Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1710
Título: Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest
Autor: Metcalfe, Daniel B.
Lobo-do-Vale, Raquel
Chaves, Maria Manuela
Maroco, João
Aragão, Luiz E. O. C.
Malhi, Yadvinder
Costa, António L. da
Braga, Alan P.
Gonçalves, Paulo L.
Athaydes, João de
Costa, Mauricio da
Almeida, Samuel S.
Campbell, Catherine
Hurry, Vaughan
Williams, Mathew
Meir, Patrick
Palavras-chave: Tropical forest
Climate change
Moisture deficit
Leaf dark respiration
Night-time foliar carbon emissions
Specific leaf area
Leaf area index
Through-fall exclusion experiment
Data: 2010
Editora: Wiley-Blackwell
Citação: Functional Ecology, 24, 524-533
Resumo: 1. The Amazon region may experience increasing moisture limitation over this century. Leaf dark respiration (R) is a key component of the Amazon rain forest carbon (C) cycle, but relatively little is known about its sensitivity to drought. 2. Here, we present measurements of R standardized to 25 C and leaf morphology from different canopy heights over 5 years at a rain forest subject to a large-scale through-fall reduction (TFR) experiment, and nearby, unmodified Control forest, at the Caxiuana˜ reserve in the eastern Amazon. 3. In all five post-treatment measurement campaigns, mean R at 25 C was elevated in the TFR forest compared to the Control forest experiencing normal rainfall. After 5 years of the TFR treatment, R per unit leaf area and mass had increased by 65% and 42%, respectively, relative to pre-treatment means. In contrast, leaf area index (L) in the TFR forest was consistently lower than the Control, falling by 23% compared to the pre-treatment mean, largely because of a decline in specific leaf area (S). 4. The consistent and significant effects of the TFR treatment on R, L and S suggest that severe drought events in the Amazon, of the kind that may occur more frequently in future, could cause a substantial increase in canopy carbon dioxide emissions from this ecosystem to the atmosphere.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1710
ISSN: 0269-8463
Aparece nas colecções:BIOL - Artigos em revistas internacionais

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