Weathering and pedogenesis at the watershed scale: some recent lessons from studies of acid-deposition effects. Velbel, M. Chemical Geology, 1993.
Weathering and pedogenesis at the watershed scale: some recent lessons from studies of acid-deposition effects. [pdf]Paper  abstract   bibtex   
Geochemical mass balance is commonly used to calculate mineral weathering rates. Such studies invariably find higher present-day rates and generally conclude that the higher rates are a consequence of recent environmental acidification. However, because the residual solids which are the basis of the long-term estimate are time-integrated accumulations of weathering products, it may be inappropriate to compare short-term rates from solute input-output budgets with0long-term rates from bulk profile chemistry. There are disparities in both the time-scales over which the two methods measure rates, and the volume fraction of the regolith being sampled. Soils better integrate time; solute budgets better integrate space.

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