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为了揭示耕层土壤有机质含量的空间变异规律,指导土壤肥力评价和管理工作,实现耕地资源的可持续利用,本研究通过土壤样本野外采样和分析,测定样本中土壤有机质的含量,在ArcGIS地理信息系统平台上,利用地统计分析模块中的克立格法分析文登市耕层土壤有机质的空间变异性,并对比选择最优的克立格插值模型。结果表明:文登市耕层土壤有机质拟合的最优理论模型是Tetraspherical模型;C0/sill值为0.86,耕层土壤有机质空间相关性很弱,耕作制度、施肥数量和种类、种植制度等人类活动的作用影响很大,这些人为活动使土壤有机质的空间相关性减弱,逐渐向均一化方向发展;耕层有机质含量处在较低水平,应改善耕作管理方式实现耕地资源的可持续利用。
In order to reveal the spatial variability of soil organic matter content in topsoil, to guide the evaluation and management of soil fertility, and to realize the sustainable use of cultivated land resources, this study determined the content of soil organic matter in the sample through field sampling and analysis. On the system platform, the Kriging method in geostatistics analysis module was used to analyze the spatial heterogeneity of soil organic matter in the topsoil of Wendeng City, and the optimal Kriging interpolation model was selected and compared. The results showed that the optimal theoretical model for tillage soil organic matter fitting in Wendeng City was Tetraspherical model. The C0 / sill value was 0.86. The spatial correlation of soil organic matter in tillage soil was very weak. The human activities such as tillage system, quantity and type of fertilization, planting system The anthropogenic activities make the spatial correlation of soil organic matter weakened and gradually develop towards homogenization. The content of organic matter in tillage layer is at a low level, and the tillage management should be improved to realize the sustainable utilization of cultivated land resources.