基于改进局部空间自相关分析的萝北县耕地保护分区

本文通过结合耕地面积与距离修正反距离空间权重矩阵,首次构建改进的局部空间自相关分析方法,并运用空间计量模型的信息准则验证其合理性和可行性;以耕地质量指数为空间变量,运用改进的局部空间自相关分析法,分析黑龙江省萝北县不同类型耕地质量的空间聚集特征及空间关联结果,并据此提出详细的耕地保护分区方案。研究结果表明：①验证了改进的空间自相关分析方法的合理性和准确性;②不同类型耕地质量在空间分布上呈现相似的集聚性规律。正相关类型（HH型和LL型）多以带状或片区形式出现,聚集性较强;负相关类型（HL和LH型）无明显集中区域,面积较小,且零星分布;③将耕地保护划分为核心保护区、重点改良区、适度保护区和综合改良区4个一级类和11个二级类,并分别从耕地自然条件、利用水平和产出效益角度提出了相应的耕地保护措施。

Zoning of protected cultivated land based on improved local indicators of spatial association

This paper presents an improved model of local indicators of spatial association established using an inverse distance weighting matrix amended by cultivated land area and distance. Taking Luobei county, Heilongjiang as an example,we conducted a study on protection zoning of arable land. Our improved model was used to explore the spatial structural characteristics and agglomerate regulation of cultivated land quality by taking the cultivated land quality index as the spatial variable. Spatial association results of different types of cultivated land quality index were analyzed. We found that the reasonableness and accuracy of improved local indicators of spatial association methods were verified. Cultivated land quality exhibited an agglomerate regulation to some extent in terms of spatial distribution,which were similar among different types of cultivated land quality across Luobei. The positive spatial autocorrelation of cultivated land quality which contained the High-High type and Low-Low type emerged as the shape of cluster or band and had a powerful agglomeration. The negative spatial autocorrelation which included the High-Low type and Low-High type barely had a concentrate region;most were distributed dispersedly with little outstanding regular pattern. Different kinds of protection zoning schemes were put forward based on local indicators of spatial association analysis of different types of cultivated land quality indexes. Cultivated land was divided into four one-class types and eleven second-class typesthe four one-class types included core protected areas,key areas of improvement,moderately protected areas and comprehensive improvement areas,and the local indicators of spatial association analysis expanded the regionalization basis of cultivated land protection and provides new thought into the hierarchical and fine management of cultivated land.