Abstract
Water samples have been collected from two forested catchments in the Slavkovsky les Mountains of western Bohemia, in the Czech Republic. The objective of the study was to compare and contrast elemental fluxes in two catchments with similar conditions of climate, topography, vegetation over and acidic atmospheric deposition, but very different bedrock geology. The Lysina catchment is underlain by slow-weathering leucocratic granite. Soils are podzolized brown earths and peaty gleys with small pools of exchangeable basic cations. Both soils and drainage water at Lysina are acidified by atmospheric deposition. Surface runoff was found to be dominated by sulphate and dissolved silica, accompanied by high concentrations of H+ (volume weighted pH = 3.87). Stream water also displayed extremely high concentrations of total aluminum (volume-weighted mean 66 μmol.l−1). Inorganic monomeric aluminum was the predominant aluminum fraction present, which contained mainly aquo-Al (Al3+ and fluoride complexes.
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