中文摘要：

2010年4月-2011年3月对烟台近海（四十里湾和套子湾）浮游植物群落结构时空变化特征展开了为期1年的双月调查.在28个站位的调查研究中,共发现浮游植物78属187种,其中硅藻50属103种,甲藻21属73种,褐胞藻5属7种,绿藻1属3种,未定类1种.硅藻在数量与物种组成上为主要类群,分别占浮游植物总量的97.3％与55.3％,其次为甲藻.浮游植物细胞丰度、多样性指数（H＇）和均匀度指数（J）呈现明显的季节特征：细胞丰度周年变动范围为0.6×104～156.7× 104 cells/L,最高峰出现在夏季（8月）,次高峰出现在春季（3,4月）;多样性指数（H＇）的周年变动范围是1.23～2.55,均匀度指数（J）的周年变动范围是0.28～0.68,两者在夏初（6月）和秋季（10月）较高.浮游植物优势种在夏季以硅藻-甲藻-褐胞藻联合为主,其余调查季节主要以硅藻为主.应用聚类分析分析了6个航次浮游植物群落结构的平面分布格局.四十里湾和套子湾细胞丰度在整个调查期间无显著差异,而在秋季（10月）和冬季（12月）存在显著差异.春初（3月）,四十里湾与套子湾浮游植物群落结构差异显著,其他调查季节两湾浮游植物并无显著差异.

英文摘要：

The research on the variation of temporal and spatial distributions of phytoplankton community in the coastal waters of Yantai （Sishili Bay and Taozi Bay） was bimonthly conducted during April 2010 to March 2011 in two bays.A total of 187 phytoplankton species belonging to 78 genera was identified from the samples of 28 sites.Among them,50 genera and 103 species were Bacillariphyta; 21 genera and 73 species were Dinophyta; 5 genera and 7 species were Heterokontophyta;1 genera and 3 species were Chlorophyta; there was one incertae sedis.Diatoms dominated in the abundance （97.3 ％） and species richness （55.3 ％）,followed by Dinoflagellates.There existed significant temporal variations in terms of cell abundance,Shannon-Weaver index （H＇） and evenness （J）：cell abundance ranged from 0.6 ×104 cells/L to 156.7×104 cells/L with a highest peak in summer （August） and a higher peak in spring （March and April）; Shannon-Weaver index （H＇）ranging from 1.23 to 2.55,and evenness （J） ranging from 0.28 to 0.68,were higher in June and October than those in other months.The phytoplankton community was characterized by Bacillariphyta species coexisting with Dinophyta and Heterokontophyta species in summer,and the phytoplankton community was mainly made of Bacillariphyta in other investigation scasons.The results of Cluster analysis were used to analyze the spatial distribution of phytoplankton community in 6 cruises.The cell abundance difference between Sishili Bay and Taozi Bay was not significant in the whole survey period,but it was Significant in autumn（October）and winter（December）.In early spring（March）,the phytoplankton community structure Was significantly different between Sishili Bay and Taozi Bay,while it was not significantly different in other investigation seasons.