簡易ガス拡散係数測定による土壌水分特性曲線の推定

概要

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Either in the laboratory or in-situ, obtaining hydraulic characteristics of soil in a large area has been time consuming and tedious work. In this paper, we examine a potential of a rapid method to estimate the water characteristic curve of soil from the diffusivity of oxygen in soil measured. Measuring diffusivity of oxygen in soil is more prompt than measuring hydraulic properties. Laboratory experiments were conducted using quartz sand. In the dry region of soil, estimates of oxygen diffusivity agreed well with measurements whereas the measurements started deviating from the estimates as increases in water content. The deviation from estimates might be attributed to a unique water characteristic curve of quartz sand or column material interface (PVC; hydrophobic and packed sand; hydrophilic) at which more gas permeable layer or developed. The proposed method would be promising; however, more studies are needed for other textural classes to utilize this in-situ measurement method.
生態工学会の論文
2006-04-30