基于GIS的永安市农业用地适宜性评价

Suitability Assessment of Agricultural Land in Yong’an City Based on GIS

以永安市农业用地适宜性为研究对象,根据当地情况,从植物基本生长需求出发结合安全因素,选取地形地貌、坡度、有机质含量、营养元素N/P/K丰缺、土壤环境质量以及特殊元素硒分布情况这6个评价因子作为农业用地适宜性评价的指标体系,利用GIS技术进行空间叠加分析。结果表明,区内大部分土地满足基本农业种植需求,农业用地适宜区集中在研究区中部,面积为77.0km^2,较适宜区面积为816.4km^2,较不适宜区面积为28.3km^2,可在区内有针对性地开展多种类经济作物土壤需求调查,开发地方特色农产品产业;对于低效耕地及陡坡耕地宜退耕还林还草以保持水土;在下一步的开发建设中可根据实际需求,在适宜和较适宜土地中增减农用地面积,以维持农业经济稳定发展。

Taking the suitability of agricultural land in Yong’an City as the research object,according to local conditions,based on the basic plant growth needs and safety factors,six evaluation factors such as topography,slope,organic matter content,nutrient element NPK abundance,soil environmental quality and selenium distribution of special elements were selected as the indicator system for evaluating the suitability of agricultural land,and GIS technology was used for spatial analysis.The results showed that most of the land in the area met the needs of basic agricultural planting.The suitable area for agricultural land was concentrated in the central area of the study area of 77 km^2,the suitable area was 816.4 km^2,and the unsuitable area was 28.3 km^2.The soil demand survey of multiple cash crops can be carried out in this area and then develop industries featuring local agricultural products.Unsuitable farmland should be converted to forests.In the next stage of development and construction,the area of agricultural land can be increased or decreased according to the actual demand,so as to maintain the steady development of agricultural economy.