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Mineral control of carbon pools in a volcanic soil horizon

Abstract : The aim of this study was to characterize carbon sequestration by mineralogical control at the scale of a volcanic soil horizon. We adapted the classical density fractionation procedure and focused on the heavy fractions (> 1.9), which we divided into eight organomineral fractions. We characterized them simultaneously through non-destructive mineralogical analyses (XRD and NMR of Al and Si) and organic carbon analyses. The results showed that the largest proportion (82.6%) of organic matter in the horizon was associated with minerals in organomineral complexes. Imogolite type materials bound 6-fold more OM than anorthoclase, and 3.5-fold more OM than iron oxides. In addition, we observed a degree of polymerization of imogolite type materials that was midway between that of allophane and Al in Al-humus complexes. In conclusion, the results of this density fractionation combined with a mineralogical approach suggested that OM in the heavy fractions could be divided into several pools depending on the nature of the minerals. (c) 2006 Elsevier B.V. All rights reserved.
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https://hal.archives-ouvertes.fr/hal-00725084
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Submitted on : Thursday, August 23, 2012 - 6:22:06 PM
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Isabelle Basile-Doelsch, R. Amundson, W. E. E. Stone, Daniel Borschneck, Jean-Yves Bottero, et al.. Mineral control of carbon pools in a volcanic soil horizon. Geoderma, Elsevier, 2007, 137, pp.477-489. ⟨10.1016/j.geoderma.2006.10.006⟩. ⟨hal-00725084⟩

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