Indicator of potential residual carbon in soils after exogenous organic matter application

Lashermes Gwenaëlle, Nicolardot Bernard, Parnaudeau Virginie, Thuriès Laurent, Chaussod Rémi, Guillotin Marie-Laure, Lineres Monique, Mary Bruno, Metzger Laure, Morvan Thierry, Tricaud Antoine, Villette Christine, Houot Sabine. 2009. Indicator of potential residual carbon in soils after exogenous organic matter application. European Journal of Soil Science, 60 : 297-310.

Quartile : Q2, Sujet : SOIL SCIENCE

Résumé : An indicator to evaluate the proportion of exogenous organic matter (EOM) remaining in soils over the long-term after application has been developed. A database was constructed with analytical data corresponding to 83 EOMs, including sludges, composts, animal wastes, mulches, plant materials and fertilizers. The data included results of proximal analysis (soluble, SOL, hemicellulose-, HEM, cellulose-, CEL, and lignin-like, LIC, fractions, in g kg-1 total organic matter) and of carbon (C) mineralization during long-term incubations under laboratory conditions (in g kg-1 exogenous organic C, EOC). The potential residual organic C after EOM application to soil was assessed from the extrapolation of the incubation results. Then, partial least square regression was used to relate EOM characteristics to the proportion of potentially residual organic C previously determined from the incubations. The biochemical fractions of EOM were not predictive enough to develop the indicator. The proportion of organic C mineralized during 3 days of incubation (C3d) was cumulated and appeared to be the most predictive variable of residual organic C. The proposed indicator of residual organic carbon in soils (expressed as g EOC kg-1) was IROC = 445 + 0.5 SOL - 0.2 CEL + 0.7 LIC - 2.3 C3d. The indicator was calculated for the main types of EOM applied to soils. When compared with the few field data of residual C measured in long-term field experiments, the values provided by the indicator seemed to be over-estimated (i.e. EOC degradation could be faster under field conditions than during laboratory incubations).

Mots-clés Agrovoc : carbone, matière organique du sol

Classification Agris : P33 - Chimie et physique du sol
U10 - Informatique, mathématiques et statistiques
F04 - Fertilisation

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

Auteurs et affiliations

• Lashermes Gwenaëlle, INRA (FRA)
• Nicolardot Bernard, INRA (FRA)
• Parnaudeau Virginie, INRA (FRA)
• Thuriès Laurent, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-1365-7891
• Chaussod Rémi, INRA (FRA)
• Guillotin Marie-Laure, LCA (FRA)
• Lineres Monique, INRA (FRA)
• Mary Bruno, INRA (FRA)
• Metzger Laure, RITTMO (FRA)
• Morvan Thierry, INRA (FRA)
• Tricaud Antoine
• Villette Christine, LDAR (Aisne) (FRA)
• Houot Sabine, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/548551/)

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