Abstract: An experimental plot was established at Lake Wuliangsuhai in Inner Mongolia, a typical plant eutrophic lake, where a series of ecological environment restoration experiments were carried out on a large scale. The results indicated that the implementation of the submerged plant harvesting and the garden-style ecological management of the reed was an important measure to restore the ecological environment of the plant eutrophic lake. To harvest submerged plant by mechanical means would cut down the accumulation and release of inner nutrient loads, reduce re-pollution, restrict the deposition effect of living things and meliorate the environment of water body in the lake. To control the process of reed spread by mechanization technology and open up the ventilation channel and waterway in the reed growing area may reconstruct a green natural landscape of the lake and speed up the water circulation in the lake. Reasonable adoption of the ecological restoration engineering technology in a planned way will not only lessen the burden of the lake from ecological evolution and postpone the process of marshland formation, but also exploit the aquatic plant resources and make the comprehensive utilization of the environment and wetland of the lake for sustainable development.

Key words: Surface runoff, Seasonal dynamics, Spatial distribution, Environmental conditions, Leaf area index, Changbai Mountain Natural Reserve