关键词: 浮游植物, 闽江口, 群落结构, 环境因子, phytoplankton, Minjiang Estuary, community structure, environmental factors

Abstract: The present study reported on the community structure of phytoplankton and its relationship to the environment factors, based on phytoplankton water samples collected in southern part area of Minjiang Estuary from 2011 to 2014 in summer. A total of 193 species belonging to 51genera (4 phyla ) of phytoplankton in survey area were indentified. Diatom was the major phytoplankton group. The annual average cell abundance of the phytoplankton varied from 1.20×105 to 3.87×105 individual /dm3. Horizontal distribution of phytoplankton cell abundance showed a trend of decreasing gradually from inshore to offshore, inner to outer bay. But the horizontal distribution of phytoplankton biodiversity Shannon-Wiener diversity index was on the contrary of that of phytoplankton cell abundance. Statistical analysis showed that the variations of phytoplankton cell abundance were positive correlated obviously with the concentrations of silicate, phosphate, ammonia, nitrate and nitrogen. The phytoplankton growth was mainly limited by ammonia concentration, and Secondly by the nitrate concentration.