总量年间变化的主要因素之一。浮游植物优势种群从单一种数量优势向多种群数量优势的方向发展,以往单峰型的季节变化和单一种主导浮游植物总数量分布的格局将有所改变。

According to the data from the four investigations in summer during 2000 to 2003,the distribution and change tendency of phytoplankton was analyzed and discussed.The result showed that the average value of phytoplankton in the west of Zhoushan fishing ground(12 332.30×104 /m3)was the highest among the three parts of investigation waters,the second highest value appeared in Changjiang river estuary(3 961.38×104 /m3),and the lowest value appeared in Hangzhou bay(569.11×104 /m3),but the frequency of high value...