%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Basile Doelsch, Isabelle
%A Amundson, R.
%A Stone, W. E. E.
%A Borschneck, D.
%A Bottero, J. Y.
%A Moustier, S.
%A Masin, F.
%A Colin, Fabrice
%T Mineral control of carbon pools in a volcanic soil horizon
%D 2007
%L fdi:010037811
%G ENG
%J Geoderma
%@ 0016-7061
%K density fractions ; soil organic matter ; mineralogy ; organomineral complexes ; carbon sequestration
%M ISI:000243842700023
%N 3-4
%P 477-489
%R 10.1016/j.geoderma.2006.10.006
%U https://www.documentation.ird.fr/hor/fdi:010037811
%> https://www.documentation.ird.fr/intranet/publi/2007/03/010037811.pdf
%V 137
%W Horizon (IRD)
%X 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.
%$ 068