Gaseous diffusion in porous media. Part 3 - Wet granular materials

Currie, J. A.

doi:10.1088/0508-3443/12/6/303

Cited by 119 publications

(68 citation statements)

References 12 publications

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“…The similar power-law function relationship D=D 0 / e c eff was also observed by other authors in various fields, such as gas diffusion in variable saturated porous materials [17,51,24,28], electron diffusion on porous film [6,19], and simulation studies [14]. Attempts have been made to explain Archie's law using percolation models [24,23].…”

Section: Theorysupporting

confidence: 75%

Analytical modeling of one-dimensional diffusion in layered systems with position-dependent diffusion coefficients

Liu

Cheng

2008

Advances in Water Resources

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Section: Theorysupporting

confidence: 75%

Analytical modeling of one-dimensional diffusion in layered systems with position-dependent diffusion coefficients

Liu

Cheng

2008

Advances in Water Resources

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“…Soil aggregates may support a different microbial community than the bulk soil by imposing size exclusion on select biota from restricted pore domains (4,12), minimizing predation (90), and/or decreasing competition as a conse-quence of lower water tensions (84). Furthermore, anaerobic microsites have been observed within both natural (75) and artificial (46,68) soil aggregates, resulting as a consequence of O 2 consumption rates exceeding diffusive flux rates (14,25). Anaerobiosis within aggregates may result in the colonization of microbes able to utilize alternative electron acceptors, such as nitrate (63), sulfate, and Fe(III), present as (hydr)oxides comprising the mineral fraction of the aggregate.…”

mentioning

confidence: 99%

Changes in Bacterial and Archaeal Community Structure and Functional Diversity along a Geochemically Variable Soil Profile

Hansel

Fendorf

Jardine

et al. 2008

Appl Environ Microbiol

427

257

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Spatial heterogeneity in physical, chemical, and biological properties of soils allows for the proliferation of diverse microbial communities. Factors influencing the structuring of microbial communities, including availability of nutrients and water, pH, and soil texture, can vary considerably with soil depth and within soil aggregates. Here we investigated changes in the microbial and functional communities within soil aggregates obtained along a soil profile spanning the surface, vadose zone, and saturated soil environments. The composition and diversity of microbial communities and specific functional groups involved in key pathways in the geochemical cycling of nitrogen, Fe, and sulfur were characterized using a coupled approach involving cultivation-independent analysis of both 16S rRNA (bacterial and archaeal) and functional genes (amoA and dsrAB) as well as cultivation-based analysis of Fe(III)-reducing organisms. Here we found that the microbial communities and putative ammonia-oxidizing and Fe(III)-reducing communities varied greatly along the soil profile, likely reflecting differences in carbon availability, water content, and pH. In particular, the Crenarchaeota 16S rRNA sequences are largely unique to each horizon, sharing a distribution and diversity similar to those of the putative (amoA-based) ammonia-oxidizing archaeal community. Anaerobic microenvironments within soil aggregates also appear to allow for both anaerobic-and aerobic-based metabolisms, further highlighting the complexity and spatial heterogeneity impacting microbial community structure and metabolic potential within soils.

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“…According to Currie (1961), the D ⁄ D 0 -AFP curve of a porous medium is divided into two sections of slope, before and after the inflection point. Inter-aggregate and intra-aggregate pores affect the shape of the curve and observations of the inflection point on the D ⁄ D 0 -AFP curve of the WTR can be explained as follows.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the physical properties of water treatment residue for use as a soil substitute compared with decomposed granite soil

Park

Ohashi

Kurosawa

et al. 2010

Soil Science and Plant Nutrition

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To evaluate water treatment residue (WTR) as a soil substitute material, its physical properties were investigated and compared with decomposed granite soil (DGS). For comparison purposes, relative gas diffusivity (D ⁄ D 0 ), saturated hydraulic conductivity (K s ), water retention curve, porosity and readily available water were measured for both the WTR and the DGS. The measured D ⁄ D 0 , K s , water retention ability and porosity were higher for the WTR than for the DGS. These differences may be attributable to intra-aggregate and inter-aggregate pores created in the WTR through binding of silt and clay particles in the flocculation process. The behavior of water and gasses surrounding these pores may explain the physical properties of the WTR. The characteristics measured in this evaluation indicate that WTR has good potential for reuse as a soil substitute material.

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Gaseous diffusion in porous media. Part 3 - Wet granular materials

Cited by 119 publications

References 12 publications

Analytical modeling of one-dimensional diffusion in layered systems with position-dependent diffusion coefficients

Analytical modeling of one-dimensional diffusion in layered systems with position-dependent diffusion coefficients

Changes in Bacterial and Archaeal Community Structure and Functional Diversity along a Geochemically Variable Soil Profile

Evaluation of the physical properties of water treatment residue for use as a soil substitute compared with decomposed granite soil

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