Description:
<p>The critical loads of acid deposition have been mapped for Swedish forest soils using PROFILE at 1804 within the Swedish Forest Inventory. The results of the calculations show that Swedish forest soils are sensitive to acid deposition. A deposition reduction of 85% for sulphur deposition and 40% for nitrogen deposition in relation to the 1980 deposition level is required in order to protect 95% of the forest resource in Sweden. This corresponds to a target load of &gt6 kg S<tex-math>$\text{ha}^{-1}$</tex-math>
<tex-math>$\text{yr}^{-1}$</tex-math>in southern Sweden, 4 kg S<tex-math>$\text{ha}^{-1}$</tex-math>
<tex-math>$\text{yr}^{-1}$</tex-math>in center Sweden and 3 kg<tex-math>$\text{ha}^{-1}$</tex-math>
<tex-math>$\text{yr}^{-1}$</tex-math>in northern Sweden. Under 1992 deposition level, still 75% of the forested area receive higher acid deposition than the critical load. The critical loads will be exceeded in 30% of the forest area under the deposition levels to be reached in 2010 according to current emission reduction plans. Forest soils in Sweden are at present still undergoing further acidification.</p>