A simple method for determining the gas diffusion coefficient in soils and its application to soil diagnosis and analysis of gas movement in soil
1998
Osozawa, S. (National Inst. of Agro-Environmental Sciences, Tsukuba, Ibaraki (Japan))
Soil is a surface part of the earth consisting of a solid phase, liquid phase and gas phase, where substances circulate. Carbon dioxide produced by the respiration and decomposition of roots and soil microorganisms is emitted into the gaseous phase in soil. The circulation of air between soil and atmosphere enables plants and soil microorganisms to live. Furthermore, some of the gas molecular particles in the atmosphere are drawn into the soil gas phase and absorbed and decomposed in soils. It contributes to the clean-up of the atmosphere. On the other hand, some toxic gases are emitted in the atmosphere from the soil. To analyze the relationship of the gas movement in soil with both plant production and atmospheric environment, studies on the gas movement in soil should be carried out. Although gas diffusion is the major factor controlling the gas exchange in soil, there are few studies on the measurements of gas diffusion and its applications. Therefore the present study was carried out to develop a simple method for determining the gas diffusion coefficient in soils, in order to apply it to the analysis of the soil structure and soil physical properties and to clarify the movement of CO2 under field conditions
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