利用GIS空间分析技术与耕地质量评价成果对余江县基本农田划定进行研究。在Arcgis中以耕地图斑为评价单元，分为耕地自然条件和耕地质量分等定级成果两个因素，共选取了坡度、灌溉条件、排水条件、土壤类型、有机质含量、有效磷含量、速效钾含量、土壤酸碱度、土壤侵蚀度、耕地国家质量等、耕地国家经济等和耕地国家利用等共12个指标，建立一种以土地评价为基础的“按质定量”的基本农田划定方法。结果认为，选取余江县耕地评价分值大于85分的耕地，划定基本农田面积28775.32 hm2，基本农田保护率为80.06%，基于GIS和耕地质量评价成果对基本农田划定提供了科学依据。%Using delimitating of the prime farmland based on the GIS spatial analysis technology and the farmland land quality evaluation results in the YuJiang County,Jiang Xi Province. On the Arcgis platform,farmland plots were chose as the evaluation unit,two evaluation factors included the farmland natural conditions and the farmland quality classification and grading results. Twelve indicators were slope,irrigation condition,drainage condition,soil type,organic matter content, effective phosphorus,rapidly-available potassium content,soil pH,soil erosion, farmland national natural grade,farmland national economical grade and farmland national utility grade. Based on these factors and indicators ,this paper established the prime farmland delimitation model emphasis on the farmland quality. The evaluation results showed that the areas of the farmland evaluation scores which were higher than 85 were 28 775.32 hectares, these farmlands were delimitated into the prime farmland protection area and the prime farmland protection ratio was 80.06%.The GIS and the farmland quality evaluation results could provide scientific basis for the delimitating of the prime farmland.
展开▼
