Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Asynchronism in leaf and wood production in tropical forests: a study combining satellite and ground-based measurements

Texto completo
Autor(es):
Wagner, F. [1, 2] ; Rossi, V. [3, 4] ; Stahl, C. [1, 5] ; Bonal, D. [6] ; Herault, B. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] CIRAD, UMR Ecol Forets Guyane, Kourou - French Guiana
[2] Natl Inst Space Res INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[3] Cirad, Biens & Serv Ecosyst Forestiers Trop UR105, Montpellier - France
[4] Univ Yaounde, Modelisat Math & Informat Syst Complexes UMI209, Yaounde - Cameroon
[5] CIRAD, UMR Syst Elevage Milieux Mediterraneens & Trop, Kourou - French Guiana
[6] INRA, UMR EEF 1137, F-54280 Champenoux - France
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: BIOGEOSCIENCES; v. 10, n. 11, p. 7307-7321, 2013.
Citações Web of Science: 16
Resumo

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. (AU)

Processo FAPESP: 13/14520-6 - Quantificação e modelagem da sazonalidade da produção primária líquida florestal pantropical usando observações de campo e dados de sensoriamento remoto
Beneficiário:Fabien Hubert Wagner
Linha de fomento: Bolsas no Brasil - Pós-Doutorado