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Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest
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2010 (English)In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 24, no 3, 524-533 p.Article in journal (Refereed) Published
Abstract [en]

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.

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2010. Vol. 24, no 3, 524-533 p.
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URN: urn:nbn:se:umu:diva-37319DOI: 10.1111/j.1365-2435.2009.01683.xISI: 000276508000005OAI: diva2:359201
Available from: 2010-10-27 Created: 2010-10-27 Last updated: 2015-04-29Bibliographically approved

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Campbell, CatherineHurry, Vaughan
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Umeå Plant Science Centre (UPSC)Department of Plant Physiology
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