Abstract
Methods of analysis of salt distributions in soil profiles are developed and applied to interpret Cl − concentrations observed at 4 forested sites in south-western Australia. Both transient diffusion and steady-state diffusion-convection models are examined. The latter is favoured. The role of diffusion in Cl − transport at 3 of these sites is significant, and in a section of one profile it may dominate convection. Water extraction by roots appears to be restricted to depths of less than 6 m at 3 of the sites with little water moving downwards through the soil at this depth; only 0.06% of average rainfall at the driest site. Maxima in the observed Cl − profiles may result from water movement to greater depths through root channels, or essentially no convection in the lower profile, or a small upward flux of water in the lower region.
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