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Matzner, Egbert ; Prenzel, Jürgen:
Acid deposition in the German Solling area: effects on soil solution chemistry and Al mobilization.
In: Water, Air, & Soil Pollution.
Bd. 61
(1992)
.
- S. 221-234.
ISSN 1573-2932
DOI: https://doi.org/10.1007/BF00482606
Abstract
The A1 chemistry of soil solutions was evaluated in twoforest ecosystems in the North-German Solling area which isheavily impacted by acidic deposition. The principal H +buffering process in these soils is the release of A1 ions.Within the stand of Norway spruce, A1 concentrationsincrease with soil depth up to 370 umol/L. Ca/Al ratios ofthe soil solution decrease with depth and suggest high riskof A1 toxicity to tree roots and potential antagonisticeffects for ion uptake. The A1 concentrations of the soilsolution in the upper horizons do not appear to be inequilibrium with mineral phases of Gibbsite, Alunite andJurbanite as suggested by the depth gradients and temporalpatterns in ion activity products. Depletion of extractablesoil A1 in the upper horizons is occuring. The release ofA1 to the soil solution under these conditions seems to berestricted by kinetic constraints.