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Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils

Razafimbelo-Andriamifidy Tantely, Chevallier Tiphaine, Albrecht Alain, Chapuis-Lardy Lydie, Rakotondrasolo Fela Nirina, Michellon Roger, Rabeharisoa R. Lilia, Bernoux Martial. 2013. Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils. Scientia Agrícola, 70 (3) : pp. 204-208.

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Quartile : Q2, Sujet : AGRICULTURE, MULTIDISCIPLINARY

Abstract : Soil organic carbon (SOC) is usually said to be well correlated with soil texture and soil aggregation. These relations generally suggest a physical and physicochemical protection of SOC within soil aggregates and on soil fi ne particles, respectively. Because there are few experimental evidences of these relations on tropical soils, we tested the relations of soil variables (SOC and soil aggregate contents, and soil texture) with the amount of SOC physically protected in aggregates on a set of 15 Malagasy soils. The soil texture, the SOC and water stable macroaggregate (MA) contents and the amount of SOC physically protected inside aggregates, calculated as the difference of C mineralized by crushed and intact aggregates, were characterized. The relation between these variables was established. SOC content was signifi cantly correlated with soil texture (clay+fi ne silt fraction) and with soil MA amount while protected SOC content was not correlated with soil MA amount. This lack of correlation might be attributed to the highest importance of physicochemical protection of SOC which is demonstrated by the positive relation between SOC and clay+fi ne silt fraction. (Résumé d'auteur)

Mots-clés Agrovoc : Sol tropical, Matière organique du sol, Conservation des sols, Texture du sol, Stockage, Carbone, Propriété physicochimique du sol, Unité structurale du sol

Mots-clés géographiques Agrovoc : Madagascar

Classification Agris : P36 - Soil erosion, conservation and reclamation
P33 - Soil chemistry and physics

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

  • Razafimbelo-Andriamifidy Tantely, LRI (MDG)
  • Chevallier Tiphaine, IRD (FRA)
  • Albrecht Alain, IRD (MDG)
  • Chapuis-Lardy Lydie, CIRAD-PERSYST-UMR Eco&Sols (SEN)
  • Rakotondrasolo Fela Nirina, Université de Madagascar (MDG)
  • Michellon Roger, CIRAD-PERSYST-UPR SIA (MDG)
  • Rabeharisoa R. Lilia, Université d'Antananarivo (MDG)
  • Bernoux Martial, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/570593/)

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