The ecological environment succession of East Taihu Lake was analyzed for years past 40. With the passage of time, the water quality becomes worse gradually; trophic status shows transition from meso-eutrophic type to near eutrophication. Thickness of sediment raises gradually and tends to form marsh markedly. Density of algae increases continuously with species decreased; plankton and fish tend to be markedly less. Potamogeton malialaianus was dominant in submerged plants in 1950s; but the rate to form swa...
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