Abstract:

On the geographic information system (GIS) and the second general survey soil, overlaying the current land use map with the basic farmland protection map and the soil map, forming 7609 patches, which are 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.