Agritrop
Home

Transpiration alters the contribution of autotrophic and heterotrophic components of soil CO2 efflux

Grossiord Charlotte, Mareschal Louis, Epron Daniel. 2012. Transpiration alters the contribution of autotrophic and heterotrophic components of soil CO2 efflux. New Phytologist, 194 (3) : pp. 647-653.

Journal article ; Article de revue à facteur d'impact
[img] Published version - Anglais
Access restricted to CIRAD agents
Use under authorization by the author or CIRAD.
document_564292.pdf

Télécharger (469kB)

Quartile : Outlier, Sujet : PLANT SCIENCES

Abstract : An unbiased partitioning of autotrophic and heterotrophic components of soil CO2 efflux is important to estimate forest carbon budgets and soil carbon sequestration. The contribution of autotrophic sources to soil CO2 efflux (FA) may be underestimated during the daytime as a result of internal transport of CO2 produced by root respiration through the transpiration stream. Here, we tested the hypothesis that carbon isotope composition of soil CO2 efflux (dFS) in a Eucalyptus plantation grown on a C4 soil is enriched during the daytime, which will indicate a decrease in FA during the periods of high transpiration. Mean dFS of soil CO2 efflux decreased to )25.7& during the night and increased to )24.7&between 11:00 and 15:00 h when the xylem sap flux density was at its maximum. Our results indicate a decrease in the contribution of root respiration to soil CO2 efflux during the day that may be interpreted as a departure of root-produced CO2 in the transpiration stream, leading to a 17% underestimation of autotrophic contribution to soil CO2 efflux on a daily timescale. (Résumé d'auteur)

Mots-clés Agrovoc : Carbone, Eucalyptus, Composition chimique, Respiration du sol, production, Matière organique du sol, Dioxyde de carbone, Plante en c4, isotope, Racine, Transpiration, Photosynthèse, Forêt, forêt tropicale, Analyse de sol, séquestration du carbone

Mots-clés géographiques Agrovoc : Congo

Classification Agris : F62 - Plant physiology - Growth and development
P33 - Soil chemistry and physics

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

Auteurs et affiliations

  • Grossiord Charlotte, INRA (FRA)
  • Mareschal Louis, CIRAD-PERSYST-UMR Eco&Sols (COG)
  • Epron Daniel, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/564292/)

View Item (staff only) View Item (staff only)

[ Page générée et mise en cache le 2021-03-04 ]