Study On The Ecological Suitability Assessment Of County Land Use

The county as the focus of the future urbanization development space, it is urgent need to strengthen land-use planning overall county space. Since county researches rise to global scope, the exploration for ecological suitability evaluation of land use based on the complex ecological system theory of society-economy-nature is not only an important approach to realize rational layout of urban and rural spaces and intensive utilization of land resources, but also a precondition for realizing protection and construction of urban-rural integration.Based on the complexity of land use in the entire county, upon supports from the complex system theory, landscape ecology theory, land utilization elastic theory and other related theories, this paper combines the GIS technology with the space multi-objective decision-making method and the fuzzy comprehensive evaluation method to establish a model based on ecological suitability assessment for land use in the range of county. With Jiahe County as an example, this paper also evaluates the most suitable land for urban construction and development, land for village construction and development,land for ecological forestry and land for ecological agriculture in Jiahe County from the perspectives of integration of urban and rural spaces and ecological security pattern, providing scientific bases for planning of the land layout of urban-rural integration in Jiahe County. The following main conclusions are formed through empirical researches:(1) Through ecological investigation and data collection, the GIS technology is used for processing of industrial planning drawing data, economic and social statistical data and relevant data collected on site. Moreover, various materials affecting suitability evaluation for land resources in Jiahe County are uniformly put into storage, establishing an urban and rural space management database platform based on GIS, solving relevant technical difficulties such as massive data storage, inquiry and spatial analysis correlated to ecological suitability evaluation for land use at the county level, and making remarkable improvement to work efficiency.(2)During the establishment of evaluation index system, a discussion is made on the selection of evaluation indexes. Besides, a rational solution is worked out for the dimensionless method between quantitative indexes and qualitative indexes in the evaluation system by using the GIS technology and combing the membership function transformation formula. The fuzzy vector of evaluation factors is calculated through the geometric mean of the precedence relationship judgment matrix, solving the mathematical model issue in suitability evaluation.(3) Based on the analysis on suitability evaluation results, the multifunctional utilization suitability evaluation is made for land resources at the county level by. using the multi-objective decision support method and combing the fuzzy evaluation with the GIS spatial analysis, which is capable of solving the suitability analysis on construction land, agricultural land, forestry land and various types of land use in the range of the entire county, eliminating most uncertainties, and finally providing elastic selection to strategic decisions as well as scientific basis to the planning for land layout of urban-rural integration and for construction and protection of ecological environment.