Study On The Impact Assessment Of Dahuofang Reservoir On The River Ecosystem Service Function

The reservoir has been an effective tool which is widely used around the world, by flood storage, providing water and accessing energy for human being. With the advancement of technology and the level of human understanding, the people don't only focus on the economic benefits of the reservoir and dam construction ,but also gradually find that a series of eco-environmental problems. Western developed countries dispute between the pros and cons of down and on the dams, which have also aroused extensive attention in China. However, according to China's national condition, the reservoir construction projects will continue to carry on, in order to reduce the ecological hazards of the reservoirs, including the ones have been built, the ones are building, and the ones are planning to build, to achieve sustainable development, which should fully take into account the negative effects of the reservoir projects and the value of environmental resources, so it is very significant to carry out impact assessments and to find ecological compensation measure researches for the reservoirs which have been built on.The paper takes Dahuofang Reservoirs in Fushun as the study area, combining the river ecosystem service functions with the impacts of reservoir construction on the river ecosystem, studies the impacts of Dahuofang Reservoir on the river ecosystem service functions. The major contents and research results are as follows:(1)In accordance with the affective characteristics of Dahuofang Reservoir work on the river ecosystem service functions and the collections of the basis of data, takes 2007 as the evaluation-base year, establishes the evaluation system, and assesses the impacts of Dahuofang Reservoir on the river ecosystem service functions, including six positive impacts and three negative impacts. The results show that providing water and flood storage are the main functions of Dahuofang Reservoir, whose respective functional value of the year is 460.697×10~6 yuan and 300.000×10~6 yuan, and hydropower, reservoir farms, reducing harmful gas emissions and tourism of the reservoir area are also important functions of Dahuofang Reservoir. The total of the six positive impacts'functional value of the year is796.551×10~6 yuan. Sedimentation accumulation is a major negative impact of Dahuofang Reservoir, whose loss value of the year is 198.661×10~6 yuan. Reservoir inundation is also negative impact that can not be ignored, and the total of the three negative impacts'function value of the year is 286.911×10~6 yuan.(2)Applies the thoughtway of ecological footprint, to calculate supply and requirement of ecological footprint of Dahuofang Reservoir, and the results show that providing water and flood storage are the main functions of Dahuofang Reservoir, whose respective ecological supply footprint are 80.4037×10~4 hm~2and 75.9173×10~4 hm~2, and sedimentation accumulation is a major negative impact of Dahuofang Reservoir whose requirement of ecological footprint is 143316.432 hm~2. The total of the four ecological supply footprint is 1575620.92 hm~2, and the total of the three requirement of ecological footprint 166264.652 hm~2. (3) Put forward the ecological compensation measures of Dahuofang Reservoir , and conclude an operation flow chart of ecological compensation and an compensation network chart of Dahuofang Reservoir on the river ecosystem affected, all of which can provide references for ecological compensation studies of the rivers.