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Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest

Metcalfe, Dan LU ; Lobo-do-Vale, Raquel; Chaves, Manuela M.; Maroco, Joao P.; Aragao, Luiz E. O. C.; Malhi, Yadvinder; Da Costa, Antonio L.; Braga, Alan P.; Goncalves, Paulo L. and De Athaydes, Joao, et al. (2010) In Functional Ecology 24(3). p.524-533
Abstract
P>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 degrees 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 degrees C was elevated in the TFR forest compared to the Control forest experiencing normal rainfall. After 5 years of the TFR treatment, R... (More)
P>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 degrees 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 degrees 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. (Less)
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publication status
published
subject
keywords
tropical forest, climate change, moisture deficit, leaf dark, respiration, night-time foliar carbon emissions, specific leaf area, leaf area index, through-fall exclusion experiment
in
Functional Ecology
volume
24
issue
3
pages
524 - 533
publisher
Wiley-Blackwell
external identifiers
  • wos:000276508000005
  • scopus:77955130828
ISSN
1365-2435
DOI
10.1111/j.1365-2435.2009.01683.x
language
English
LU publication?
no
id
5589b736-78de-4931-8a5e-cdf110423b2a (old id 4643939)
date added to LUP
2014-09-26 07:46:44
date last changed
2018-07-01 03:06:46
@article{5589b736-78de-4931-8a5e-cdf110423b2a,
  abstract     = {P>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 degrees 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 degrees 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.},
  author       = {Metcalfe, Dan and Lobo-do-Vale, Raquel and Chaves, Manuela M. and Maroco, Joao P. and Aragao, Luiz E. O. C. and Malhi, Yadvinder and Da Costa, Antonio L. and Braga, Alan P. and Goncalves, Paulo L. and De Athaydes, Joao and Da Costa, Mauricio and Almeida, Samuel S. and Campbell, Catherine and Hurry, Vaughan and Williams, Mathew and Meir, Patrick},
  issn         = {1365-2435},
  keyword      = {tropical forest,climate change,moisture deficit,leaf dark,respiration,night-time foliar carbon emissions,specific leaf area,leaf area index,through-fall exclusion experiment},
  language     = {eng},
  number       = {3},
  pages        = {524--533},
  publisher    = {Wiley-Blackwell},
  series       = {Functional Ecology},
  title        = {Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest},
  url          = {http://dx.doi.org/10.1111/j.1365-2435.2009.01683.x},
  volume       = {24},
  year         = {2010},
}