This work investigates the input of H+ ions as a constituent of acid deposition in a series of beech stands with modified densities. The research was conducted in the Kremnické vrchy Mts during 1994–2008. The highest average amounts of H+ ions at 14.4 mmol H+.day-1 m-2 were recorded on a plot subjected to heavy silvicultural intervention, while the lowest average amounts were observed on the original intact plot with 12.4 mmol H+.day-1 m-2. The variation coefficient values did not exceed 30%, and this indicates rather uniform ecological conditions in the study plots. The tests herein confirmed a significant influence of silvicultural intervention on the amount of H+ ions entering the stand.