Quantifying the soil pore structure is critical for understanding plant growth and water/solute movements in the soil. However, most previous studies quantified the soil pore structure in a shallow layer by using low resolution medical computed tomography (CT), whereas few have quantified the soil pore structure in deep soil layers with high resolution CT. In this study, we quantified the soil pore structure of wind-deposited loess under different vegetation types (wheat, weeds, apple orchard, and Robinia pseudoacacia) at depths from 0 to 4.5 m by industrial CT. The results showed that the soil pore number and porosity tended to decreased with depth, but there were no significance differences below 2 m among all vegetation types. For different depths and vegetation types, the number of pores measuring 0–100 μm was highest, followed by those measuring.

100–500 μm, and lowest for those measuring > 1000 μm. The contribution of pores measuring 100–500 μm to the total pore volume was highest. The variations in the connectivity and surface area density were also focused mainly within the depth down to 2 m, and the variations were minor below 2 m. There were no significant differences in the bulk density and soil pore characteristics under different vegetation types, except for weeds. The results obtained in this study provide insights into the interactions between vegetation and soil water, as well as the hydrological processes for the wind-deposited loess.

定量土壤孔隙结构对于理解植物生长和土壤中水/溶质的运动至关重要。但是，大多数以前的研究通过使用低分辨率医学计算机断层扫描（CT）来量化浅层土壤孔隙结构，而很少有人使用高分辨率CT来量化深层土壤孔隙结构。在这项研究中，我们量化了不同植被类型（小麦，杂草，苹果园和刺槐）的风生黄土的土壤孔隙结构。），通过工业CT在0至4.5 m的深度处进行。结果表明，随着深度的增加，土壤孔隙数和孔隙率均呈下降趋势，但在2 m以下，所有植被类型之间均无显着性差异。对于不同的深度和植被类型，测得的孔隙数量最多为0–100μm，其次是测得的数量。

100-500μm，对于> 1000μm的样品最低。尺寸为100–500μm的孔对总孔体积的贡献最大。连接性和表面积密度的变化也主要集中在2 m以下的深度内，而在2 m以下的变化很小。除杂草外，不同植被类型下的容重和土壤孔隙特征没有显着差异。这项研究获得的结果为深入了解植被与土壤水之间的相互作用以及风积黄土的水文过程提供了见识。