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Fig. 4. Test of the Buckingham-Burdine-Campbell (BBC), Eq. [5], and the macroporosity-dependent ( ${epsilon}$ ₁₀₀) (Eq. [7]), gas diffusivity models against measured data for four undisturbed Gray-lowland soils (paddy field soils). Values of Campbell b and total porosity ( ${Phi}$ , m³ m^-3) for each soil are given. ${epsilon}$ = soil air content; D_P/D₀ = relative soil-gas diffusion coefficient, with D_P as the gas diffusion coefficient in soil, m³ soil air m^-1 soil s^-1.