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Source and sink carbon dynamics and carbon allocation in the Amazon basin

Doughty, Christopher E.; Metcalfe, Dan LU ; Girardin, C. A. J.; Amezquita, F. F.; Durand, L.; Huasco, W. Huaraca; Silva-Espejo, J. E.; Araujo-Murakami, A.; da Costa, M. C. and da Costa, A. C. L., et al. (2015) In Global Biogeochemical Cycles 29(5). p.645-655
Abstract
Changes to the carbon cycle in tropical forests could affect global climate, but predicting such changes has been previously limited by lack of field-based data. Here we show seasonal cycles of the complete carbon cycle for 14, 1ha intensive carbon cycling plots which we separate into three regions: humid lowland, highlands, and dry lowlands. Our data highlight three trends: (1) there is differing seasonality of total net primary productivity (NPP) with the highlands and dry lowlands peaking in the dry season and the humid lowland sites peaking in the wet season, (2) seasonal reductions in wood NPP are not driven by reductions in total NPP but by carbon during the dry season being preferentially allocated toward either roots or canopy NPP,... (More)
Changes to the carbon cycle in tropical forests could affect global climate, but predicting such changes has been previously limited by lack of field-based data. Here we show seasonal cycles of the complete carbon cycle for 14, 1ha intensive carbon cycling plots which we separate into three regions: humid lowland, highlands, and dry lowlands. Our data highlight three trends: (1) there is differing seasonality of total net primary productivity (NPP) with the highlands and dry lowlands peaking in the dry season and the humid lowland sites peaking in the wet season, (2) seasonal reductions in wood NPP are not driven by reductions in total NPP but by carbon during the dry season being preferentially allocated toward either roots or canopy NPP, and (3) there is a temporal decoupling between total photosynthesis and total carbon usage (plant carbon expenditure). This decoupling indicates the presence of nonstructural carbohydrates which may allow growth and carbon to be allocated when it is most ecologically beneficial rather than when it is most environmentally available. (Less)
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Contribution to journal
publication status
published
subject
keywords
GPP, PCE, autotrophic respiration, NPP, tropical forests
in
Global Biogeochemical Cycles
volume
29
issue
5
pages
645 - 655
publisher
American Geophysical Union
external identifiers
  • wos:000356383700009
  • scopus:85027925731
ISSN
0886-6236
DOI
10.1002/2014GB005028
language
English
LU publication?
yes
id
c4e3122c-35fd-42c0-bbb6-9cf3c1015cb4 (old id 7601807)
date added to LUP
2015-07-23 14:32:47
date last changed
2017-11-12 03:49:12
@article{c4e3122c-35fd-42c0-bbb6-9cf3c1015cb4,
  abstract     = {Changes to the carbon cycle in tropical forests could affect global climate, but predicting such changes has been previously limited by lack of field-based data. Here we show seasonal cycles of the complete carbon cycle for 14, 1ha intensive carbon cycling plots which we separate into three regions: humid lowland, highlands, and dry lowlands. Our data highlight three trends: (1) there is differing seasonality of total net primary productivity (NPP) with the highlands and dry lowlands peaking in the dry season and the humid lowland sites peaking in the wet season, (2) seasonal reductions in wood NPP are not driven by reductions in total NPP but by carbon during the dry season being preferentially allocated toward either roots or canopy NPP, and (3) there is a temporal decoupling between total photosynthesis and total carbon usage (plant carbon expenditure). This decoupling indicates the presence of nonstructural carbohydrates which may allow growth and carbon to be allocated when it is most ecologically beneficial rather than when it is most environmentally available.},
  author       = {Doughty, Christopher E. and Metcalfe, Dan and Girardin, C. A. J. and Amezquita, F. F. and Durand, L. and Huasco, W. Huaraca and Silva-Espejo, J. E. and Araujo-Murakami, A. and da Costa, M. C. and da Costa, A. C. L. and Rocha, W. and Meir, P. and Galbraith, D. and Malhi, Y.},
  issn         = {0886-6236},
  keyword      = {GPP,PCE,autotrophic respiration,NPP,tropical forests},
  language     = {eng},
  number       = {5},
  pages        = {645--655},
  publisher    = {American Geophysical Union},
  series       = {Global Biogeochemical Cycles},
  title        = {Source and sink carbon dynamics and carbon allocation in the Amazon basin},
  url          = {http://dx.doi.org/10.1002/2014GB005028},
  volume       = {29},
  year         = {2015},
}