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- W2053865478 abstract "Soil air permeability (k a ) governs convective air and gas transport in soil. The increased use of soil venting systems during vadose zone remediation at polluted soil sites has created a renewed interest in k a and its dependency on soil type and soil air‐filled porosity (ε). Predictive k a (ε) models have only been tested within limited ranges of pore‐size distribution and total porosity. Andisols (volcanic ash soils) exhibit unusually high porosities and water retention properties. In this study, measurements of k a (ε) on 16 undisturbed Andisols from three locations in Japan were carried out in the soil matric potential interval from −10 cm H 2 O (near water saturation) to −15000 cm H 2 O (wilting point). Two simple power‐function k a (ε) models, both with measured k a at −100 cm H 2 O as a reference point, gave similar and good predictions of k a (ε) between −10 and −1000 cm H 2 O. For one location comprising finely textured and humic Andisols, both models largely underpredicted k a (ε) in dry soil (<−3000 cm H 2 O), suggesting a sudden occurrence of highly connected air‐filled pore networks during drainage. For the two other locations, the models satisfactorily predicted k a also in dry soil. Using recently published data for gas diffusivity and soil‐water retention together with the k a data in the Millington and Quirk (1964) fluid flow model, a plot of equivalent pore diameter as a function of soil matric potential was made for each soil. This plot, labeled a soil structure fingerprint (SSF), proved useful for illustrating effects of soil cultivation and high organic matter content on soil structure." @default.
- W2053865478 created "2016-06-24" @default.
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- W2053865478 date "2003-01-01" @default.
- W2053865478 modified "2023-10-07" @default.
- W2053865478 title "Air Permeability in Undisturbed Volcanic Ash Soils" @default.
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- W2053865478 doi "https://doi.org/10.2136/sssaj2003.3200" @default.
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