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Figure 6


Fig. 6. Scatterplot comparison of predicted and measured log-transformed air permeability, log(ka), for lysimeter soils and field soils (shallow and deep soil layers). Predictive models for ka as a function of air-filled porosity [ka({varepsilon})]: (a) ka = ka,100({varepsilon}/{varepsilon}100)1+3/b (Eq. [14]); (b) ka = ka,100({varepsilon}/{varepsilon}100)X–1 (Eq. [15]); and (c) ka = 700(2{varepsilon}1003 + 0.04{varepsilon}100)({varepsilon}/{varepsilon}100)X–1 (Eq. [15] with Eq. [12]); where ka,100 and {varepsilon}100 are the values at matric potential of –100 cm H2O. Calculated RMSE values by Eq. [2] using log(ka) data are given.