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Characterization by X-ray μCT of the air-filled porosity of an agricultural soil at different matric potentials
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2023-06-01 , DOI: 10.1111/ejss.13387
Sarah Smet, Erwan Plougonven, Angélique Léonard, Aurore Degré

To describe various important soil processes like the release of greenhouse gases or the proliferation of microorganisms, it is necessary to assess quantitatively how the geometry and in particular the connectivity of the air-filled pore space of a soil evolves as it is progressively dried. The availability of X-ray computed microtomography (μCT) images of soil samples now allows this information to be obtained directly, without having to rely on the interpretation of macroscopic measurements using capillary theory, as used to be the case. In this general context, we present different methods to describe quantitatively the configuration of the air-filled pore space in 3D μCT images of 20 separate samples of a loamy soil equilibrated at different matric potentials. Even though measures using μCT on such multi-scale materials strongly depend on image resolution, our results show that in general, soil samples most often behave as expected, for example, connectivity increases with higher negative matric potential, while tortuosity decreases. However, simple correlations could not be found between the evolution of quantitative descriptors of the pore space at the different matric potentials and routinely measured macroscopic soil parameters. A statistical analysis of all soil samples concurrently confirmed this lack of correspondence.

中文翻译:

不同基质势下农业土壤充气孔隙率的 X 射线 μCT 表征

为了描述各种重要的土壤过程,如温室气体的释放或微生物的增殖,有必要定量评估土壤的几何形状,特别是空气填充孔隙空间的连通性如何随着土壤逐渐干燥而演变。土壤样品的 X 射线计算机显微断层扫描 (μCT) 图像的可用性现在允许直接获得这些信息,而不必像过去那样依赖使用毛细管理论对宏观测量的解释。在这种一般情况下,我们提出了不同的方法来定量描述 3D μCT 图像中充气孔隙空间的配置,该图像是在不同基质电位下平衡的 20 个不同的肥沃土壤样本。尽管在此类多尺度材料上使用 μCT 进行的测量在很大程度上取决于图像分辨率,但我们的结果表明,一般来说,土壤样本的行为通常符合预期,例如,连接性随着负基质势的增加而增加,而曲折度降低。然而,在不同基质势下孔隙空间的定量描述符的演变与常规测量的宏观土壤参数之间无法找到简单的相关性。同时对所有土壤样本进行的统计分析证实了这种对应关系的缺乏。在不同基质势下孔隙空间的定量描述符的演变与常规测量的宏观土壤参数之间无法找到简单的相关性。同时对所有土壤样本进行的统计分析证实了这种对应关系的缺乏。在不同基质势下孔隙空间的定量描述符的演变与常规测量的宏观土壤参数之间无法找到简单的相关性。同时对所有土壤样本进行的统计分析证实了这种对应关系的缺乏。
更新日期:2023-06-01
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