Past and future changes in soil acidity and implications for forest growth under different deposition scenarios

Acid deposition is the most significant acidity input to the soil and the greatest cause of chemical change. The model calculations indicate that a large part of these chemical changes can be reversed within 10-30 yr if the acidity input is significantly reduced. Regional assessments based on the Swedish Forest Inventory suggest that deposition reductions of 80% for S and 50% for N as compared to the 1980 level will result in soil chemistry at steady state that will not be harmful to trees. -from Authors