Author： van Haesebroeck V. Boeye D. Verhagen B. Verheyen R.F.
Publisher： Springer Publishing Company
ISSN： 0168-2563
Source： Biogeochemistry, Vol.37, Iss.1, 1997-04, pp. : 15-32
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Abstract
Intact rich fen soil cores with controlled water levels near the surface were installed in an open greenhouse. To simulate short term summer drought, water levels were lowered (20 cm) after two weeks in half of the cores (experimental cores) and remained near the surface in the other half (blanks). After two more weeks, the water levels were brought back to the surface in the experimental cores and remained there for another two weeks. In the blanks, reduction and alkalinization of the top peat layer occurred. In the experimental soil cores oxidation and acidification started within one week after drawdown. An indication for a drought induced rise in soluble reactive phosphorus has been found. The velocity of the acidification process illustrates the dynamic nature of the hydrochemical conditions in fen soils during drought. The processes controlling the acid/base status of rich fen, the effect of drought induced acidification on P availability and the significance for the vegetation are discussed.
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