Fruit development, not GPP, drives seasonal variation in NPP in a tropical palm plantation

Navarro Muriel, Jourdan Christophe, Sileye Tiata, Braconnier Serge, Mialet-Serra Isabelle, Saint André Laurent, Dauzat Jean, Nouvellon Yann, Epron Daniel, Bonnefond Jean-Marc, Berbigier Paul, Rouzière André, Bouillet Jean-Pierre, Roupsard Olivier. 2008. Fruit development, not GPP, drives seasonal variation in NPP in a tropical palm plantation. Tree Physiology, 28 (11) : 1661-1674.

Résumé : We monitored seasonal variations in net primary production (NPP), estimated by allometric equations from organ dimensions, gross primary production (GPP), estimated by the eddy covariance method, autotrophic respiration (Ra), estimated by a model, and fruit production in a coconut (Cocos nucifera L.) plantation located in the sub-tropical South Pacific archipelago of Vanuatu. Net primary production of the vegeta-tive compartments of the trees accumulated steadily through-out the year. Fruits accounted for 46% of tree NPP and showed large seasonal variations. On an annual basis, the sum of estimated NPP (16.1 Mg C ha-1 year-1) and Ra (24.0 Mg C ha-1 year-1) for the ecosystem (coconut trees and herbaceous understory) closely matched GPP (39.0 Mg C ha-1 year-1), suggesting adequate cross-validation of annual C budget methods. However, seasonal variations in NPP + Ra were smaller than the seasonal variations in GPP, and maximum tree NPP occurred 6 months after the midsummer peak in GPP and solar radiation. We propose that this discrepancy reflects seasonal variation in the allocation of dry mass to carbon reserves and new plant tissue, thus affecting the allometric relationships used for estimating NPP.

Mots-clés Agrovoc : Cocos nucifera, rendement des cultures, variation saisonnière, carbone, écosystème, cycle du carbone, développement biologique, fruit (botanique), photosynthèse

Mots-clés géographiques Agrovoc : Vanuatu

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F01 - Culture des plantes
F40 - Écologie végétale

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

Auteurs et affiliations

• Navarro Muriel, VARTC (VUT)
• Jourdan Christophe, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA) ORCID: 0000-0001-9857-3269
• Sileye Tiata, VARTC (VUT)
• Braconnier Serge, CIRAD-BIOS-UPR Modélisation intégrative (FRA)
• Mialet-Serra Isabelle, CIRAD-BIOS-UPR Modélisation intégrative (FRA)
• Saint André Laurent, CIRAD-PERSYST-UPR Ecosystèmes de plantations (FRA)
• Dauzat Jean, CIRAD-BIOS-UMR AMAP (FRA)
• Nouvellon Yann, CIRAD-PERSYST-UPR Ecosystèmes de plantations (BRA)
• Epron Daniel, INRA (FRA)
• Bonnefond Jean-Marc, INRA (FRA)
• Berbigier Paul, INRA (FRA)
• Rouzière André, CIRAD-PERSYST-DIR (FRA)
• Bouillet Jean-Pierre, CIRAD-PERSYST-UPR Ecosystèmes de plantations (BRA)
• Roupsard Olivier, CIRAD-PERSYST-UPR Ecosystèmes de plantations (CRI) ORCID: 0000-0002-1319-142X

Source : Cirad - Agritrop (https://agritrop.cirad.fr/546347/)

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