基于GIS的喀斯特地区耕地质量评价——以贵州省绥阳县为例

GIS-Based Arable Land Quality Evaluation in Karst District——A Case Study in Suiyang County of Guizhou Province

喀斯特地区耕地质量评价是喀斯特地区耕地质量保护和管理的重要手段。利用MapGIS采用多图层叠加确定评价单元并获取单元属性数据,选取土壤条件、环境条件和气候条件3组评价因子,建立耕地质量评价体系,运用层次分析法对绥阳县耕地质量进行综合评价。结果表明:绥阳县耕地质量中等,Ⅵ级至ⅩⅢ级地分别占8.43%,10.03%,9.88%,0.66%,15.85%,16.73%,16.07%和6.05%。该县中南部以中高等地为主;北部、西部、东部以低中等地为主。经实地检验评价结果基本与实际情况相符。

Arable land evaluation is the important foundation and critical condition for regional agricultural land sustainable development of social-economy in Karst region.With the aid of MapGIS,the multi-map superimposition method was used to define evaluation units and to extract unit attribute data,select factors from three aspects,i.e.,soil conditions,environmental conditions,climatic conditions,and establish the evaluation system.The quality of regional cultivated land was evaluated by using analytic hierarchy.The results indicate that the arable land in this area is medium in quality and can be sorted into 8 levels,accounting for 8.43%,10.03%,9.88%,0.66%,15.85%,16.73%,16.07% and 6.05%.The middle and high quality arable lands distribute in the central and southern Suiyang County,lower-middle quality arable lands lie in the northern,western and eastern of Suiyang County.The results is roughly in accordance with the actual situation.