中文摘要：

运用PRIMER v6分析海南岛南部黎安湾内浮游植物群落短期变化特征,通过Brag-Curits相似性测定,建立等级相似性矩阵,分别用CLUSTER,BEST分析浮游植物群落结构与环境因子的关系,结果表明：黎安湾内共有浮游植物48属98种,丰度范围为7.92×10^5～7.5×10^6cells·L^-1,其中,硅藻门占总量的93%～99%,甲藻门占0～5%。优势种有小环藻（Cyclotella sp.）、柔弱根管藻（Rhizosolenia delicatula）、海链藻（Tharassiosira sp.）、菱形海线藻（Tharassionema nitzschioides）、丹麦细柱藻（Leptocylindrus danicus）、尖刺菱形藻（Nitzschia pungens）、刚毛根管藻（Rhizosolenia setigera）、中肋骨条藻（Skeletonema costatum）、圆筛藻（Coscinodiscus sp.）、脆根管藻（Rhizosolenia fragilissima）、盒形藻（Biddulphia sp.）等。浮游植物种类和数量随时间出现明显变化,2014-11-03—2014-11-15,黎安湾浮游植物群落结构相似度较高,但养殖区和非养殖区之间未呈现显著差异。浮游植物群落结构主要与透明度、盐度以及叶绿素a相关;此外,浮游植物群落结构短期变化受到热带潟湖独特的环境及当地即时的气候变化影响。

英文摘要：

Phytoplankton are significant producers in marine ecosystem,and are also important indicators in marine environmental monitoring work. The temporal variation of phytoplankton communities at Li ＇an Lagoon in Hainan was investigated,and total 98 species belonging to 48 genera were identified at the lagoon. The phytoplankton abundance ranged from 7. 92 ×10^5cells·L^-1to 7. 5 ×10^ 6cells·L^-1,and Bacillariophyta accounted for 93% ～ 99% of the total,while Pyrrophyta was 0 ～ 5%. The dominant species were Cyclotella sp. Rhizosolenia delicatula,Tharassiosira sp. Tharassionema nitzschioides,Leptocylindrus danicus,Nitzschia pungens,Rhizosolenia setigera,Skeletonema costatum,Coscinodiscus sp.,Rhizosolenia fragilissima and Biddulphia sp. Et al. It was found that the species composition and abundance of phytoplankton communities showed obviously different patterns within a month. PRIMER v6 CLUSTER identified an apparent similarity of phytoplankton communities from the samples during the period from November 3 to 15,2014,but without significant difference between the culture area and the non-culture area. PRIMER v6 BEST analysis indicated that water pellucidity,salinity and chlorophyll a were significantly correlated to the phytoplankton communities. Meanwhile,the phytoplankton community structure was also influenced by the distinctive tropical lagoon environment and the local instant weather.