基于GIS的洪江市耕地地力评价研究

Evaluation of Farmland Productivity in Hongjiang City Using GIS

依托于GIS技术,用土壤图、土地利用现状图和行政区划图叠加制作评价单元,采用特尔菲法从立地条件、理化性状、土壤管理、剖面性状4个方面选取10个因子构建评价指标体系,运用AHP和综合模糊数学方法对洪江市耕地地力进行评价。结果表明:洪江市耕地中,1至7级耕地面积占总面积比例分别为:13.7%、15.9%、13.9%、12.5%、17.9%、10.7%、15.4%,耕地地力等级的高低与土壤类型、基础设施条件密切相关,评价结果对土壤改良具有指导性意义。

Based on the geographic information system （GIS）, evaluation unit was the superposition of soil distribution map, land utilization map and administrative map. Ten affected factors from four aspects covering profile situation, land growing situation, soil physieochemical property and soil management, were selected to build up the evaluation model of farm land fertility by using Delphi method. Finally the grades of cultivated land fertility were evaluated by fuzzy discrimination method and AHP. The results of farmland productivity in HongJiang City could be divided into 7grades, and the areas of gradesl--7 accounted for 13.7%, 15.9% ,13.9% ,12.5% ,17.9% ,10.7% ,15.4% of the total amble land areas respectively. The land fertility level was in close relations to soil type and infrastructure conditions, which provided practical reference for improvement of middle-low soil.