The ideas concerning the spatial and temporal variation of acidity and composition of atmospheric fallout in forests of the boreal zone are discussed. The role played by the atmospheric component in the functioning of these forests depends on the acidity and composition of fallout and the extent of their transformation by the biocenosis. The most profound transformation of fallout occurs during the growing season. In spaces between crowns, the corresponding changes are atmogenic; in undercrown areas, they are obviously biogenic (autogenic). Spruce transforms the fallout more intensively than pine. Under conditions of industrial pollution, the atmobiogenic character of fallout is supplemented with a technogenic component, as its acidity and concentration of pollutants and other elements sharply increase. Concentrations of principal cations reach high values because of their leaching from the crown by acid precipitation. The traditional concept of atmospheric load on boreal forests should be reconsidered taking into account their spatial structure.
Russian Journal of Ecology – Springer Journals
Published: Feb 1, 2008
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