基于GIS技术的县域耕地地力评价——以辽宁省凌海市为例

摘要

The aim of this paper is to study how to evaluate farmland productivity through the combination of GIS technology with traditional methods of evaluating soil productivity.An evaluation method based on GIS is then put forward.In allusion to the actuality of the farmland resources in Linghai County,important influencing factors such as nutrient condition,soil physical and chemical character,profile situation and land situation are analyzed thereafter.The process and the method which are used to evaluate farmland productivity based on GIS are then introduced,such as how to establish the farmland resources information database and compartmentalize the evaluation units,and how to select the evaluation factors and decide their weights.The discussion is made mainly on how to establish the farmland productivity evaluation systems and models using analytical hierarchy process （AHP）.Some problems in the evaluation are also made clear.Beneficial conclusions are finally reached.%针对凌海市的耕地资源现状,结合传统耕地地力评价方法,提出基于GIS技术的县域耕地地力评价方法。介绍耕地资源基础信息库的建立、评价单元的划分、参评因素的选择及其权重的确定。利用耕地地力评价体系及其模型,分析影响耕地地力的因素,包括养分状况、土壤理化性状、剖面性状、立地条件等。