Mediterranean forest ecosystems are among the most endangered in our country, anddue to the general benefits they provide, they are ofexceptional importance. With climate change, they are exposed to the influence of atmospheric deposition which can be an additional source of nutrients, but also a source of pollution that causes serious andfar-reachingconsequences. Although there are studies explaining the impact of forests on the spatial distribution and chemical composition of precipitation that reaches forest soil, soil solution, and streamwaters, there is little data available on pine forests in the Mediterranean. The aims of the research were to determine the concentrations and loads of ions deposited by atmospheric deposition in the ecosystems of Aleppo and black pine, and to determine the role of their canopies in the dynamics of the movement ofionscoming from the atmosphere. To estimate the actual loads of acid and nitrogen deposition and compare them with empirical critical loads, and to determine the input and dynamics of the movement of ions deposited by atmospheric deposition in soil solution and streamwaters. The research area is the central Dalmatian watershed area at the site of Aleppo and black pine. On each site, experimental plots were selected (inside the forest, outside the forest, and on a burned site). Collection, sampling, and analysis of all water samples were done according to the ICP methodology. The highest concentrations of ions in the forest were determined after a dry period, which is due to the seasonality of precipitation and washing off dry deposited particles from tree canopies, which is particularly noticeable in Aleppopine forests. It was found that actual nitrogen loadsexceededcritical loadsforAleppopine forests, but not for blackpine forests. Itwas alsofound that the load of acid compounds in Aleppo and black pine forests does not differ. Comparing ion concentrations in precipitation with ion concentrations in soil solution collected by lysimeters on all experimental plots, it was found that the concentrations of all ions were higher in soil solutions. Also, the ions concentrations in soil solutions in forest below the forest floor, the mineral part of the soil, were higher than in soil solutions outside the forest and in soil solutions on the burned site. It was found that only the concentrations of NO3- and NH4+ in streamwater were comparable to atmospheric deposition.