BIOGEOCHEMISTRY OF SMALL CATCHMENTSgetmaybeconstructed. Protonbudgets,whichexpresstherelativeimportanceofall major sources and sinks of acidity, have been used extensively in acidificationresearch (Driscoll and Likens, 1982; van Breemen et aI., 1983). Major sources ofprotons include CO2 dissolution in water, cation assimilation, nitrification andatmospheric acid deposition, while major sinks are cation exchange and chemicalweathering.
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