Biogenic Si; Pedogenic Si; Reactivity; Soils; soil profile; column tests; flux; land use
Abstract :
[en] The release of dissolved silicon (DSi) from A and B horizons was investigated with leaching tests on unsaturated columns. As forest A horizons have larger biogenic Si (BSi) pools than arable lands, we compared the Si release from a forest and a cropland from the same geographical region developed on a Luvisol in Belgium and a Cambisol in Sweden. The A horizons released a quickly dissolving Si fraction in contrast to the B horizons, which did contain
no or only little amounts of BSi and released lower Si concentrations. Our experiments show that Si export from forest soils is high because of the presence of a large reservoir of soluble BSi as well as due to the acidity of the soil (pH<4). Leaching at two different water fluxes revealed that export in forest soils was transport controlled while cropland soils were in equilibrium.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Ronchi, Benedicta; Katholieke Universiteit Leuven - KUL > Department of Earth and Environmental Sciences, > Hydrogeologie
Barao, Lucia; University of Antwerp > Department of Biology
Clymans, Wim; Lund University > Department of Geology
Vandevenne, Floor; University of Antwerp > Department of Biology
Batelaan, Okke; Flinders University > School of the Environment,
Govers, Gerard; Katholieke Universiteit Leuven - KUL > Department of Earth and Environmental Sciences,
Struyf, Eric; University of Antwerp > Department of Biology
Dassargues, Alain ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Factors controlling Si export from soils: A soil column approach
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