关键词: 浮游植物, 群落结构, 季节变化, 多样性, 环境因子, phytoplankton , community structure , seasonal variation , diversity , environmental factor

Abstract: Investigations on phytoplankton community and environmental factors were carried out in Minjiang Estuary of Fujian , in May (spring) and November (autumn) of 2009 . The total 129 species in 54 genera were found out in this sea area . Taxonomically , 118 species in 46 genera were Bacillariophyta , accounting for 91% of all species ; 8 species in 5 genera were Pyrrophyta , accounting for 6% ; 1 species in 1 genus was Cyanophyta , accounting for 1% ; 1 species in 1 genus was Chlorophyta , accounting for 1% ; 1 species in 1 genus was Cryptophyta , accounting for 1% . The dominant species in spring were Skeletonema costatum , Chaetoceros curvisetus and Chaetoceros debilis ; and the dominant species in autumn were Skeletonema costatum , Coscinodiscus subtilis and Coscinodiscus jonesianus . The cell abundance of phytoplankton ranged from 1.56×103 to 7.43×105cell/L . The abundance of phytoplankton was significantly correlative to the water temperature and chlorophyll-a concentration in spring . However , There were significant negative correlation of phytoplankton abundance to salinity，and positive corelations of phytoplankton abundance to DIN concentration in autumn .