A Study on the Community Structure of Phytoplankton in Qingshan Lake,Nanchang

Phytoplankton community structure of Qingshan Lake in Nanchang was investigated from October 2010 to April 2011.The results showed that 8 classes including 110 species have been identified in Qingshan Lake,Nanchang.Among them,Chlorophyceae,39 species,predominated in species,accounting for 35.5% of the total phytoplankton species,Cyanophyta,25 species,is taken in the second place with a ratio of 18.18%,then,Bacillariophyta,20 species,accounting for 22.73% of the total phytoplankton species.The abundance of species changed significantly in different seasons.Chlorophyta abundance predominated in spring,summer and winter,howerve,Cyanophyta abundance kept higher during autumn.Moreover,there were significant differences in phytoplankton density in four different seasons.The abundance of phytoplankton in Qingshan Lake ranged from 0.58×105 to 4.33 ×cells/L,the maximum and minimum abundances of phytoplankton were found in autumn(on June 1rd) and in winter(on January 18th),respectively,and the average density of phytoplankton was 2.41×105 cells/L.