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以宁夏境内压砂地为研究对象,研究了不同土层压砂地土壤全盐量和pH值的空间变异性。结果表明:描述性统计分析,在垂直方向上,pH值随土壤深度的增加而下降,每层土样pH值的变异系数变化均<10%,属弱变异性;全盐量随着土样深度的增加而增加,变异系数均>100%,属强空间变异性。各层pH值理论分布模型均为高斯模型,且具有中等程度的空间相关性,反映出压砂地土壤pH值的空间变异是随机性因素和结构性因素共同作用的结果;0~20、20~40cm全盐理论分布模型为高斯模型,40~60cm属球状模型,具有强烈的空间相关性,说明其变异主要是由结构性因素引起。Kriging插值分析表明研究区土壤全盐量和pH值在水平空间分布总体呈环状,pH值由西北向东南方向逐渐降低,全盐量由西北向东南方向递增。
Taking sand as a research object in Ningxia, the spatial variability of soil salinity and pH value in different sand layers was studied. The results showed that in descriptive statistical analysis, in the vertical direction, the pH value decreased with the increase of soil depth, and the coefficient of variation of soil pH value in each layer varied less than 10%, which belonged to weak variability. Depth increases and increases, the coefficient of variation are> 100%, is a strong spatial variability. The theoretical models of pH distribution in each layer are Gaussian model with moderate degree of spatial correlation, reflecting that the spatial variability of soil pH value in the sand is the result of both random and structural factors. The distribution model of 40 cm full salt theory is a Gaussian model and the spherical model of 40-60 cm has a strong spatial correlation, indicating that its variation is mainly caused by structural factors. Kriging interpolation analysis showed that the spatial distribution of soil total salinity and pH values in the study area was generally ring-shaped, the pH values gradually decreased from northwest to southeast, and the total salinity increased from northwest to southeast.