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An investigation of atmospheric deposition and acid/base balance was carried out. The throughfall chemistry for the fluxes of Ca2+, K+, Mg2+, SO42?, NO3? and NH4+ ions in six coniferous stands in Bulgaria in a 2017 year was compared. Site Petrohan and Plana are used for long-term ecological monitoring and are sites included in LTER network, as well. The amount of acid throughfall deposition was higher than the base deposition fluxes in all study coniferous stands, except a site Plana. That revealed a high potentia...