Skip to Main content Skip to Navigation
Journal articles

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.
Document type :
Journal articles
Complete list of metadatas
Contributor : Thierry Pin <>
Submitted on : Thursday, August 23, 2012 - 6:22:06 PM
Last modification on : Friday, October 30, 2020 - 9:54:29 AM




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⟩



Record views