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; DP = 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).