Coupling X-ray microtomography and macroscopic soil measurements: a method to enhance near-saturation functions?

Beckers, Éléonore; Plougonven, Erwan; Gigot, Nicolas; Léonard, Angélique; Roisin, Christian; Brostaux, Yves; Degré, A.

doi:10.5194/hess-18-1805-2014

Cited by 7 publications

(11 citation statements)

References 40 publications

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“…The resulting 3D quantification information regarding pores chambers connected by pores throats included pore localization, volumes, specific surface, connected surfaces, number of connections, deformation and inertia tensor. From those data, we calculated several microscopic parameters (Table 1) as well as the pore-size distribution with radius calculated from the assumption that pores were elliptic cylinders (Beckers et al, 2014a). After morphological processing in Avizo, we imported the binary images in ImageJ (Schneider et al, 2012) where the BoneJ plugin (Doube et al, 2010) functionalities were used; all the measurements into ImageJ were performed in 3D.…”

Section: Quantification Of Soil Microscopic Featuresmentioning

confidence: 99%

“…The isolated pores were actually connected to others by throats smaller than the voxel size and may not have drained at the required potential calculated from capillary law. Beckers et al (2014a) and Parvin et al (2017) applied nearly the same methodology to compare predicted SWRC with the bimodal version (Durner, 1994) of the van Genuchten (1980) model. On one hand, they only used macroscopic input data [from pressure plates weighting procedure for Beckers et al (2014a) and from the evaporation method for Parvin et al (2017)], and on the other hand, they used those macroscopic data in combination with microscopic data (pore-size distribution extracted from X-ray µCT images) as input.…”

Section: Air-filled Porosity At H = −1 Kpamentioning

confidence: 99%

“…Beckers et al (2014a) and Parvin et al (2017) applied nearly the same methodology to compare predicted SWRC with the bimodal version (Durner, 1994) of the van Genuchten (1980) model. On one hand, they only used macroscopic input data [from pressure plates weighting procedure for Beckers et al (2014a) and from the evaporation method for Parvin et al (2017)], and on the other hand, they used those macroscopic data in combination with microscopic data (pore-size distribution extracted from X-ray µCT images) as input. They both found that using the X-ray µCT data allows a better prediction of SWRC close to saturation in terms of RRMSE.…”

Section: Air-filled Porosity At H = −1 Kpamentioning

confidence: 99%

See 2 more Smart Citations

Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

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et al. 2018

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Section: Quantification Of Soil Microscopic Featuresmentioning

confidence: 99%

Section: Air-filled Porosity At H = −1 Kpamentioning

confidence: 99%

Section: Air-filled Porosity At H = −1 Kpamentioning

confidence: 99%

See 1 more Smart Citation

Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

Smet

Beckers

Plougonven

et al. 2018

Front. Environ. Sci.

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“…These objective algorithms have been used in a number of investigations (e.g., Beckers et al, 2014a,b; Houston et al, 2017), and new algorithms are appearing that do not require any parameter tuning (e.g., West et al, 2018), but so far they have not stopped the development of operator-dependent approaches (Kulkarni et al, 2012; Hashemi et al, 2014; Ojeda-Magana et al, 2014; Martin-Sotoca et al, 2017). Therefore, further progress is needed in this area, especially in order to segment images containing multiple distinct populations of voxels.…”

Section: Progress On the Physical Frontmentioning

confidence: 99%

Emergent Properties of Microbial Activity in Heterogeneous Soil Microenvironments: Different Research Approaches Are Slowly Converging, Yet Major Challenges Remain

et al. 2018

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Over the last 60 years, soil microbiologists have accumulated a wealth of experimental data showing that the bulk, macroscopic parameters (e.g., granulometry, pH, soil organic matter, and biomass contents) commonly used to characterize soils provide insufficient information to describe quantitatively the activity of soil microorganisms and some of its outcomes, like the emission of greenhouse gasses. Clearly, new, more appropriate macroscopic parameters are needed, which reflect better the spatial heterogeneity of soils at the microscale (i.e., the pore scale) that is commensurate with the habitat of many microorganisms. For a long time, spectroscopic and microscopic tools were lacking to quantify processes at that scale, but major technological advances over the last 15 years have made suitable equipment available to researchers. In this context, the objective of the present article is to review progress achieved to date in the significant research program that has ensued. This program can be rationalized as a sequence of steps, namely the quantification and modeling of the physical-, (bio)chemical-, and microbiological properties of soils, the integration of these different perspectives into a unified theory, its upscaling to the macroscopic scale, and, eventually, the development of new approaches to measure macroscopic soil characteristics. At this stage, significant progress has been achieved on the physical front, and to a lesser extent on the (bio)chemical one as well, both in terms of experiments and modeling. With regard to the microbial aspects, although a lot of work has been devoted to the modeling of bacterial and fungal activity in soils at the pore scale, the appropriateness of model assumptions cannot be readily assessed because of the scarcity of relevant experimental data. For significant progress to be made, it is crucial to make sure that research on the microbial components of soil systems does not keep lagging behind the work on the physical and (bio)chemical characteristics. Concerning the subsequent steps in the program, very little integration of the various disciplinary perspectives has occurred so far, and, as a result, researchers have not yet been able to tackle the scaling up to the macroscopic level. Many challenges, some of them daunting, remain on the path ahead. Fortunately, a number of these challenges may be resolved by brand new measuring equipment that will become commercially available in the very near future.

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“…Homogeneous and translationally invariant geometric objects have low lacunarity, while heterogeneous and nontranslationally invariant geometric objects have high lacunarity. Lacunarity can be used with both binary and quantitative data in one, two and three dimensions (Beckers et al, 2014;Dong, 2009;Xia et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

3D soil void space lacunarity as an index of degradation after land use change

et al. 2020

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In this work, lacunarity analysis is performed on soil pores segmented by the pure voxel extraction method from soil tomography images. The conversion of forest to sugarcane plantation was found to result in higher sugarcane soil pore lacunarity than that of native forest soil, while the porosity was found to be lower. More precisely, this study shows that native forest has more porous soil with a more uniform spatial distribution of pores, while sugarcane soil has lower porosity and a more heterogeneous pore distribution. Moreover, validation through multivariate statistics demonstrates that lacunarity can be considered a relevant index of clustering and can explain the variability among soils under different land use systems. While porosity by itself represents a fundamental concept for quantification of the impact of land use change, the current findings demonstrate that the spatial distribution of pores also plays an important role and that pore lacunarity can be adopted as a complementary tool in studies directed at quantifying the effect of human intervention on soils.

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Coupling X-ray microtomography and macroscopic soil measurements: a method to enhance near-saturation functions?

Cited by 7 publications

References 40 publications

Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

Emergent Properties of Microbial Activity in Heterogeneous Soil Microenvironments: Different Research Approaches Are Slowly Converging, Yet Major Challenges Remain

3D soil void space lacunarity as an index of degradation after land use change

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