湖湾效应对长江中游湖泊水生植物多样性的影响

LAKE BEND EFFECT AND ITS INFLUENCE ON THE SPECIFIC DIVERSITY OF AQUAIC PLANTS IN THE LAKES OF MIDDLE BASINS OF CHANGJIANG RIVER

在３ａ野外调查和定位研究的基础上，本文对长江中游地区水生植物物种多样性进行了初步研究。主要工作在１０个有代表性的湖泊进行，结果表明：湖泊水生植物多样性指数沿湖湾至中央敞水区由２．１６５５降至０．３６３３；植物种类和个体数自湖湾至湖心区急剧减少，植物群落生物量自湖湾至湖中央区也发生明显变化；水深梯度与植物种类分布密切相关，在保安湖０．５ｍ水深中有１９种植物，在２ｍ水深中仅有４种植物，绘出３个湖的种－面积曲线，比较了消落区中植物区系的演变；试提出“湖湾效应”现象并就其对湖泊生物多样性的影响进行探讨；并讨论了湖湾的特点及人工干扰对水生植物多样性的影响。

Based on the results obtained from field studies for three years, the specific diversity of aquatic plants in the lakes of middle basins of Changjiang River was studied, including diversity index of aquatic plants in six typical lakes, the changes of the number of species and plant's individuals from lake bend to mid-lake, the relationship between the water depth and the distribution of plant belonging to different ecological types, the species-area curve of three lakes, the succession of the flora of plant in ecotones.Lake bend effect was put forward and its influence on the biodiversity was also explored.The rechness and evenness of plants in two lakes were measured.