Articles | Volume 8, issue 4
https://doi.org/10.5194/se-8-737-2017
https://doi.org/10.5194/se-8-737-2017
Research article
 | 
04 Jul 2017
Research article |  | 04 Jul 2017

Land use change affects biogenic silica pool distribution in a subtropical soil toposequence

Dácil Unzué-Belmonte, Yolanda Ameijeiras-Mariño, Sophie Opfergelt, Jean-Thomas Cornelis, Lúcia Barão, Jean Minella, Patrick Meire, and Eric Struyf

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Cited articles

Alexandre, A., Meunier, J.-D., Colin, F., and Koud, J.-M.: Plant impact on the biogeochemical cycle of silicon and related weathering processes, Geochim. Cosmochim. Ac., 61, 677–682, https://doi.org/10.1016/S0016-7037(97)00001-X, 1997.
Ameijeiras-Mariño, Y.: Changes in soil chemical weathering intensity after forest conversion to cropland: importance of slope geomorphology, in: The response of soil chemical weathering to physical erosion: integrating the impact of forest conversion, edited by: Université catholique de Louvain (UCL), PhD thesis, Belgium, 2017.
Barão, L., Clymans, W., Vandevenne, F., Meire, P., Conley, D. J., and Struyf, E.: Pedogenic and biogenic alkaline-extracted silicon distributions along a temperate land-use gradient, Eur. J. Soil Sci., 65, 693–705, https://doi.org/10.1111/ejss.12161, 2014.
Barão, L., Vandevenne, F., Clymans, W., Frings, P., Ragueneau, O., Meire, P., Conley, D. J., and Struyf, E.: Alkaline-extractable silicon from land to ocean: A challenge for biogenic silicon determination, Limnol. Oceanogr. Methods, 13, 329–344, https://doi.org/10.1002/lom3.10028, 2015.
Bartoli, F.: Crystallochemistry and surface properties of biogenic opal, J. Soil Sci., 36, 335–350, https://doi.org/10.1111/j.1365-2389.1985.tb00340.x, 1985.
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We studied the effect of land conversion and erosion intensity on the biogenic silica (BSi) pools in a subtropical soil in the south of Brazil. Our study shows that deforestation will rapidly (< 50 years) deplete (10–53 %) the biogenic alkaline extractable Si (AlkExSi) pool in soils. Higher erosion in steeply sloped sites implies increased deposition of biogenic Si in deposition zones near the bottom of the slope, where rapid burial can cause removal of BSi from biologically active zones.