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Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon

Metcalfe, Dan LU ; Meir, P.; Aragao, L. E. O. C.; Lobo-do-Vale, R.; Galbraith, D.; Fisher, R. A.; Chaves, M. M.; Maroco, J. P.; da Costa, A. C. L. and de Almeida, S. S., et al. (2010) In New Phytologist 187(3). p.608-621
Abstract
P>The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot. Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature. Total ecosystem respiration (R-eco) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (R-auto)), were elevated on the TFE plot relative to the control. The increase in PCE and R-eco was mainly... (More)
P>The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot. Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature. Total ecosystem respiration (R-eco) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (R-auto)), were elevated on the TFE plot relative to the control. The increase in PCE and R-eco was mainly caused by a rise in R-auto from foliage and roots. Heterotrophic respiration did not differ substantially between plots. NPP was 2.4 +/- 1.4 t C ha-1 yr-1 lower on the TFE than the control. Ecosystem carbon use efficiency, the proportion of PCE invested in NPP, was lower in the TFE plot (0.24 +/- 0.04) than in the control (0.32 +/- 0.04). Drought caused by the TFE treatment appeared to drive fundamental shifts in ecosystem C cycling with potentially important consequences for long-term forest C storage. (Less)
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published
subject
keywords
Amazon rain forest, carbon cycling, carbon dioxide, carbon use, efficiency, drought, gross primary productivity, net primary, productivity, partitioning
in
New Phytologist
volume
187
issue
3
pages
608 - 621
publisher
Wiley-Blackwell
external identifiers
  • wos:000280122500009
  • scopus:77955165643
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2010.03319.x
language
English
LU publication?
no
id
47cd3657-5c94-435e-8592-cfa68785a978 (old id 4643986)
date added to LUP
2014-09-26 07:43:23
date last changed
2018-07-15 03:15:47
@article{47cd3657-5c94-435e-8592-cfa68785a978,
  abstract     = {P>The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot. Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature. Total ecosystem respiration (R-eco) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (R-auto)), were elevated on the TFE plot relative to the control. The increase in PCE and R-eco was mainly caused by a rise in R-auto from foliage and roots. Heterotrophic respiration did not differ substantially between plots. NPP was 2.4 +/- 1.4 t C ha-1 yr-1 lower on the TFE than the control. Ecosystem carbon use efficiency, the proportion of PCE invested in NPP, was lower in the TFE plot (0.24 +/- 0.04) than in the control (0.32 +/- 0.04). Drought caused by the TFE treatment appeared to drive fundamental shifts in ecosystem C cycling with potentially important consequences for long-term forest C storage.},
  author       = {Metcalfe, Dan and Meir, P. and Aragao, L. E. O. C. and Lobo-do-Vale, R. and Galbraith, D. and Fisher, R. A. and Chaves, M. M. and Maroco, J. P. and da Costa, A. C. L. and de Almeida, S. S. and Braga, A. P. and Goncalves, P. H. L. and de Athaydes, J. and da Costa, M. and Portela, T. T. B. and de Oliveira, A. A. R. and Malhi, Y. and Williams, M.},
  issn         = {1469-8137},
  keyword      = {Amazon rain forest,carbon cycling,carbon dioxide,carbon use,efficiency,drought,gross primary productivity,net primary,productivity,partitioning},
  language     = {eng},
  number       = {3},
  pages        = {608--621},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2010.03319.x},
  volume       = {187},
  year         = {2010},
}