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Fig. 7. Comparison of the three-porosity model (TPM) and the Millington and Quirk (1961) model (MQ) with measured data for field soils at Gjorslev at the (a) 0.43-m, (b) 2.15-m, and (c) 4.75-m depth. The average of soil-gas diffusivities (Dp/D0) at each matric-potential (
) stage are shown in the plots. The standard deviations of both air-filled porosity 
and Dp/D0 are shown in error bars. Average values of the Campbell pore-size distribution parameter b are also given.
