par Basile-Doelsch, I.;Amundson, Ronald;Stone, William 
;Borschneck, Daniel;Bottero, J. Y.;Moustier, S.;Masin, Francis ;Colin, Fernand
Référence Geoderma, 137, 3-4, page (477-489)
Publication Publié, 2007
;Borschneck, Daniel;Bottero, J. Y.;Moustier, S.;Masin, Francis ;Colin, Fernand Référence Geoderma, 137, 3-4, page (477-489)
Publication Publié, 2007
Article révisé par les pairs
| Résumé : | 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. |
