Fig. 9. Measured gas diffusivities and air permeabilities in L3 sandy clay loam and L5 sandy clay. (a), (c) Sieved, repacked soil. Model predictions (solid lines) by Eq. [5] and [12]. (b), (d) Undisturbed soil (closed symbols) and structurally disturbed soil (open symbols). Note the different k_a axes on (c) and (d). Data from present study and Schjønning et al. (1999)