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本文对2011年内采自我国长江口以北渤海和黄海近岸海域11个站住67个表层沉积物样品进行硅藻鉴定分析,共鉴定出硅藻118个种和变种,隶属于30个属。主要以近岸广布种为主,海水种和半咸水种占绝大多数。硅藻平均丰度为7198粒/g,其中渤海为4674粒/g、黄海北部为22427粒/g、黄海西部为6342粒/g,总体明显低于长江口以南近岸海域。根据硅藻优势种和次优势种的分布特征,在长江口以北近岸海域共划分出6个硅藻组合和2个亚组合。
In this paper, 67 surface sediment samples collected from 11 stations in the Bohai Sea and the Yellow Sea coastal areas north of the Yangtze River Estuary in China were analyzed for diatoms in 2011. A total of 118 species and varieties of diatoms were identified, belonging to 30 genera. Mainly in the coastal broad-based species, seawater species and brackish water species accounted for the vast majority. The average abundance of diatoms was 7198 grains / g, of which 4674 grains / g in Bohai Sea, 22427 grains / g in northern Yellow Sea and 6342 grains / g in western Yellow Sea, which were obviously lower than those in the coastal waters south of the Yangtze Estuary. According to the distribution characteristics of diatom dominant species and sub-dominant species, six diatom assemblages and two sub-assemblages were divided in the north coastal waters of the Yangtze Estuary.