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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Asynchronism in leaf and wood production in tropical forests: A study combining satellite and ground-based measurements
Biogeosciences, Volume 10, No. 11, Year 2013
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Description
The fixation of carbon in tropical forests mainly occurs through the production of wood and leaves, both being the principal components of net primary production. Currently field and satellite observations are independently used to describe the forest carbon cycle, but the link between satellite-derived forest phenology and field-derived forest productivity remains opaque. We used a unique combination of a MODIS enhanced vegetation index (EVI) dataset, a wood production model based on climate data and direct litterfall observations at an intra-annual timescale in order to question the synchronism of leaf and wood production in tropical forests. Even though leaf and wood biomass fluxes had the same range (respectively 2.4 ± 1.4 and 2.2 ± 0.4 Mg C ha-1 yr-1), they occurred separately in time. EVI increased with leaf renewal at the beginning of the dry season, when solar irradiance was at its maximum. At this time, wood production stopped. At the onset of the rainy season, when new leaves were fully mature and water available again, wood production quickly increased to reach its maximum in less than a month, reflecting a change in carbon allocation from short-lived pools (leaves) to long-lived pools (wood). The time lag between peaks of EVI and wood production (109 days) revealed a substantial decoupling between the leaf renewal assumed to be driven by irradiance and the water-driven wood production. Our work is a first attempt to link EVI data, wood production and leaf phenology at a seasonal timescale in a tropical evergreen rainforest and pave the way to develop more sophisticated global carbon cycle models in tropical forests. © 2013 Author(s).
Authors & Co-Authors
Wagner, Fabien H.
France, Paris
Cirad
Brazil, Sao Jose Dos Campos
Instituto Nacional de Pesquisas Espaciais
Rossi, Vivien
France, Montpellier
Forêts et Sociétés
Cameroon, Yaounde
Université de Yaoundé I
Stahl, Clément
France, Paris
Cirad
France, Montpellier
Systèmes D'elevage Méditerranéens et Tropicaux Selmet
Bonal, Damien
France, Champenoux
Centre de Recherche Grand Est-nancy
Herault, Bruno
France, Paris
Cirad
Statistics
Citations: 44
Authors: 5
Affiliations: 6
Identifiers
Doi:
10.5194/bg-10-7307-2013
e-ISSN:
17264189
Research Areas
Environmental