Publications des scientifiques de l'IRD

Woignier Thierry, Duffours L., Colombel P., Dieudonné P. (2015). Nanoporous clay with carbon sink and pesticide trapping properties. European Physical Journal. Special Topics, 224 (9), p. 1945-1962. ISSN 1951-6355.

Titre du document
Nanoporous clay with carbon sink and pesticide trapping properties
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000358267500026
Auteurs
Woignier Thierry, Duffours L., Colombel P., Dieudonné P.
Source
European Physical Journal. Special Topics, 2015, 224 (9), p. 1945-1962 ISSN 1951-6355
A thorough understanding of the mechanisms and factors involved in the dynamics of organic carbon in soils is required to identify and enhance natural sinks for greenhouse gases. Some tropical soils, such as Andosols, have 3-6 fold higher concentrations of organic carbon than other kinds of soils containing classical clays. In the tropics, toxic pesticides permanently pollute soils and contaminate crops, water resources, and ecosystems. However, not all soils are equal in terms of pesticide contamination or in their ability to transfer pollution to the ecosystem. Andosols are generally more polluted than the other kinds of soils but, surprisingly, they retain and trap more pesticides, thereby reducing the transfer of pesticides to ecosystems, water resources, and crops. Andosols thus have interesting environmental properties in terms of soil carbon sequestration and pesticide retention. Andosols contain a nano porous clay (allophane) with unique structures and physical properties compared to more common clays; these are large pore volume, specific surface area, and a tortuous and fractal porous arrangement. The purpose of this mini review is to discuss the importance of the allophane fractal microstructure for carbon sequestration and pesticide trapping in the soil. We suggest that the tortuous microstructure (which resembles a labyrinths) of allophane aggregates and the associated low accessibility partly explain the poor availability of soil organic matter and of any pesticides trapped in andosols.
Plan de classement
Sciences du milieu [021] ; Pédologie [068]
Description Géographique
MONDE
Localisation
Fonds IRD [F B010064837]
Identifiant IRD
fdi:010064837
Contact