Cultivated Land Quality Analysis of Karst Mountain Areas Based on GIS: A Case Study of Jingxi County

Agricultural land quality assessment of karst mountain areas is an important means to protect and manage cultivated land quality of karst mountain areas. With Jingxi County as a case, the data resources included achievements of cultivated land grade, achievements of second land investigation, investigation of local conditions and the other data resources. With the overlay tool of MapGIS, the attribute data of evaluation index were obtained, which can reflect agricultural land's characteristics, and agricultural land quality scores were calculated and land quality was graded using the model of comprehensive evaluation of multiple factors to make further analysis on characteristics and spatial distribution. The results showed that used agricultural land is dominated by middle and high-grade lands in Jingxi County mainly, representing 68.58% of Jingxi County's agricultural lands. On the other hand, the quality of paddy land is generally higher than that of dry land, and quality of agricultural land showed higher in middle and eastern Jingxi, and lower in northwestern region, which provides references for national land management.