SPATIAL-TEMPORAL DISTRIBUTION OF PHYTOPLANKTON IN BLOOM-ACCUMULATION AREA IN LAKE CHAOHU

The results from the western region of Lake Chaohu indicated that cyanobacterial blooms mainly accumulated in the lakeside zone.The area where large amounts of algal blooms mainly accumulated were chosen to monitor the spatial and temporal distribution of phytoplankton,and the correlation between phytoplankton biomass and physical and chemical factors was analyzed.The results showed that the biomass distribution of water blooms would be susceptible to wind direction and weather conditions.Chlorophyll a content was significantly correlated with total nitrogen(TN),total phosphorus(TP) and chemical oxygen demand(CODMn)(p0.01).The biomass of Microcystis species almost accounted for more than 95% of the total water blooms,and the closer to the lakeshore the greater the biomass proportion of Microcystis species.Accordingly,the accumulation area of water blooms could be chosen as key areas for removing cyanobacterial blooms to effectively reduce pollutions,so as to create requirements for ecosystem restoration.