%0 Journal Article %1 Metcalfe2010Impacts %A Metcalfe, Daniel B. %A Lobo-do Vale, Raquel %A Chaves, Manuela M. %A Maroco, Joao P. %A ao, Arag\ %A Malhi, Yadvinder %A Da Costa, Antonio L. %A Braga, Alan P. %A Goncalves, Paulo L. %A De Athaydes, Joao %A Da Costa, Mauricio %A Almeida, Samuel S. %A Campbell, Catherine %A Hurry, Vaughan %A Williams, Mathew %A Meir, Patrick %D 2010 %I Blackwell Publishing Ltd %J Functional Ecology %K brazil %N 3 %P 524--533 %R 10.1111/j.1365-2435.2009.01683.x %T Impacts of experimentally imposed drought on leaf respiration and morphology in an Amazon rain forest %U http://dx.doi.org/10.1111/j.1365-2435.2009.01683.x %V 24 %X 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 Caxiuanã 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.

@article{Metcalfe2010Impacts, abstract = {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 Caxiuan\~{a} 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.}, added-at = {2019-08-14T18:35:35.000+0200}, author = {Metcalfe, Daniel B. and Lobo-do Vale, Raquel and Chaves, Manuela M. and Maroco, Joao P. and {a}o, Arag\ and Malhi, Yadvinder and Da Costa, Antonio L. and Braga, Alan P. and Gon\c{c}alves, 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}, biburl = {https://www.bibsonomy.org/bibtex/20f00690b743496ced7028a31b95a9417/karinawilliams}, citeulike-article-id = {7067852}, citeulike-linkout-0 = {http://dx.doi.org/10.1111/j.1365-2435.2009.01683.x}, citeulike-linkout-1 = {http://www.ingentaconnect.com/content/bsc/fecol/2010/00000024/00000003/art00005}, day = 1, doi = {10.1111/j.1365-2435.2009.01683.x}, interhash = {cf9fc24fdd0a63ac0cde17fe1bc89cbc}, intrahash = {0f00690b743496ced7028a31b95a9417}, issn = {0269-8463}, journal = {Functional Ecology}, keywords = {brazil}, month = jun, number = 3, pages = {524--533}, posted-at = {2017-09-13 10:12:10}, priority = {2}, publisher = {Blackwell Publishing Ltd}, timestamp = {2019-08-14T18:35:35.000+0200}, 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 }