Fruit development, not GPP, drives seasonal variation in NPP in a tropical palm plantation
Navarro Maxime, Jourdan C., Sileye T., Braconnier Serge, Mialet-Serra I., Saint-André Laurent, Dauzat Jean, Nouvellon Y., Epron Daniel , Bonnefond Jean-Marc , Berbigier Paul, Rouzière A., Bouillet J.-P., Roupsard O.. 2008. .
ARTICLE, (2008 ) - PUBLISHEDVERSION - English (en-GB)
OPENACCESS -
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Audience : OTHER
HAL CCSD, Oxford University Press (OUP): Policy B - Oxford Open Option B
Sujet
CARBON ALLOCATION,, ECOSYSTEM C BALANCE,, FINE ROOT TURNOVER,, YIELD, COCOS NUCIFERA,, [SDV]Life Sciences [q-bio], [SDE]Environmental Sciences
Domaines
Coco, Biologie, Sciences du vivant, Sciences de l'environnement, Environnement
Description
International audience 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 (R(a)), 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 vegetative compartments of the trees accumulated steadily throughout 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 R(a) (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 + R(a) 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.
Auteurs
Navarro, Maxime, Jourdan, C., Sileye, T., Braconnier, Serge, Mialet-Serra, I., Saint-André, Laurent, Dauzat, Jean, Nouvellon, Y., Epron, Daniel, , Bonnefond, Jean-Marc, , Berbigier, Paul, Rouzière, A., Bouillet, J.-P., Roupsard, O.
Contributeurs
Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Vanuatu Agricultural Research and Technical Centre ; Partenaires INRAE, Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL), Écologie fonctionnelle et physique de l'environnement (EPHYSE) ; Institut National de la Recherche Agronomique (INRA), Centro Agronomico Tropical de Investigacion y Enseñanza (CATIE)
Sources
ISSN: 0829-318X, EISSN: 1758-4469, Tree Physiology, Tree Physiology, Oxford University Press (OUP): Policy B - Oxford Open Option B, 2008, 28 (11), pp.1661-1674. ⟨10.1093/treephys/28.11.1661⟩
