Abstract:Two groups of aquatic plants dominated in East Taihu Lake during the field survey in 2002. The submersed macrophytes covered 73.6% of the lake surface, while the floating-leaved macrophytes covered 18.3%, respectively. After detailed classification, five mainly macrophyte asssemblages such as Elodea nuttalli (non-native species) association (30.7% of the total vegetation area of the waterbody), Ceratophyllum demersum association(17.2%), Elodea nuttalli-Potamogeton macckianus association (16.7%), Nymphoides ...