淀山湖水生维管束植物群落的生物量及其季节变化

据１９９１年８月～１９９２年１２月对淀山湖水生维管束植物群落生物量的调查研究揭示：（１）群落单位面积生物量大小顺序为：挺水植物群落＞沉水植物群落＞浮叶植物群落＞漂浮植物群落；若以全湖总生物量计，沉水植物群落＞挺水植物群落＞漂浮植物群落＞浮叶植物群落。（２）不同生活型的水生植物，其生物量占群落比例随水深、群落类型而改变。（３）群落生物量随生长季推移逐渐增加，只是不同群落的生物量及其最大值的出现期各不相同。（４）沉水植物群落生物量的垂直分布可分为三种类型。（５）沉水植物根的生长依赖于底质和其生活史，大多数沉水植物的根仅占其总生物量的８％以下。

A Study on the Tiomass and its Seasonal Changes of Aquatic Vascular Plant Communities in Dianshan Lake

This paper was a study on the biomass of aquatic vascular plant communities from August,1991 to December, 1992 in Dianshan Lake. The results were as follows:(1) The community biomass per unit area was in the order: comm. emerged plant>comm. submerged one>comm. floating-leaved anchored one> comm. floating one, if arranged in the order of the total biomass: comm. submerged one > comm. emerged one > comm. floating one > comm.floating-leaved one. (2) The proportions of water plant biomass of different life form to the total biomass of communities were variable in different water depth. (3) The community biomass increased gradually with the growing season moving, but the biomass value and the period of the maximum biomass coming were different in the different communities. (4) In submerged plants, the biomass of roots that depended on the growing substrate and their life histories accountes for 8.0% less of the total plant biomass, and the vertical distribution of shoots biomass in the water body could be divided into three patterns.