耕地自然质量空间分布及其影响因子分析——以北京市大兴区为例

定量分析耕地质量的空间分布特征,是制定与实施耕地保护措施的重要依据。本文以耕地质量等级补充完善成果为基础,以自然等指数为空间变量,采用空间自相关分析方法对北京市大兴区耕地自然质量的空间分布特征进行了研究,并采用变异系数、二元相关分析和偏相关分析方法对其影响机制进行分析,揭示了耕地自然质量空间差异的主导影响因子。研究结果表明:大兴区耕地自然质量在200~900m尺度范围内呈显著的空间正相关性,正相关HH型高等地明显聚集分布,LL型低等地面积较大且聚集性较低,负相关类型(HL和LH型)耕地无明显集中区域,零星分布。土壤有机质、表土质地和土壤剖面构型是影响耕地自然质量空间分布格局的主导因子,但影响程度有所差异。

Spatial Distribution and Influential Factors of Arable Land Quality:A Case Study in Daxing district of Beijing

Understanding the spatial distribution characteristics and influence mechanism of arable land quality is significant to make the scientific decision for the protection of arable land.In this paper,we explored the spatial structural characteristics and agglomerate regulation of arable land quality by taking the arable land quality index as the spatial variable,analyzed the reasons of the differences in the studied area with the use of variation coefficient,bivariate correlate analysis and partial correlation methods.The main results of the study were as follows:Firstly,the arable land quality exhibited a significant spatial autocorrelation to some extent of spatial distribution in Daxing district.Besides,the High-High type of arable land quality which is the positive spatial autocorrelation emerged as the cluster and had a powerful agglomeration,while the Low-Low type arable land had a wide distribution and was of low spatial autocorrelation.The negative spatial autocorrelation which included the High-Low type and Low-High type barely had a concentrate region,and most of them distributed dispersedly with barely outstanding regular pattern.Soil organic matter,surface soil and soil texture profile configuration are the dominant influential factors that affect the spatial distribution pattern of arable land quality,but the influence degree of the factors are different.