Introduce The Principle Of Ecology Precedence Into Urban Land Evaluation

Urban land evaluation is the basis of urban land use planning which is the key content of the city master planning. The function of urban land evaluation is to evaluate the engineering, technique and economy conditions .It is the request which the foundation city develops, to be regarded as project assessing and technical and economic evaluation that natural conditions and position condition developed carried on with the ground of the urban construction. Master planning is the guiding principles of development of modern city. It synthesizes study and determines city nature, scale, capacity and development form. And guarantee procedure and science of each goal, stage and way of development of the city, guiding the city to develop rationally. So, the land used for city evaluating has important influence to build on the master planning and the development of the city in the future. Except atmosphere and water in the natural environment, the most direct and basic factor is the land to survive to the living beings. The industrial great development, population expand rapidly, the urbanization process accelerates have led to the disruption of nature in intensity. And force the natural environment to send out the warning frequently to the mankind, impel people to pay attention to the environmental question more and more. It has made people realize that the development of city could realize the goal of sustainable development only followed ecological way.Urban land evaluation aims at the possible development land of urban in the future. These areas are in the urban fringe and rural combination department mainly, or independent of the urban outside. These areas have great influence on the development of the ecosystem of outside the city and regional ecosystem of urban inside the city in the future. Meanwhile, the land used for city evaluating included some special areas. These areas have already belonged to the city, and already contained a large amount of artificial construction. But because of the transition of urban structure and developing direction, these areas may carry on the transformation in the future. The construction and development of these areas can exert an influence on development of urban ecosystem. So taking city as centre of development in future, the urban land evaluation seems particularly important to human development and natural environmental protection.Urban land evaluation is regarded as the basis of the choice city developing area, determining the developing direction of the city and urban form, influencing the development of the ecological environment and external ecological environment of the city inside the city too. At the same time urban land evaluation is the basis of urban master plan too, and it is essential to promoting the sustainable development, marching the city towards the urban goal of the ecology. For making great efforts to realize the goal that develops together in urban construction and ecological construction, it is an inevitable choice to emphasize the ecology preferential principle in urban land evaluation. Emphasized urban land evaluation of the ecology preferential principle, through analysis five aspects indexes in the possible developing area of cities, confirm different grades of different areas of the possible developing area of cities. While confirming the grade, ecology preferential principle reflect while evaluating paying attention to citing and external protection and recovery of ecological environment mainly, among them the ecological sensitiveness area must be divide into forbid construction land and protected in the ecological sensitizing range. And has formed evaluation method, procedure and evaluated the conclusion.