Fig. 5. Measured tortuosities as a function of fluid-phase content in the soil liquid phase (from solute diffusion data, = ) and soil gaseous phase (from gas diffusion data, = ) for (a) four sieved, repacked soils and (b) undisturbed compared with sieved, repacked L1 soil. Data from Olesen et al. (1996)(1999), Schjønning et al. (1999), and Moldrup et al. (2000b)