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The aquatic macrophytes and water environments in the enclosure aquaculture area and waterway of East Lake Taihu were investigated during 2006 and 2007. The results showed that there were ten species of aquatic macrophytes in the investigated area, among six submerged macrophytes, three emergent plants and one floating plant. The plant species were dominant by Ceratophyllum demersum, Myriophyllum spicatum and Elodea nuttalli in the enclosure aquaculture area, which are pollutant-resistant, regeneration-strong and purification-good macrophytes, while Potamogeton malaianus and Vallisneria spiralis were the dominant species both in the waterway and open water region. Aquatic macrophytes grew vigorously between summer and autumn and the maximum macrophyte biomass was in September when it could reach to 2882.4 ± 748.8g/m2. The biomasses of macrophyte in two enclosure aquaculture areas were 1251.2±1012.7g/m2 and 993.9±968.6g/m2, respectively, which were higher biomass than other water area. The physical factors in water, such as temperature, transparency and pH, had important influences on photosynthesis and seasonal growth of aquatic macrophytes. Through absorption of nitrogen and phosphorus nutrients and inhibition of algae growth by aquatic macrophyte in the water body, the water quality of East Lake Taihu had been improved. The patterns of aquatic macrophyte in the lake could also affect the temporal-spatial difference of water quality.

Aquatic macrophytes in East Lake Taihu and its interaction with water environment