Evaluation of Cultivated Land Fertility Based on GIS at County Level

To establish a combined method of qualitative and quantitative for evaluating cultivated land fertility, visually and accurately reflect cultivated land fertility, and provide the basis for scientific management and sustainable utilization of cultivated land resources, we analyzed the cultivated land fertility in Yongning County of Ningxia Hui Autonomous Region. Based on GIS, we adopted Delphi approach, cluster analysis, analytic hierarchy process (AHP) and fuzzy evaluation. Results show that the fertility of cultivated land could be divided into 6 grades and the area of the first, second, third, fourth, fifth and sixth grades was 70 585.91 hm2, 219 047.67 hm2, 230 101.46 hm2, 132 079.65 hm2, 39 328.14 hm2 and 35 502.53 hm2 respectively, accounting for 9.71%, 30.15%, 31.67%, 18.18%, 5.41% and 4.89% separately. In line with major existing problems in utilization of cultivated land, we proposed some suggestions for rationally utilizing and improving cultivated land resources.