长江口九段沙附近水体浮游植物的种类组成与数量分布

Species composition and quantitative distribution of phytoplankton near the Jiuduansha waters of Yangtze River estuary

2005年9月对吴淞口至九段沙下沙近海水域的水体进行了浮游植物调查,结果表明,此调查区域共有浮游植物70属135种．其中硅藻种类最多,共42属82种,占总种数的60．8%;绿藻门14属24种;其他藻类14属29种．浮游植物的数量分布表现为:从吴淞口至江亚南沙段较低,九段沙上沙、中沙段显著高于其他采样点,在九段沙下沙近海水域出现了急剧下降的趋势．中肋骨条藻(Skeletonema costatutm(Grev．)Cleve)是调查区域的优势种,其数量占浮游植物总数量的平均百分比达到了71．8%．作者还对该区域浮游植物数量分布的影响因素进行了讨论．

The phytoplankton between Wusongkou and Lower Jiuduanaba of Yangtze River estuary was investigated in SOp.2005. 135 species of phytoplankton belonging to 70 genera were found in the survey area. The species of diatom, including 82 species in 42 genera, was the most and took 60.8% of all species. Green algae involving 24 species in 14 genera and 14 genera of other algae were also detected. The quantitative distribution of phytoplankton in the sampling sites in Upper Jiuduanaba and Middle Jiuduansha were more abundant than other sites, and that decreased sharply in the Lower Jiuduansha sampling sites. Skeletonema costatum （Grey.） Cleve was the dominant species and took about 71.8% of the total quantity of phytoplankton. Some factors which affected distribution of phytoplankton quantity were also investigated in this paper.