Abstract:

Taking ecological reconstruction of Suzhou Creek as a research object,by setting six sampling points,Huangdu,Huacao,Beixingjing,Wuninglu Bridge,Changshoulu Bridge,Zhejinanglu Bridge,the survey of phytoplankton community structure was carried out.Nine samples according to the four seasons from October of 2000 to October of 2002 had been taken.Also,five more samples at Huangdu,Huacao,and Wuninglu Bridge from May to June of 2002 were added.Surveying items included species composition,dominant population,indicative species group and biomass.Through two years of intensive studies,following conclusions were drawn:the mean values of individual number,cell densities and biomass were 4.7×10⁶ ind/L，10.2×10⁶ ind/L and 5.73 mg/L,respectively.Chlorophyta always was the first dominance upon the generic number,species number,density,biomass of phytoplankton community in Suzhou Creek.Bacillariophyta was the second upon the generic number,species number,and biomass of phytoplankton community.The ShannonWeaver indices mean values of biomass,individual number and cell number were 3.05,3.22 and 3.28,respectively；The mean values of Pielou indices of biomass,individual number and cell number were 0.73, 0.76 and 0.77,respectively，and the mean values of Margalef and Simposon indices were 159 and 0.84

Key words: Suzhou Creek/ phytoplankton/ community structure