云贵高原典型湖泊富营养化演变过程及特征研究

选取滇池、洱海和抚仙湖3个云贵高原不同营养水平的湖泊,通过对其不同发展阶段的植物群落结构、水质类别、营养水平及流域人口和经济活动等进行研究,总结了云贵高原湖泊发展演化过程中的特征及差异性.结果表明：滇池、洱海和抚仙湖的植物群落结构、水质类别和营养状态均耦合良好,流域人口和经济活动是湖泊富营养化的重要影响因素.流域人口和...

Study on the evolution and characteristics of eutrophication in the typical lakes on Yunnan-Guizhou Plateau

Tien, Erhai and Fuxian lake are three typical lakes which have different nutritional status in Yunnan-Guizhou Plateau. The community structures, water quality and nutritional status, population and economic activity at different stages of development were analyzed to study the changing character of the Yunnan-Guizhou plateau. Our results show that plant community structures, water quality classes and nutritional status were coupled well in the three lakes. Population and economic activity were the important factors in the lake eutrophication process. Every increase in population and the level of economic activity led to an increase of nutritional status. Different types of lake have obvious differences in the development processes. It not only controlled by the input of nutrients, but also by its own characteristics of the lake. Tien Lake, a shallow lake, its eutrophication process was the same to the shallow lakes in Yangtze River Valley. Erhai Lake, a medium-depth lake, the change in water levels had a direct impact on the survival of submersed aquatic plants. The degradation and disappearance of submerged plants was positively correlated to the eutrophication of the lake. Fuxian Lake, a deep lake, its large aquatic plants were badly affected by the extent of eutrophication. The greater was the growth of algae, the greater was the decline in water quality. The eutrophication of the three lakes occurred over different time periods. 70s was the key nutrient level age of Tien Lake, and the late 80s was a critical period. Late 80s was the key to enter the nutrition transition age of Erhai Lake, and late 90s entered to the acceleration phase of eutrophication. The water quality in Fuxian Lake decreased quickly in the late 90s.