The Primary Benefite Valuation For The Ecological Screen Of Karst Watershed

Ecological screen is to protect the important ecological security of the main content,and its resulting benefits to the regional ecological environment decisive. Ecological barrier efficiency is related to society, resources and environment system, an indicator to reflect the ecological barrier ecosystem to support social and economic development capacity in the field of ecological restoration is an important subject. And also the field of sustainable development an important issue. In practice, the field is the ecological barrier construction and the fundamental basis for countermeasures.Therefore, through the benefits of regional ecological barriers can better understand the various types of ecological barriers on the supporting role of social development, awareness of population, resources and environmental development of the relationship to better achieve the nature of socio-economic sustainable development. Ecological barrier is a new area of research, the results of the present study on the limited research theories and methods are not mature, and many aspects need further research and exploration. This paper focuses on "ecological barrier benefit evaluation"as the theme to study the ecological recovery as a starting point, benefit evaluation of ecological barrier theory, method and practice the research and discussion. The main contents and conclusions include:(1) The ecological barrier of the background and significance is described, progress in the construction of ecological environment, to define the concept of ecological barriers and functional characteristics. According to the ecological barrier of the characterization of factors and characteristics of ecological barriers, barriers to determine the ecological benefits of evaluation theory.(2) The content according to the ecological barrier requirements, benefit evaluation to determine the principles of ecological barriers, ecological barriers from the goal orientation, and economic integration, regional differentiation and dynamic changes in other aspects, establishes a fully reflect the benefit of the index system of ecological barriers. (3) Used the AHP evaluation index weights given to select the set of fuzzy comprehensive evaluation of general ecological environment Houzhaihe comprehensive ecological barrier built upstream of the effectiveness of the Pearl River.