Jinshuitan Reservoir is an important hydroelectric project in Oujiang River which is the second largest man鄄made river in Zhejiang Province. Its eco鄄environment and water management have a great significance on sustainable development of this area. With the fast economical development of the area, the water quality has been declined as an amount of pollutants discharged. Most of previous research works on Jinshuitan Reservoir watershed mainly focused on its meteorology, climatology and aquaculture, lacking of phytoplankton community structure, seasonal variation and water quality assessment. To explore the characteristics of the phytoplankton community structure and the response of water quality, which can provide database for its water utilization and protection, a survey was carried out every alternative month from January to November of 2010. Based on the analysis of phytoplankton samples from six sites in Jinshuitan Reservoir , the characteristics of community structure and abundance distribution were studied. Cell enumeration and species identification were performed by light microscope ( Olympus BX鄄 51 ) . The dominant population, species diversity and community structure of phytoplankton were determined as well. A total of 284 species in 105 genera and 7 divisions were identified, of which the most abundant group was Chlorophyta, with 139 species in 51 genera that account for 48. 94% of total species, followed by Bacillariophyta (67 species in 19 genera) , Cyanophyta (52 species in 22 genera) , Chrysophyta (9 species in 4
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