在2009年6月对黄海南部及中部海域30个站位进行综合调查，对获得的131个浮游植物样品用Utermohl方法进行初步分析，共鉴定浮游植物4门51属73种（不包括未定名种），其中硅藻32属47种（不包括未定名种），甲藻17属24种（不包括未定名种），定鞭藻1门1种，蓝藻1门1种，硅藻在物种丰富度上占有优势。浮游植物的生态类型主要以温带近岸种为主，优势物种为具齿原甲藻（Prorocentrum dentatum），柔弱伪菱形藻（Pseudo—nilzschia delicatissima）、具槽帕拉藻（Pa%One hundred and thirty-one water samples were collected from the South Yellow Sea in June 2009. This paper presents the preliminary study on phytoplankton community structure by the Uterm6hl method. A total of 4 phylum and 51 genera including 73 species （exclusive of uncertain species） were found, which were mostly composed of diatom and dinoflagellates, with the major group being diatom. There were 32 diatom genera that include 47 species. The dominant species included Prorocentrum dentatum, Pseudo-nitzschia delicatissima, and Paralia sulcata. The phytoplankton cell abundance was ranged 0.089×10^3～1045.200×10^3cell/L, with an average of 15.941 × 10^3 cell/L, with dinoflagellates being dominant. Horizontally, the high cell abundance was located at the southern of the survey area, and low in the northwest part. Vertically, the phytoplankton, mainly P. dentatum, were concentrated in the 10-m layer water and decreased with the increase of the water depth. The horizontal distributions of Shan- non-Winener index and Pielou evenness index were low in the southern survey area, and were contrarily with phytoplankton cell abundance.
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