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, Valérie; Peth, Stephan; Monga, Olivier; Vogel, Laure; Genty, Alain; Garnier, Patricia; Vieublé-Gonod, Laure; Ogurreck, Malte; Beckmann, Felix; Baveye, Philippe C.

doi:10.1016/j.advwatres.2015.08.006

Cited by 65 publications

(52 citation statements)

References 48 publications

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“…In another study, Pot et al. () used Lattice–Boltzmann simulations to predict the 3‐dimensional distribution of gas and water filled pore spaces in soil aggregates showing a very good match with the gas and water configuration measured by synchrotron‐based X‐ray microtomography. However, understanding the formation, evolution and stabilisation of microaggregate structures requires a combination of spatially explicit pore‐scale modeling approaches to account for the interplay between physical, biological and chemical processes.…”

Section: Microaggregate Properties and Functionsmentioning

confidence: 94%

“…For example, Khan et al (2012) have used a lattice Boltzmann model to simulate the permeability of a soil aggregate and have compared the results with the empirical formula of Kozeny-Carman, which relates permeability with porosity and the specific surface area, and found a good agreement between the two methods. In another study, Pot et al (2015) used Lattice-Boltzmann simulations to predict the 3-dimensional distribution of gas and water filled pore spaces in soil aggregates showing a very good match with the gas and water configuration measured by synchrotronbased X-ray microtomography. However, understanding the formation, evolution and stabilisation of microaggregate structures requires a combination of spatially explicit pore-scale modeling approaches to account for the interplay between physical, biological and chemical processes.…”

Section: Modeling Microaggregate Formation and Turnovermentioning

confidence: 97%

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Microaggregates in soils

Totsche

Amelung

Gerzabek

et al. 2017

J. Plant Nutr. Soil Sci.

670

439

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All soils harbor microaggregates, i.e., compound soil structures smaller than 250 μm. These microaggregates are composed of diverse mineral, organic and biotic materials that are bound together during pedogenesis by various physical, chemical and biological processes. Consequently, microaggregates can withstand strong mechanical and physicochemical stresses and survive slaking in water, allowing them to persist in soils for several decades. Together with the physiochemical heterogeneity of their surfaces, the three-dimensional structure of microaggregates provides a large variety of ecological niches that contribute to the vast biological diversity found in soils. As reported for larger aggregate units, microaggregates are composed of smaller building units that become more complex with increasing size. In this context, organo-mineral associations can be considered structural units of soil aggregates and as nanoparticulate fractions of the microaggregates themselves. The mineral phases considered to be the most important as microaggregate forming materials are the clay minerals and Fe-and Al-(hydr)oxides. Within microaggregates, minerals are bound together primarily by physicochemical and chemical interactions involving cementing and gluing agents. The former comprise, among others, carbonates and the short-range ordered phases of Fe, Mn, and Al. The latter comprise organic materials of diverse origin and probably involve macromolecules and macromolecular mixtures. Work on microaggregate structure and development has largely focused on organic matter stability and turnover. However, little is known concerning the role microaggregates play in the fate of elements like Si, Fe, Al, P, and S. More recently, the role of microaggregates in the formation of microhabitats and the biogeography and diversity of microbial communities has been investigated. Little is known regarding how microaggregates and their properties change in time, which strongly limits our understanding of micro-scale soil structure dynamics. Similarly, only limited information is available on the mechanical stability of microaggregates, while essentially nothing is known about the flow and transport of fluids and solutes within the micro-and nanoporous microaggregate systems. Any quantitative approaches being developed for the modeling of formation, structure and properties of microaggregates are, therefore, in their infancy. We respond to the growing awareness of the importance of microaggregates for the structure, properties and functions of soils by reviewing what is currently known about the formation, composition and turnover of microaggregates. We aim to provide a better understanding of their role in soil function, and to present the major unknowns in current microaggregate research. We propose a harmonized concept for aggregates in soils that explicitly considers the structure and build-up of microaggregates and the role of organo-mineral associations. We call for experiments, studies and modeling endeavors that will link informatio...

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Section: Microaggregate Properties and Functionsmentioning

confidence: 94%

Section: Modeling Microaggregate Formation and Turnovermentioning

confidence: 97%

Microaggregates in soils

Totsche

Amelung

Gerzabek

et al. 2017

J. Plant Nutr. Soil Sci.

670

439

View full text Add to dashboard Cite

show abstract

“…This link between soil structure and soil functioning is of fundamental importance for a range of environmental issues such as C protection in soil (Kravchenko et al, 2015), the response of soil to changing climatic boundary conditions or to agricultural practices (Pot et al, 2015), and the description of water solute and gas transport through the complex geometrical structure of soil pore space (Lehmann et al, 2006;Katuwal et al, 2015). Therefore, detailed knowledge of the geometrical attributes of soil pore network topology is essential to generate precise digital representations of soil-void boundaries at the pore scale to simulate soil processes such as the ones mentioned above, and to ensure that the outputs of such models adequately reflect the reality they purport to represent (Lehmann et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Lacunarity of soil macropore space arrangement of CT images: Effect of soil management and depth

2017

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“…Soil structure controls many important biophysical processes in soil-plant-microbial systems, related to microbial population dynamics, mass flow, nutrient cycling and uptake by roots (Young and Crawford, 2004). Besides, soil structure also influences soil's response to changes in the surrounding climate or to agriculture (Pot et al, 2015), carbon protection in soil or the transport of water and gas through its complex structure (Lehmann et al, 2006). In particular, many of these phenomena are strongly dependent on pore space geometry.…”

Section: Introductionmentioning

confidence: 99%

Minkowski Functionals of Connected Soil Porosity as Indicators of Soil Tillage and Depth

Martínez

Martı́n

García-Gutiérrez

2018

Front. Environ. Sci.

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We made use of 3D tomograms from X-ray computed tomography of soil samples from a vineyard in La Rioja (Spain), to explore the ability of Minkowski functionals of connected soil pore space to discriminate between different pore space geometries coming from soils with different management and depth and that, a priori, are expected to have some degree of dissimilarity. We estimate the volume of the connected pore space (V), the surface of the interface soil/void (S), the accumulated mean curvature of that interface (C), and its connectivity (E) out of 3D binary images taken from samples of two different depths of soil where two different managements were undertaken. Logit model showed that V, S, and C are needed to predict soil management and only V is required to infer depths. In our limited experimental circumstances, where we just explain two soil features, it seems natural that not all the four functionals are related to or needed to explain the variety of considered cases of soil structures. Therefore, this could not be an argument to dismiss Minkowski functionals as good candidates as predictors of the geometric structure of soil pore space. Our results suggest just the opposite, and they can be used as discriminants for a wide variety of soil features and behaviors.

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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

Cited by 65 publications

References 48 publications

Microaggregates in soils

Microaggregates in soils

Lacunarity of soil macropore space arrangement of CT images: Effect of soil management and depth

Minkowski Functionals of Connected Soil Porosity as Indicators of Soil Tillage and Depth

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