城市土地的生态适宜性评价方法——以江西萍乡市为例

Study on methodology of ecological suitability assessment of urban landuse:An example of Pingxiang

基于ArcGIS 8.3空间数据分析和可视化功能,提出了一种实用的城市土地生态适宜性评价方法,并以江西省萍乡市总体规划区土地生态适宜性评价为例,探讨了此方法的实际应用。该方法首先选择城市的主要土地利用类型,然后建立土地生态适宜性评价因子体系,并对各种用地类型进行单因子生态适宜度评价,再通过层次分析法确定评价因子权重,并运用GIS技术将单因子适宜度图层加权叠加,最后生成综合的城市用地生态适宜度分布图,从而从空间上相对准确地表征了不同类型土地的生态适宜度。

Landuse ecological suitability assessment is very important in urban ecological planning. It is essential for this integrative approach that environmental aspects are incorporated into the planning process at an early stage, instead of being evaluated afterwards. This paper describes a methodology that incorporates ecological and environmental aspects in urban planning processes. Based on the functions of spatial data analysis and digital picture visualization of ArcGIS 8.3, a practical method of ecological suitability assessment of urban landuse was supplied. Pingxiang in Jiangxi province was taken as an example and applied to assess the ecological suitability of its urban landuse. With this method, the main urban landuse types were selected firstly and then factors of ecological suitability assessment were chosen. Furthermore, single factor assessment on all urban landuse types was carried out. And then weights of all factors were determined by hierarchical analysis. Through overlaying of all single factor assessment layers, map of ecological suitability assessment of urban landuse could be generated. This easy-use assessment method aims to support the work of local authorities and urban planning offices, especially with regard to identifying options in the early phases of the landuse planning process.