【摘要】 <正> 洱海位于云南省西北部,距昆明市418公里的大理州境内,是我国著名的高原淡水湖泊之一。面积达249.76平方公里,湖面海拔1974.0米,平均水深10.2米,最大水深20.7米,容积为25.4亿立方米,是属于构造型断陷湖泊。以前曾有人对该湖进行过调查,我们在前人工作的基础上,为了进一步了解洱海水生植物资源状况于1981年11月,1982年4、5、12月和1983年1月,分别对该湖的水生植物种类、分布、植被类型及其生产量作了调查和分析,现将结果报告如下。更多还原

【Abstract】 Erhaihu lake is one of larger fresh-water lakes in Yunnan plateau of china with area 249. 6 km~2, maximum depth 20. 7m and average depth 10. 2m. The species, dist- ribution, yield, vegetational types and successions of the hydrophytes of Erhaihu lake were investigated in period of 198l--1983. A total of 32 species of the hydrophytes have been collected the main species of which are as folows: Potamogeton maackia nus, Ceratophyllum demersum, Hydrilla verticillata and vallisneria spiralis etc. The yieds of the hydrophytes are about 799000 ton (i. e. fresh weight). The aquatic vegetation of Erhaihu lake may be classified into nine types, namely Potamogeton maackianus + Ceratophyllum demersum community, vallisneria Spiralis comm- unity, Myriophyllum spicatum community, Potamogeton pectinatus community, Potamog- eton maackianus+ Hydrilla verticillata community, Potamogeton malaianus community, Azolla imbricata community, Zizania caduciflora community and Phragmites communis community, etc. The successions of the hydrophytic community in Erhaihu lake have the charac- ters existing both in deep lake and shallow lake. The ecologic characteristics in the hydrophytes indicated that Erhaihu lake is into older stage.更多还原