Responses of phytoplankton on phosphate enrichment in mesocosms
围隔生态系内浮游植物对富磷的响应

The correlation between the excess phosphate and biomass of phytoplankton and species composition was studied by mesocosm experiments in the water of Changjiang River Estuary.After adding the phosphate,the biomass of phytoplankton increased exponentially and the concentration of dissolved inorganic phosphate decreased exponentially until the fifth day.When the density of phytoplankton and the concentration of chlorophyll a reached the peak,the species diversity and evenness declined to the lowest.These two indexes were 0.008 and 0.003 respectively.The red tide of Skeletonema costatum was induced by adding phosphate.The growth rate of Skeletonema costatum and uptake rate on phosphate were estimated.