Geochemical resilience of a ferralsol subjected to anoxia and organic matter amendment

Lahlah Jasmina, Renault Pierre, Cazevieille Patrick, Buzet Aurélie, Hazemann Jean-Louis, Womes Manfred, Cambier Philippe. 2009. Geochemical resilience of a ferralsol subjected to anoxia and organic matter amendment. Soil Science Society of America Journal, 73 (6) : 1958-1971.

Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : Th e spreading of vinasse on soils may favor not only anoxia but also mineral alterations and metal mobilization. Our aims were to record the geochemical changes occurring in a ferralsol subjected to vinasse input and anaerobiosis, and to check for soil resilience aft er a return to aerobic conditions. Soil slurries were therefore incubated under successive 7 d of aerobic, 0 to 28 d of anaerobic, and 28 d of aerobic conditions, vinasse being supplied at one of three levels when anaerobiosis began. At several dates, the slurry solution was characterized (pH and organic and mineral compounds) and Mn and Fe oxidation states in solids were assessed. Before incubations, about 20% of the Fe in solids was already reduced, whereas almost all Mn was found as Mn(IV). During the fi rst aerobic period, mobilized metals included Pb, Zn, Ni, Cu, and Cr. Aft er vinasse input during the fi rst 14 d of anaerobiosis, the principal biotransformations were fermentation and true acetogenesis; Fe and Mn were mobilized during this period (up to 4.05 and 6.2 mmol L-1, respectively), and most Mn and an unknown but small fraction of Fe in solids were reduced. During the subsequent 14 d of anaerobiosis, only acetoclastic methanogenesis was observed. Th e return to aerobic conditions led to rapid oxidative immobilization of Fe, desorption of exchangeable Fe(II), and the partial immobilization of other metals (Ca, Mg, K, Na, Mn, Pb, and Ni). Manganese was not oxidized, and there was no return to the initial conditions for Fe and Mn in solids.

Mots-clés Agrovoc : ferralsol, vinasse, aérobiose, composition chimique, métal lourd, amendement organique

Classification Agris : F04 - Fertilisation
P33 - Chimie et physique du sol
Q70 - Traitement des déchets agricoles

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Lahlah Jasmina, INRA (FRA)
• Renault Pierre, INRA (FRA)
• Cazevieille Patrick, CIRAD-PERSYST-UPR Recyclage et risque (FRA)
• Buzet Aurélie, INRA (FRA)
• Hazemann Jean-Louis, CNRS (FRA)
• Womes Manfred, ICGM (FRA)
• Cambier Philippe, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/552136/)

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