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| Alewell, C; Matzner, E: Reversibility of soil solution acidity and of sulfate retention in acid forest soils, Water, Air and Soil Pollution, 71, 155-165 (1993) | |
Abstract:
To quantify the effects of reduced sulfate input on the chemistry of soil solution and soil
S storage in acid forest soils, an experiment with undisturbed soil columns from two different sites
was implemented. The acid cambisol of the Soiling is subjected to a high sulfate input and especially
the B-horizon has a high sulfate content. On the contrary, the podzol of the Fuhrberg site is subjected
to low input and has low sulfate content. Undisturbed soil columns were taken from both sites and
were irrigated at 6 ~ with a precipitation rate of 3 mm d -1 over 10 too. In treatment No. 1, an artificial
throughfall with pH 5.2 and reduced sulfate load (45 t~mol L -1) was applied. In treatment No. 2, an
artificial througfall representing a high sulfate deposition (427 tzmol L 1, pH 3.2) was used. In case
of 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. While
treatment No. 1 resulted in a reduction of the sulfate concentrations of the soil solution in the top
soil, sulfate concentrations were unaffected at a depth of 40 cm. The B-horizon of the Solling soil
prevented deacidification of the soil solution by desorption of previously stored sulfate. In case of
the Fuhrberg soil, treatment No. 1 resulted in reduced sulfate concentrations of the soil solution even
in deeper soil layers with concentrations approaching input levels. The pH of the solution was slightly
elevated and the alkalinity of the solution increased. Organic S compounds in the soil seemed to have
no influence on sulfate release in either soils. |
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