Detection of soil water in macropores of undisturbed soil using microfocus X-ray tube computerized tomography (μCT)

Tippkötter, Rolf; Eickhorst, Thilo; Taubner, Heidi; Gredner, Beke; Rademaker, Guido

doi:10.1016/j.still.2009.05.001

Cited by 71 publications

(50 citation statements)

References 28 publications

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“…As was also found by Tippkötter et al [47] and generally unlike in the case of images obtained with table-top, polychromatic X-ray computed tomography scanners [5,23,24,25], the histograms of the 3D SR-µCT images of the soil samples display three distinct peaks (Fig. 1).…”

Section: Sr-µct Scanssupporting

confidence: 69%

“…They are able under these conditions to clearly observe pendular rings of water between two clayloam soil aggregates at a resolution close to 6 µm. Tippkötter et al [47] adopt a similar focus, in undisturbed soil samples, and are able with a table-top X-ray CT scanner to visualize the presence of water films coating the inner surfaces of meso-and macropores. These data obtained by Carminati et al [11] and Tippkötter et al [47], or equivalent CT data obtained in other soils, could in principle be used to assess whether existing pore-scale models of water distribution in soils are adequate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Pot

Peth

Monga

et al. 2015

Advances in Water Resources

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Section: Sr-µct Scanssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Pot

Peth

Monga

et al. 2015

Advances in Water Resources

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“…Others have reported resolution down to 1 µm when using an X-ray scanner optimized for smaller sample sizes (e.g. Tippkötter et al, 2009). By using a monochromatic X-ray source Voltolini et al (2017) imaged soil micro-aggregates with a sub-micron resolution.…”

Section: Discussionmentioning

confidence: 99%

Quantitative imaging of the 3-D distribution of cation adsorption sites in undisturbed soil

Keck

Strobel

Gustafsson

et al. 2017

SOIL

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Abstract. Several studies have shown that the distribution of cation adsorption sites (CASs) is patchy at a millimetre to centimetre scale. Often, larger concentrations of CASs in biopores or aggregate coatings have been reported in the literature. This heterogeneity has implications on the accessibility of CASs and may influence the performance of soil system models that assume a spatially homogeneous distribution of CASs. In this study, we present a new method to quantify the abundance and 3-D distribution of CASs in undisturbed soil that allows for investigating CAS densities with distance to the soil macropores. We used X-ray imaging with Ba 2+ as a contrast agent. Ba 2+ has a high adsorption affinity to CASs and is widely used as an index cation to measure the cation exchange capacity (CEC). Eight soil cores (approx. 10 cm 3 ) were sampled from three locations with contrasting texture and organic matter contents. The CASs of our samples were saturated with Ba 2+ in the laboratory using BaCl 2 (0.3 mol L −1 ). Afterwards, KCl (0.1 mol L −1 ) was used to rinse out Ba 2+ ions that were not bound to CASs. Before and after this process the samples were scanned using an industrial X-ray scanner. Ba 2+ bound to CASs was then visualized in 3-D by the difference image technique. The resulting difference images were interpreted as depicting the Ba 2+ bound to CASs only. The X-ray image-derived CEC correlated significantly with results of the commonly used ammonium acetate method to determine CEC in well-mixed samples. The CEC of organic-matter-rich samples seemed to be systematically overestimated and in the case of the clay-rich samples with less organic matter the CEC seemed to be systematically underestimated. The results showed that the distribution of the CASs varied spatially within most of our samples down to a millimetre scale. There was no systematic relation between the location of CASs and the soil macropore structure. We are convinced that the approach proposed here will strongly aid the development of more realistic soil system models.

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“…A tomografia computadorizada também permite a obtenção de imagens em um tempo relativamente curto, mesmo em sistemas de primeira geração (horas), quando comparada com a micromorfologia (semanas ou meses). Sistemas de segunda geração são capazes de gerar imagens em 3D, com resoluções micrométricas e aquisição da imagem em minutos, sendo ferramentas interessantes para uma melhor caracterização do solo (Tippkotter et al, 2009).…”

Section: Resultsunclassified

Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

Pires

Bacchi

2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar, em escala milimétrica, a modificação da densidade e da porosidade de amostras deformadas de solo submetidas a ciclos de umedecimento e secamento (U-S), por meio da tomografia computadorizada de raios gama. Amostras com 98,1 cm 3 foram preparadas procedendo ao peneiramento do solo em malha de 2 mm e acondicionamento de forma homogênea em tubos de PVC. As amostras de solo foram submetidas a um, dois e três ciclos de U-S. As amostras controle não foram submetidas a nenhum ciclo de U-S. Após a aplicação dos ciclos de U-S, a porosidade das amostras diminuiu e as camadas de solo se adensaram. Os dados de tomografia computadorizada permitiram análise contínua da densidade do solo e de sua porosidade, em camadas milimétricas (0,08 cm), o que não pode ser alcançado facilmente por métodos tradicionais usados em física do solo.Termos para indexação: análise de imagens, atenuação de raios gama, ciclos de umedecimento e secamento, densidade do solo, porosidade do solo. Soil structure changes evaluated with computed tomographyAbstract -The objective of this work was to evaluate in millimetric scale changes in soil bulk density and porosity, using the gamma-ray computed tomography in soil samples with disturbed structure due to wetting and drying (W-D) cycles. Soil samples with 98.1 cm 3 were sieved using a 2 mm mesh and homogenously packed in PVC cylinders. Soil samples were submitted to 1, 2, and 3 W-D cycles. Control samples were not submitted to W-D cycles. After repetitions of W-D cycles, soil sample porosity decreased and soil layers became denser. Computed tomography allowed a continuous analysis of soil bulk density and also soil porosity along millimetric (0.08 cm) layers, what cannot be provided by traditional methods used in soil physics.

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Detection of soil water in macropores of undisturbed soil using microfocus X-ray tube computerized tomography (μCT)

Cited by 71 publications

References 28 publications

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Three-dimensional distribution of water and air in soil pores: Comparison of two-phase two-relaxation-times lattice-Boltzmann and morphological model outputs with synchrotron X-ray computed tomography data

Quantitative imaging of the 3-D distribution of cation adsorption sites in undisturbed soil

Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada

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