Factors controlling Si export from soils: A soil column approach

Research output: Contribution to journalArticle

Abstract

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. (C) 2015 Elsevier B.V. All rights reserved.

Details

Authors
  • Benedicta Ronchi
  • Lucia Barao
  • Wim Clymans
  • Floor Vandevenne
  • Okke Batelaan
  • Gerard Govers
  • Eric Struyf
  • Alain Dassargues
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geochemistry

Keywords

  • Land use, Flux, Reactivity, Pedogenic Si, Biogenic Si
Original languageEnglish
Pages (from-to)85-96
JournalCatena
Volume133
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes