浮床陆生植物对富营养湖泊水生态系统的修复作用、机理

In retrospective view of the concepts of ecological rehabilitation of eutrophic lakes at home and abroad it comparatively emphasizes the functions of engineering and physical ecological measures. litation in situ i.e. rehabilitating aquatic ystem by planting aquatic macrophytes is one of measures more likely adopted in recent years. However, the actual effects of above-mentioned measure are not satisfied. In fact there is none of lakes to have achieved the full rehabilitation of water quality or aquatic ecosystem so far. From the experience of developed countries, the final rehabilitation of aquatic ecosystem of eutrophic lakes needs several decades of time, consuming large amount of money. .The technical concept of this project is to adopt surface aquaponics technology, which has China-owned knowledge property to reduce the pollutant load from endogenous source on the premise of halting pollutants from exogenous source, and in turn to control blue-green algal blooms, to rehabilitate aquatic ecosystem, and finally to reach the goal of the full rehabilitation of aquatic ecosystem, especially on natural restoration and multiplication of submerged aquatic macrophytes by planting and cultivation.The main contents and aims of this research project are to determine the key water chemical-physical parameters and mechanisms, the functions and principal factors of restoring aquatic bio-diversities in eutrophic lakes by terrestrial plants on floating-beds. The research was performed as planned, but there is a big gap between the longer duration needed in research and the short term defined by the project so that the results are only one-phase achievements. Studies show that under the premise of planting coverage of 15%-60% the removal rates of N and P from water body by plants reached 86-90mg/L and 32-34mg/L respectively; the concentration of TN and TP obviously decreased with the removal rates 51.2-63.5% and 54.4-74.1% respectively; the transparency increased from less than 5 cm to 110 cm and further increased as the planting coverage expanded even to reach 158 cm in 60% planting coverage. All of these conditions formed the foundation of the final rehabilitation of aquatic ecosystem of less eutrophic water bodies. .

研究在利用浮床陆生植物治理修复富营养湖泊水生态系统过程中的作用及机理。包括抑制蓝藻恶性繁衍的主导因素及机理、对恢复水生生物的作用及主导因素、对供试水域水文要素的影响及其原理，和主要水生植物自然恢复所需的关键性水文和理化条件参数及机理。目的是为建立利用浮床陆生植物治理修复富营养湖泊水生态系统技术模式提供科学依据和相关参数。