For systems open to the atmosphere, pC02 is C. 3xl0-4 atm. However, in soilspC02 (ranging from 10-2 to 10-1 atm; Bolt and Bruggenwert, 1976) is generallyhigher, due to respiration and oxidation of below-ground organic matter.Consequently, DIC concentrations tend to be higher in soil solutions than in surfacewater. Degassing of CO2 is common when soil water emerges (Reuss andJohnson, 1986).Carbon dioxide, dissolved in soil water, may react with minerals (includingfeldspars and calcite) according to:
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