Studies and Demonstration Engineering on Ecological Restoration Technique in the Littoral Zone of Lake Dianchi:the Target and Feasibility

Abstract

As part of the series studies on ecological restoration technique in the littoral zone of Lake Dianchi,this paper investiga- ted the primary wetland environment and vegetation in the northeastern bank littoral zone of Lake Dianchi,the present environmen- tal bases,the target and feasibility for ecological restoration,the key limiting environmental factors and their controllability.It re- suited that,there were four inflow rivers in the research area which took large amount of soil into the lake and formed 4kin~2 wetland in the littoral zone.The reed-vegetated wetland worked as an ecological barrier to keep the lake from pollution.When the concrete dike was built up,the wetland was made into paddy field and fish pond.In front of the dike the aquatic plants and animals,and even the soil were washed out by strong wind waves.Only sand from the nearby rivers was moved here and formed a sand beach, witch was growing up at the rate of 20mm/a.For the effect of both wind waves and water pollution,no any plant growing on the sand beach.It's possible,feasible and reasonable to establish new wetland vegetation on the sand beach in front of the dike.The key limiting factors,both wind waves and water pollution were controllable.It was confirmed that the new wetland vegetation could be established,stabilized and will work for pollution control.