The soil structure near the surface of agricultural soils changes with season mainly by land management together with climatic and biological factors. Quantitative analysis of post-tillage changes in soil structure and related hydraulic properties are necessary for evaluating and improving models of soil hydrological and transport processes. The objectives of this study were to quantify changes in soil seedbed structure induced by rainfall and drainage and to estimate the eff ;ects of soil texture and SOC on these changes. We collected samples from the harrowed layer of twenty-six fine to coarse textured Swedish mineral soils. Air-dried soil was placed in cylinders (5 cm high, diameter 5 cm) and exposed to simulated rainfall (5 mm h⁻¹ for 4 h) and drainage (−50 cm pressure potential) cycles in the laboratory. We used X-ray tomography to quantify changes in pore networks in a thin surface layer and in the whole cylinder. Infiltration rates at -5 cm pressure potential were measured using a mini disc tension infiltrometer on replicate air-dried samples and on the samples included in the consolidation experiments at the final state. Total imaged specific pore volumes generally decreased from initial to final state and pore size distributions were shifted towards larger proportions of below image resolution pores (< 80 μm). There was a strong positive correlation between clay content and changes (i.e. final state-initial state) in the specific volume of pores <80 μm. Soils with high clay content and soil organic carbon (SOC) content often have strong aggregates that resist changes. Nevertheless, both clay and SOC contents were negatively correlated with the changes in specific imaged pore volume. These results highlight the importance of swelling, which is largely controlled by clay content, for seedbed consolidation. In line with previous studies, when excluding coarse textured soil, the changes in surface porosity were negatively correlated with silt content. Changes in infiltration capacity were not significantly correlated with any basic soil properties. Our results suggest that shrinking-swelling should be a central part in any model for seedbed consolidation.

农业土壤表层附近的土壤结构随季节而变化，这主要是由土地管理以及气候和生物因素引起的。耕作后土壤结构变化和相关水力特性的定量分析对于评估和改善土壤水文和运输过程模型是必要的。这项研究的目的是量化降雨和排水引起的土壤苗床结构变化，并估算土壤质地和SOC对这些变化的影响。我们收集了从26耙层到粗糙的瑞典质地的矿物土壤的样品。将风干的土壤放入圆筒（高5 cm，直径5 cm）中，并暴露于模拟降雨（5 mm h ^-1在实验室中进行4 h）和排水（−50 cm潜在压力）循环。我们使用X射线断层扫描来量化薄表层和整个圆柱体中孔网络的变化。使用微型圆盘张力浸渗仪在重复的风干样品上以及在最终状态下包括在固结实验中的样品上，在-5 cm压力下测量渗透率。总的成像比孔容通常从初始状态减小到最终状态，并且孔径分布朝低于图像分辨率的孔（<80μm）的较大比例偏移。在<80μm的比容中，粘土含量与变化（即最终状态-初始状态）之间存在很强的正相关。具有高粘土含量和土壤有机碳（SOC）含量的土壤通常具有能抵抗变化的强聚集体。然而，粘土和SOC含量均与特定成像孔体积的变化呈负相关。这些结果突出了在很大程度上取决于粘土含量的膨胀对于苗床固结的重要性。与以前的研究一致，当排除粗糙的粗糙土壤时，表面孔隙度的变化与淤泥含量呈负相关。入渗能力的变化与任何基本土壤特性均无显着相关。我们的结果表明，收缩-膨胀应该是任何苗床固结模型的核心部分。这些结果突出了在很大程度上取决于粘土含量的膨胀对于苗床固结的重要性。与以前的研究一致，当排除粗糙的粗糙土壤时，表面孔隙度的变化与淤泥含量呈负相关。入渗能力的变化与任何基本土壤特性均无显着相关。我们的结果表明，收缩-膨胀应该是任何苗床固结模型的核心部分。这些结果突出了在很大程度上取决于粘土含量的膨胀对于苗床固结的重要性。与以前的研究一致，当排除粗糙的粗糙土壤时，表面孔隙度的变化与淤泥含量呈负相关。入渗能力的变化与任何基本土壤特性均无显着相关。我们的结果表明，收缩-膨胀应该是任何苗床固结模型的核心部分。