Fig. 4. Comparison of air permeability (k_a) and relative gas diffusivity (D_P/D₀) as a function of soil-air content () for the Tsumagoi 6 Andisol. Measurements on three closely spaced soil cores. The solid line is a predictive model with reference-point at -100 cm H₂O of matric potential and with = 2.

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