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KOHLER, M. und HILDEBRAND, E. E. (2000): Influence of CO2-partial pressure in soil atmosphere on ion mobilisation at a gneiss site in the Black Forest, Germany.

Proceedings of the International IUFRO-Conference “Forest Ecosystems Restoration”, 10.-12. April 2000 in Vienna, 154-160.

 

The CO2-partial pressure in the soil atmosphere is an important key factor for ion mobilization in deeper soil horizons (e. g., B/C-horizons), provided the soil has a pH-level within the activity range of carbonic acid (i. e., pH >5). In order to examine the role of CO2-partial pressure we conducted laboratory experiments with naturally layered soil samples of a forested gneiss site located in south-west Germany (Black Forest). The laboratory tool allowed for the percolation of soil columns at a controlled water status near to field capacity and the control of the soil air composition during percolation. Different CO2-treatments (CO2 0-10 vol %) were used. For investigation of the short-term “mobilizable” ion pool, the solution circulated in a closed percolation system in order to obtain (quasi-) equilibrium soil pore solutions. Long-term mobilization processes were investigated by analyzing soil pore solutions in an open percolation system. The long-term studies aimed to quantify weathering processes in deeper soil horizons in which carbonic acid is the main trigger of protolytic solubilizations. Both the short- and long-term experiments revealed the key role of CO2-partial pressure in the soil atmosphere for ion mobilization in the transition zone between the pedo- and lithosphere. Disregarding the CO2-partial pressure in the soil atmosphere would lead to a significant underestimation of weathering rates.

 

 

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