Utilize este identificador para referenciar este registo:
|Título:||Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon|
|Autor:||Metcalfe, Daniel B.|
Aragão, Luiz E. O. C.
Chaves, Maria Manuela
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
|Palavras-chave:||Amazon rain forest|
Carbon use efficiency
Gross primary productivity
Net primary productivity
|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.|
|Aparece nas colecções:||BIOL - Artigos em revistas internacionais|
Ficheiros deste registo:
|NP 187 608–621.pdf||565,18 kB||Adobe PDF||Ver/Abrir|
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.