2007～2008年对洪泽湖水生植物的种群、分布、生物量等进行了1次全湖调查和4次补充调查。结果表明,洪泽湖现有水生植物15科25种,马来眼子菜、芦苇、荇菜为优势种;共有5个主要的植被类型,分别是芦苇群丛、荇菜群丛、马来眼子菜群丛、荇菜+马来眼子菜群丛、荇菜+苦草群丛;植物在整个水域的分布表现为沿湖岸向湖心3.5km范围内呈明显带状分布格局,但在此范围外的水域,分布格局呈不规则的斑块状;水生植物生物量和多样性与TN呈负相关关系。从1953年三河闸建成以来,水生植物种类减少,种群开始向单一化发展,某些对水质敏感的种类逐渐减少甚至消失;1993～2008年,洪泽湖水生植被面积减少375.16km2;水利工程修建、营养负荷增加和围网养殖过度发展是导致水生植物种群变化的最主要因素。

One comprehensive investigation and four further additional investigations on the macrophyte species,distribution and biomass in Hongzehu Lake had been performed from 2007 to 2008.The results showed that 25 macrophyte species in 11 families present in the lake.Potamogeton malaianus,Phragmites communis and Nymphoides peltata were the three dominant species in the lake.Ass.Phragmites communis,ass.N.peltata,ass.P.malaianus,ass.N.peltata-Potamogeton malaianus,ass.N.peltata-Vallisneria spiraslis were the main five vegetation associations.Within about 3.5 km distance from the lake shore in the vegetation presents area,the vegetation distribute nearly banded.Outside this range to the center of lake,the vegetation formed irregular patches.The result showed the negative correlation between the vegetation biomass and TN in the water.The number of species decreased and the continuous regression of the community in the lake since Sanhe sluice gate constructed in 1953.Compared with the documented history data,the vegetation area within the lake diminished 375.16 km2 from 1993 to 2008.Water project construction and overfishing in the lake is the main reason contributed to the macrophytes variation in Hongzehu Lake during the half past century.