The influence of forest and soil properties on changes in soil solution concentration upon a reduction deposition was examined for five forest-soil combinations with the dynamic RESAM model. Predicted concentrations decreased in the direction Douglas fir - Scotch pine - oak, due to decreased filtering of dry deposition and increased precipitation surplus. The influence of the non-calcareous sandy soils on the soil solution concentrations was small and caused by differences in nitrogen transformation rates. In all forest-soil combinations, a reduction in deposition level increased the pH and decreased sulphate, nitrate, ammonium and aluminium concentrations. Differences in de-acidification were caused by differences in biocycle and denitrification.