县·乡镇两级尺度下耕地质量空间自相关分析——以湖北省广水市为例

目的]从县级、乡镇级两级空间尺度上运用空间自相关分析(Moran’s I)方法定量研究广水市耕地质量的空间集聚性规律特征。方法]基于空间自相关Moran’s I分析方法,以湖北省广水市为研究区,将耕地质量国家自然等指数、利用等指数和经济等指数作为空间变量,以耕地图斑作为空间单元进行空间自相关分析,从县级和乡镇级两级尺度上分析耕地质量空间差异性特征并进行两级对比分析。结果]广水市耕地质量在空间分布上呈现出一定的集聚性规律,"中北部"的耕地质量较高,"西北角"耕地质量相对较低,其他地方耕地质量处于中等水平且分布较集中。广水市耕地质量在县级和乡镇级尺度上呈现出较强的空间自相关,说明在空间格局上呈现出很强的集聚态势。县、乡镇两级尺度上,耕地质量指数Moran’s I值均呈现出国家经济等指数国家利用等指数国家自然等指数的递减特征,三者均呈现显著的空间正相关集聚态势。结论]耕地质量空间差异在不同尺度上有一定的敏感性和内部差异性特征,耕地质量空间差异特征研究可为土地整治、高标准基本农田划定等工作提供参考。

Spatial Autocorrelation Analysis of Arable Land Quality at County and Township Scale—A Case Study of Guangshui City,Hubei Prov-ince

Objective] The aim was to study the characteristics of spatial agglomeration law of arable land quality of Guangshui City at county and township scale based on the spatial autocorrelation of Moran's I analysis method.Method] Taking Guangshui City of Hubei Province as the study area,the national natural land quality index,the land use index and economic index as spatial variables,and farming spot as a space unit map spatial autocorrelation analysis,the characteristics of the spatial differences of arable land quality from the county and township scale were analyzed based on the spatial autocorrelation of Moran's I analysis method.Result] Spatial distribution of the quality of arable land in Guang-shui City presented a certain clustering rules,quality of arable land in'North central' was high,'Northwest corner' was relatively low,the rest were in the middle level and relatively concentrated.The quality of arable land in Guangshui showed a strong spatial autocorrelation at the county and township level,indicating that the spatial pattern showed a strong agglomeration situation.Moran's I value of arable land quality index showed the national economic index,national utilization index,national natural index decline characteristics both at the county and township scale,and all the index showed a significant positive correlation of the spatial agglomeration.Conclusion] The spatial difference of land quality at different scales has certain characteristics of sensitivity and internal differences,and differences of arable land quality feature space can provide an impor-tant reference for land consolidation,high standards of basic farmland.