关键词: GIS, 缓冲区分析, 定级, 耕地

Abstract: An evaluation method for the gradation of cultivated land was developed on the basis of GIS, and fuzzy mathematics, and was then used for analyzing the gradation of cultivated land in Ezhou city in order to promote rational utilization and scientific management of arable land resources and also to set up an information system for arable land and for land market of urban and rural area. Factors and weight of affecting arable land quality were decided by grey analysis and AHP. ArcGIS was also used to obtain gradation unit, with layers analysis on buffer areas of trade centers and road overlaid by layers of other factors affecting cultivated land quality. The value of factors was standardized by different value functions, and indexes of gradation were calculated by the synthetic index method. Finally, cultivated land level was divided according to analytical clustering process (ACP). With ArcGIS, an evaluation map drawn on the gradation of cultivated land in Ezhou city. It is revealed that the quality in this area ranged from medium to high, and the areas in levels 2 and 3 accounted for 71.98%, which is in accordance with the local situation. By using buffer area analysis, reliable data of evaluation factors could be obtained with improved accuracy. It is proposed that the method used in the present study may also provide reference for other studies on land gradation.

Key words: GIS, buffer area analysis, gradation evaluation, cultivated land