Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1716
Título: Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon
Autor: Metcalfe, Daniel B.
Meir, Patrick
Aragão, Luiz E. O. C.
Lobo-do-Vale, Raquel
Galbraith, David
Fisher, Rosie
Chaves, Maria Manuela
Maroco, João
Costa, António L. da
Almeida, Samuel S.
Braga, Alan P.
Gonçalves, Paulo L.
Athaydes, João de
Costa, Mauricio da
Portela, T. T. B.
Oliveira, A. A. R. de
Malhi, Yadvinder
Williams, Mathew
Palavras-chave: Amazon rain forest
Carbon cycling
Carbon dioxide
Carbon use efficiency
Drought
Gross primary productivity
Net primary productivity
Partitioning
Data: 2010
Editora: Wiley-Blackwell
Citação: New Phytologist, 187, 608-621
Resumo: The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot. • Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature. • Total ecosystem respiration (Reco) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (Rauto)), were elevated on the TFE plot relative to the control. The increase in PCE and Reco was mainly caused by a rise in Rauto from foliage and roots. Heterotrophic respiration did not differ substantially between plots. NPP was 2.4 ± 1.4 t C ha)1 yr)1 lower on the TFE than the control. Ecosystem carbon use efficiency, the proportion of PCE invested in NPP, was lower in the TFE plot (0.24 ± 0.04) than in the control (0.32 ± 0.04). • Drought caused by the TFE treatment appeared to drive fundamental shifts in ecosystem C cycling with potentially important consequences for long-term forest C storage.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1716
ISSN: 0028-646X
Aparece nas colecções:BIOL - Artigos em revistas internacionais

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