基于ArcGIS的商洛市耕地植烟适宜性评价

Evaluation on Farmland Suitability for Planting Tobacco in Shangluo Based on ArcGIS

针对陕西省商洛市的6个主要烟草产区,以其土壤图、土地利用现状图和行政区划图叠加分析形成的图斑为评价单元,选取立地条件、土壤性质、土壤养分及p H值、土壤管理4个方面共13个指标构建了商洛市耕地植烟适宜性评价指标体系,采用层次分析法和模糊数学原理开展耕地植烟适宜性的定量评价和分级,以期为优化烟草布局和种植区域划分提供理论参考。结果表明,高度适宜烟草种植区占植烟耕地面积的32.61%,主要分布在石门基地单元南部、灵口基地单元中西部、永丰基地单元西部及中东部等地区;适宜烟草种植区是研究区的主体,占55.00%,云镇基地单元分布最多、所占比例最大,米粮基地单元的中部、北部及永丰基地单元东部分布范围也较大;勉强适宜烟草种植区占11.09%,主要分布在景村镇中部和南部、石门镇北部和中部、腰市镇中部等地区;不适宜烟草种植区仅占1.30%,主要分布在景村镇北部和腰市镇北部。

Six main tobacco planting regions of Shangluo in Shannxi were taken as the research objects.The Shangluo soil map,present landuse map and administrative division map were overlayed to confirm the evaluation unit. The evaluation index system of farmland suitability for planting tobacco in Shangluo was established with 13 evaluation indexes from four respects of topographic,soil properties,soil nutrients and p H value,soil management. The AHP( analytic hierarchy process) method and fuzzy mathematics theory were taken to evaluate and grade the farmland suitability for planting tobacco. This study could provide theoretical reference of optimizing the layout and planting area division of tobacco. The results showed that the high suitability grade farmland accounted for 32. 61%,which mainly distributed in the south of Shimen base unit,the mid west of Lingkou base unit,the west and Mideast of Yongfeng base unit. The sui-table area was the subject of study area with the proportion of 55. 00%,which mainly distributed in Yun town base unit,followed by the middle and north of Miliang base unit. The barely suitable area accounted for 11. 09%,which mainly distributed in the middle and south of Jingcun town,the north and middle of Shimen town,and the middle of Yaoshi town. The unsuitable area just accounted for1. 30%,which distributed in northern Jingcun town and northern Yaoshi town.