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本文根据冲积平原区（华北平原）上一个15平方公里区域内格网化布点的大量土壤剖面质地层次的观测数据，采用地统计学方法研究了区域粘土层一些指标值的空间变异结构，通过概率统计研究了区域内几种质地类型层次厚度的概率分布特征。研究结果表明，第一粘土层厚度、第一粘土层出现深度、1米内粘土层总厚度和2米内粘土层总厚度的最大相关距离均在1500米—2000米之间，各种类型质地层次厚度的概率分布均具有对数正态分布的特点。
In this paper, based on the observational data of a large number of soil profiles in a 15 km2 area in the alluvial plain (North China Plain), the spatial variability of some index values in the clay layer was studied by using geostatistics. The probability distributions of the thickness of several texture types in the area are statistically studied. The results show that the maximum correlation distance between the thickness of the first clay layer, the appearance of the first clay layer, the total thickness of the clay layer within 1 meter and the total thickness of the clay layer within 2 meters are both between 1500 and 2000 meters. The thickness of various types of texture The probability distributions all have lognormal distribution.