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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.

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Repositório do ISPA Instituto Superior de Psicologia Aplicada  

Autor(es)

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 - 

Id.: 55782615

Idioma: eng  - 

Versión: 1.0

Estado: Final

Palabras claveAmazon rain forest - 

Tipo de recurso: article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: restrictedAccess

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 24-sep-2012

Contacto:

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