The population distribution of microorganisms in the water body of West Lake was studied from Apr.1995 to Apr.1996.Results showed that:(1) The density of heterotrophic bacteria were 2 06×10 3/ml on the average.Actinomycetes,molds and yeasts were 35/ml,24/ml and 2/ml respectively.(2)The coliform index in the Xili and Yuehu L.were 23 800/L,and those in the other sub lakes were lower.(3)Various physiological groups of microbes were found in West Lake,including cellulose decomposing bacte...