Woignier T., Clostre F., Fernandes P., Rangon Luc, Soler A., Lesueur-Jannoyer M. (2016). Compost addition reduces porosity and chlordecone transfer in soil microstructure. In :
Devault D.A. (ed.), Macarie Hervé (ed.), Lemoine S. (ed.). Crop protection and environmental health : legacy management and new concepts. Environmental Science and Pollution Research, 23 (1), p. 98-108. Colloque Annuel du Groupement Français des Pesticides (GFP), 44., Fort-de-France (MTQ), 2014/05/26-29. ISSN 0944-1344.
Titre du document
Compost addition reduces porosity and chlordecone transfer in soil microstructure
Année de publication
2016
Auteurs
Woignier T., Clostre F., Fernandes P., Rangon Luc, Soler A., Lesueur-Jannoyer M.
In
Devault D.A. (ed.), Macarie Hervé (ed.), Lemoine S. (ed.), Crop protection and environmental health : legacy management and new concepts
Source
Environmental Science and Pollution Research, 2016,
23 (1), p. 98-108 ISSN 0944-1344
Colloque
Colloque Annuel du Groupement Français des Pesticides (GFP), 44., Fort-de-France (MTQ), 2014/05/26-29
Chlordecone, an organochlorine insecticide, pollutes soils and contaminates crops and water resources and is biomagnified by food chains. As chlordecone is partly trapped in the soil, one possible alternative to decontamination may be to increase its containment in the soil, thereby reducing its diffusion into the environment. Containing the pesticide in the soil could be achieved by adding compost because the pollutant has an affinity for organic matter. We hypothesized that adding compost would also change soil porosity, as well as transport and containment of the pesticide. We measured the pore features and studied the nanoscale structure to assess the effect of adding compost on soil microstructure. We simulated changes in the transport properties (hydraulic conductivity and diffusion) associated with changes in porosity. During compost incubation, the clay microstructure collapsed due to capillary stresses. Simulated data showed that the hydraulic conductivity and diffusion coefficient were reduced by 95 and 70 % in the clay microstructure, respectively. Reduced transport properties affected pesticide mobility and thus helped reduce its transfer from the soil to water and to the crop. We propose that the containment effect is due not only to the high affinity of chlordecone for soil organic matter but also to a trapping mechanism in the soil porosity.
Plan de classement
Pollution [038]
;
Pédologie [068]
;
Sciences du monde végétal [076]
Description Géographique
MARTINIQUE
Localisation
Fonds IRD [F B010066127]
Identifiant IRD
fdi:010066127
