基于GIS的河南省县级耕地地力评价研究

为了采用综合指数法对尉氏县耕地地力进行评价。通过在GIS支持下,应用第二次土壤普查资料及成果,利用河南尉氏县土壤图、土地利用现状图叠加划分法确定评价单元7609个,采用模糊评价、特尔斐法、层次分析法等,研究选取了立地条件、耕层理化、土壤管理等3个方面7个影响因子。研究结果表明:全县90319.89hm2耕地可分为五等级,其中一级地3612.68hm2;二级地15856.61hm2;三级地31795.51hm2;四级地29261.32hm2;五级地9793.77hm2,分别占尉氏县耕地总面积的4%、17.56%、35.2%、32.4%和10.84%。通过试验研究建立耕地地力评价体系及其模型。

Research on Evaluation of Soil Fertilities of Farmland at County Level in Henan Based on GIS

On the Geographic Information System （GIS） and the second general survey soil, overlaying the current land used map with the basic farmland protection map and the soil map, forming 7609 patches, which were used as the basic management and evaluation cells. This research selected seven influencing factors from three aspects such as soil nutrient content, profile situation and land management, and the evaluation system and model of farmland fertility was built up. The grade of arable land productivity was formed according to the theory of Fuzzy Mathematics, Telphi Principle and Analytic Hierarchy Program, and the farmland fertility of the county and analysis of its spatial distribution were evaluated. The results suggested that, 90319.89 hm2 farmlands could be divided into five grades, the grade one was 3612.68 hm2, the grade two was 15856.61 hm2, the grade three was 31795.51 hm2, the grade four was 29261.32 hm2 and the grade five was 9793.77 hm2, the fertility of grade one to five account for 4%, 17.56%, 35.2%, 32.4%, 10.84%, respectively.