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Alewell, Christine ; Matzner, Egbert:
Reversibility of soil solution acidity and of sulfate retention in acid forest soils.
In: Water, Air, & Soil Pollution.
Bd. 71
(1993)
.
- S. 155-165.
ISSN 1573-2932
DOI: https://doi.org/10.1007/BF00475517
Abstract
To quantify the effects of reduced sulfate input on the chemistry of soil solution and soilS storage in acid forest soils, an experiment with undisturbed soil columns from two different siteswas implemented. The acid cambisol of the Soiling is subjected to a high sulfate input and especiallythe B-horizon has a high sulfate content. On the contrary, the podzol of the Fuhrberg site is subjectedto low input and has low sulfate content. Undisturbed soil columns were taken from both sites andwere irrigated at 6 ~ with a precipitation rate of 3 mm d -1 over 10 too. In treatment No. 1, an artificialthroughfall with pH 5.2 and reduced sulfate load (45 t~mol L -1) was applied. In treatment No. 2, anartificial througfall representing a high sulfate deposition (427 tzmol L 1, pH 3.2) was used. In caseof the Solling soil, the pH of soil solution was unaffected by treatments during the entire experiment.Alkalinity of the soil solution was slightly increased in treatment No. 1 at a depth of 20 cm. Whiletreatment No. 1 resulted in a reduction of the sulfate concentrations of the soil solution in the topsoil, sulfate concentrations were unaffected at a depth of 40 cm. The B-horizon of the Solling soilprevented deacidification of the soil solution by desorption of previously stored sulfate. In case ofthe Fuhrberg soil, treatment No. 1 resulted in reduced sulfate concentrations of the soil solution evenin deeper soil layers with concentrations approaching input levels. The pH of the solution was slightlyelevated and the alkalinity of the solution increased. Organic S compounds in the soil seemed to haveno influence on sulfate release in either soils.