Soil Morphology and Soil Physical Properties. I. Soil Aeration

Ayres, K. W.; Button, R. G.; Jong, E. de

doi:10.4141/cjss72-043

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…At low air porosity values, the relative diffusion coefficient tends to decrease quicker than at higher porosities. Increase in water content decreases the air porosity and increases marginal and remote pores due to the formation of interparticle water films causing large decrease in diffusion coefficient [28]. Such effects are shown in Figs.…”

Section: Effect Of Granular Media Properties On Diffusion Coefficientmentioning

confidence: 93%

“…They are also structurally nonrigid and could collapse at high moisture contents [25]; resulting in significant reduction of diffusion coefficient values. Swelling and shrinking are common in compost and compost amended soils [28]. Cabral et al [30] also observed the effect of degree of saturation on diffusion coefficient for de-inking byproduct organic rich residue.…”

Section: Effect Of Granular Media Properties On Diffusion Coefficientmentioning

confidence: 94%

“…2 and 3. The trend is expected to continue until diffusion ceases and all axial and marginal pores are blocked by a water film [28,29]. The effect is more significant in compost and soil-compost mixtures than in mineral soil.…”

Section: Effect Of Granular Media Properties On Diffusion Coefficientmentioning

confidence: 96%

See 2 more Smart Citations

Methane diffusion coefficient in compost and soil–compost mixtures in gas phase biofilter

Pokhrel¹,

Hettiaratchi²,

Kumar³

2011

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Section: Effect Of Granular Media Properties On Diffusion Coefficientmentioning

confidence: 93%

Section: Effect Of Granular Media Properties On Diffusion Coefficientmentioning

confidence: 94%

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Methane diffusion coefficient in compost and soil–compost mixtures in gas phase biofilter

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Plant decomposition and soil respiration in terrestrial ecosystems

1977

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Water Vapor Diffusion Through Soil as Affected by Temperature and Aggregate Size

Jabro

2008

Transp Porous Med

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Water vapor diffusion through the soil is an important part in the total water flux in the unsaturated zone of arid or semiarid regions and has several significant agricultural and engineering applications because soil moisture contents near the surface are relatively low. Water vapor diffusing through dry soil is absorbed for both long and short terms. Long-term absorption allows more water to enter than exit the soil, as reflected in the concentration gradient. Short-term absorption leads to an apparent reduction in the diffusion rate, as reflected in the diffusion coefficient. This investigation studied the effects of soil temperature and porosity on the isothermal diffusion of water vapor through soil. The diffusion model consisted of 25.4 cm × 8.9 cm × 20.3 cm Plexiglas box divided into two compartments by a partition holding a soil reservoir. Water vapor moved from a container suspended by a spring in one compartment, through the porous medium in the center of the model, to calcium chloride in a container suspended by a spring in the other compartment. The porous materials consisted of aggregates of varying size (2-2.8, 1-2, and 0.5-1 mm) of a Fayatte silty clay loam (a fine-silty, mixed mesic Typic Hapludalf). The flow rates of water vapor were measured at temperatures of 10, 20, 30, and 40 • C. Warmer temperatures increased the rate of diffusion through dry soil while reduced the amount of water absorbed by that soil. Reducing porosity slowed the rate of diffusion and increased the amount of water absorbed. The dry soil in this study absorbed from 1/8 to 2/3 of the diffusing water. Maximum absorption rates occurred with the most compact soil samples at the highest temperature, though the maximum absorption as a percentage of the diffusing water was in the compact samples at the lowest temperature. The diffusivity equation D/D 0 = [(S − 0.1)/0.9] 2 fit the D/D 0 values obtained from these data if a coefficient of 1/3 or 1/3.5 is added to correct for the time delays caused by temporary sorption of the diffusing water vapor. The data, influenced by the interaction of water vapor Mention of trade names, proprietary products, or specific equipment is intended for reader information only and does not constitute a guarantee or warranty by the USDA-ARS nor does it imply approval of the product named to the exclusion of other products.

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Soil Morphology and Soil Physical Properties. I. Soil Aeration

Cited by 11 publications

References 7 publications

Methane diffusion coefficient in compost and soil–compost mixtures in gas phase biofilter

Methane diffusion coefficient in compost and soil–compost mixtures in gas phase biofilter

Plant decomposition and soil respiration in terrestrial ecosystems

Water Vapor Diffusion Through Soil as Affected by Temperature and Aggregate Size

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