Fig. 7. Depth distribution of log-transformed air permeability, log(ka), for (a, b, and c) Gjorslev and (d, e, and f) Mammen at three different soil-water matric potentials of 20, 50, and 160 cm H2O. Averaged measured data and standard deviation of log(ka) are shown. Predicted log(ka) by three different models for ka as a function of air-filled porosity [ka(
)], ka = ka,100(
/
100)1+3/b, ka = (890
1002.5)(
/
100)X1, and ka = 700(2
1003 + 0.04
100)(
/
100)X1, are given, where ka,100 and
100 are the values at matric potential of 100 cm H2O.