武汉东湖受控生态系统中水生植被恢复结构优化及水质动态

THE AQUATIC VEGETATION RESTORATION AND ITS STRUCTURE IMPROVEMENT AND WATER QUALITY DYNAMICS IN THE CONTROLLED ECOSYSTEM IN EAST LAKE (WUHAN)

于1993－1995年对武汉东湖的布围和网围受控生态系统中的植被恢复、结构优化及水质进行了初步研究，结果表明：在受控生态系统中，水生维管束植物生物量明显增加，控制养殖规模是恢复水生植被的前提，自然恢复的水生植被，结构较简单，通过选种优良植物，可优化植被结构，加速植被恢复进程；恢复水生植被时．应以沉水植物为主体；生长良好的水生维管束植物能使水中N、P浓度明显降低，浮游植物生物量减小；莲、芦苇、苦草、狐尾藻和金鱼藻适应性较强，可作为重建水生植被的物种．

In order to restore damaged lake aquatic vegetation, a research was carried out on the aquatic vegetation restoration and its structure improvement and water quality in the controlled ecosystems which were made of waterproof cloth and nylon net in East Lake (Wuhan). The results show that in the controlled ecosystems. the biomass of aquiatic vnscular plants increased obviously. the floating plants settled down easily.To limit fish Culture was the primary way to restore aquatic vegetatlon. The aquatic vegetation restored naturally was simple in structure. By choosing fine plant species and having them planted scientifically. the aquatic vegetation can be restored faster, and its structure improved.Submerged plants would be the main aquatic species in restoration vegetation. The well grown aquatic vascular plants can decrease N. P concentrations in water body and phytoplankton biomass. The Nelumbo nucifera,Phragmites communis, Vallisneria spiralis.Myriphyllum spicatum and Ceratophyllum demersum are qualified for adaptability.and can be selected as the species to rebuild the aquatic vegetation in East Lake (Wuhan).