PRELIMINARY STUDIES ON ECOLOGICAL DISTRIBUTION OF MICROORGANISMS IN WEST LAKE, HANGZHOU 2. Microorganisms in sediment
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The abundance and distribution of microorganisms in the upper-layer sediment of West Lake were studied. Results showed that aerobic heterotrophic bacteria were 2.01 x 10⁵/g and actinomycetes were 1.83 x 10⁴/g on average. Both were more abundant in L. Yuehu. While the bacteria had negative correlation with the surrounding water temperature, actinomycetes had positive correlation. Aerobic cellulose decomposing bacteria were 1.88 x 10³/g on average, and more abundant in L. Xili and L. Yuehu L., peaking in July and May. Nitrite bacteria, nitrate bacteria, nitrate reducers and denitrifiers were 2.75 x 10⁵/g , 1.81 x 10⁵/g, 1.23 x 10⁵/g and 3.14 x 10³/g on average, respectively. Organic phosphorus decomposing bacteria were 2.38 x 10³/g on average, while calcium phosphate dissolving bacteria were very low. About 50.4% of heterotrophic bacteria were found to be Bacillus and about 23.9% were Enterobacteriaceae. Remain about 25.7% consisted of 11 other minor bacteria genus.
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