Impact of "returning farmland to lake" works on ecological environment of Dongting lake;

Changes of soil particle composition and chemical characteristics after "returning farmland to lake" in the Dongting Lake area

Soil enzyme activities under different restoration modes after returning farmland to lake in Dongting Lake area

Application of Landsat-5 TM to analyze the change of vegetation quantity in Jicheng in the areas of “breaking dikes or opening sluice for waterstore” in Dongting Lake;

Objective To forecast the schistosomiasis prevalence in Z hongshan village of “breaking dikes or opening sluice for waterstore” in Dongt ing Lake and to provide decision support for the government.

Research shows that such approaches to sustainable uti-lization of wetland in the Dongting Lake are effective in the aspects of population control,polder removement,wetland restoration,establishment of wetland preservation area,development of in-dustries characteristic of wetlands in disaster.

Objective To forecast the schistosomiasis endemic situation in the areas of "breaking dikes or opening sluice for water store" in Dongting Lake and provide evidences for working out the control countermeasure of schistosomiasis.

In the region of cropland returned to lake,development of ecological agriculture with capacity of flood- avoidance and waterlogging-resistance,is an important way to increase immigrant income,enhance resettlement quality and quantity.