论述了淀山湖水生植物的种类组成、分布特征、植被类型、生物量及其利用。淀山湖是上海市唯一的淡水湖泊，属中富营养化水平。水生植物共有１６科２１属２６种，优势种为苦草、菹草、马来眼子菜、芦、菰等。不同生活型的水生植物，其分布有一定的规律性，由湖岸至湖心依次为挺水植物带、浮叶植物带和沉水植物带。漂浮植物通常不形成独立的植物带。植被类型可划分为挺水植被、漂浮植被、浮叶植被和沉水植被４个亚型，包括９个主要植物群丛。全湖总生物量（鲜重）为１１６６３．４ｔ，单位面积生物量：挺水植物群丛＞沉水植物群丛＞浮叶植物群丛＞漂浮植物群丛。

Dianshan Lake is meso-eutrophic and is the only fresh-water lake in Shanghai. The species, distribution , vegetational types, biomass and its utilization of aquatic plants were investigated during 1991 - 1992. There are 26 species of aquatic plants, the dominant species are Vallisneria asiaticn, Polarnogeton crispus, Potamogeton malaianus, Phragmites communis and Zizania latifolia, etc. The distribution of aquatic plants exhibites irregular zonations and can be classified into 3 plant zones from the edge to the center of the lake. emerged zone, floating-leaves zone and submerged zone. No solitary zone is formed by the floating plants. The vegetational types can be divided into emerged, floating, floating-leaves and submerged sub-types which composed of 9 main aquatic plant associations. The total biomass (fresh weight) is about 11 663. 4 t, the order of biomass per square metre is emerged associations  > submerged ones > floating-leaves ones > floating ones.