Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4643939
- author
- publishing date
- 2010
- type
- Contribution to journal
- 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
- 2016-04-01 10:07:01
- date last changed
- 2022-01-25 19:57:13
@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}},
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}},
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}},
doi = {{10.1111/j.1365-2435.2009.01683.x}},
volume = {{24}},
year = {{2010}},
}