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The research on community structure and species diversity of planktonic algae in Bailianjing,Shanghai Expo Garden

CHEN Li-jing1,GU Jing1,ZHANG Yin-jiang2,PENG Zi-ran2,HE Peiming1 (1.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources,Shanghai Fisheries University,Ministry of Education,Shanghai 200090,China; 2.Key Laboratory of Aquatic Genetic Resources and Aquacultural Ecology Certificated by the Ministry of Agriculture,Shanghai Fisheries University,Shanghai 200090,China)  
The ecological environment in Shanghai Bailianjing is the key construction project of planning area of Shanghai World Expo in China in 2010.The community of planktonic algae was investigated in Bailianjing from March to September in 2006.The species diversity and mutual relations of planktonic algae with physico-chemical parameters of water were analyzed.The results showed that there were 181 species planktonic algae in Bailianjing which belong to 7 phyla,82 genera.Dominant species were Microcystic flos-aqua,M.aeruginosa,M.incerta,Lyngbya limnetica,Oscillatoris princes,Phormidium tenue and Cyclotella stelligera.The annual average density of planktonic algae was 21.034 8×104 ind./L and the annual average biomass of planktonic algae was 4.027 mg/L.The value of Shannon-Wiener diversity index,Margalef diversity index and Pielou index were 0.94-2.47,0.58-2.75 and 0.39-0.78 respectively.The average density of planktonic algae was 17.60×104 ind./L in flood tide and 24.78×104 ind./L in ebb tide.The average biomass of phytoplankton was 0.775 mg/L in flood tide and 1.569 mg/L in ebb tide.
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