Fig. 1. Water retention (open symbols) and gas diffusivity (solid symbols) for Miura 4 Andisol. Measurements on three closely sampled 100-cm³ undisturbed soil samples are shown. The solid line is the Campbell (1974) soil-water characteristic model fitted to data. = volumetric water content, m³ m^-3; D_P = gas diffusion coefficient in soil, m³ soil air m^-1 soil s^-1; D₀ = gas diffusion coefficient in free air, m² air s^-1; pF = Log(- in cm H₂O).

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