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由于土壤特性空间变异性的研究具有广泛和重要的应用价值,本文根据田间试验资料,着重介绍和探讨了其研究方法。对田间土壤的颗粒组成(粘粒和粉粒含量)、干容重、土壤水吸力、含水量和饱和导水率等进行了测定租统计分析,按一定精度和置信水平的要求确定了取样数目。根据半方差和自相关图分析了土壤特性的空间结构——方向性和相关距离;做为示例,应用Kriging法进行了最优内插计算。根据12个入渗试验资料,对所用入渗方程的适用范围和入渗参数的空间变异性进行了初步分析。
Due to the wide and important application value of the study on the spatial variability of soil characteristics, this paper mainly introduces and discusses the research methods based on the field test data. The composition of the soil in the field (clay and silt content), dry bulk density, soil water suction, water content and saturated hydraulic conductivity were measured statistical analysis of rent, according to a certain accuracy and confidence level to determine the number of samples. According to the semi-variance and autocorrelation diagrams, the spatial structure of soil characteristics - the directivity and the related distance were analyzed. As an example, Kriging method was used to calculate the optimal interpolation. Based on the data of 12 infiltration experiments, the application scope of the infiltration equation used and the spatial variability of the infiltration parameters were analyzed preliminarily.