Abstract
The aim of this paper was to analyse temporal changes in chemism of atmospheric deposition in Slovakia. Two kinds of deposition, bulk and throughfall were considered and analysed for the period of 1996-2010. Data acquired from permanent monitoring plots (PMP) of Level II were used for this purpose. These plots were established as a part of the ICP Forests Programme. The changes in the composition of deposition were identified for the spruce and beech plots. The results were compared among three spruce plots, two beech plots and one mixed spruce-beech-fir plot. Precipitation pH was higher on the beech than on the spruce plots and during the spotted period increased on both spruce and beech plots. Depositions of cations decreased significantly on the spruce and beech plots in bulk deposition for all elements except for calcium. The significant decline of sulphur and ammonium nitrogen was found on both spruce and beech plots, but the highest decrease of sulphur deposition was found in throughfall precipitation (R2 = 0.75). The amount of nitrate nitrogen did not change during the study period.