基于GIS的庄浪县耕地地力等级评价

Quantitative Evaluation of Cultivated Land Fertility Based on GIS in Zhuanglang County

在GIS支持下,利用行政区划图、土壤图和土地利用现状图叠置的方法确定评价单元,选取土壤理化性状、剖面性状以及立地条件等11个因子,建立耕地地力评价体系及其模型,运用层次分析法和模糊数学、综合指数等方法将庄浪县71 079.3 hm2耕地分为5级,并对耕地地力进行综合评价,评价结果符合当地实际。

Based on the techiques of GIS,overlay analysis was used to determine evaluation unit by the administrative map,soil map and land use type map,selected eleven influential factors from three aspects,of soil physical and chemical properties,profile characters and site conditions,established the evaluation system and model of farmland productivity,The methods of Analytical Hierarch program（AHP）,Fuzzy Mathematics Theory（FMT） and Integrated Index were adopted to synthetically evaluate the farmland productivity.The results showed that the basic cultivated farmland of 71 079.3 hm2 in the whole county was divided into 5 grades,and this paper conducted comprehensive evaluation of the cultivated land fertility.The results were well in line with the local situation and the approach was feasible and effective in cultivated land fertility assessment.