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Simulating forest productivity along a neotropical elevational transect: temperature variation and carbon use efficiency

Marthews, Toby R.; Malhi, Yadvinder; Girardin, Cecile A. J.; Silva Espejo, Javier E.; Aragao, Luiz E. O. C.; Metcalfe, Dan LU ; Rapp, Joshua M.; Mercado, Lina M.; Fisher, Rosie A. and Galbraith, David R., et al. (2012) In Global Change Biology 18(9). p.2882-2898
Abstract
A better understanding of the mechanisms controlling the magnitude and sign of carbon components in tropical forest ecosystems is important for reliable estimation of this important regional component of the global carbon cycle. We used the JULES vegetation model to simulate all components of the carbon balance at six sites along an Andes-Amazon transect across Peru and Brazil and compared the results to published field measurements. In the upper montane zone the model predicted a lack of forest vegetation, indicating a need for better parameterization of the responses of cloud forest vegetation within the model. In the lower montane and lowland zones simulated ecosystem productivity and respiration were predicted with reasonable accuracy,... (More)
A better understanding of the mechanisms controlling the magnitude and sign of carbon components in tropical forest ecosystems is important for reliable estimation of this important regional component of the global carbon cycle. We used the JULES vegetation model to simulate all components of the carbon balance at six sites along an Andes-Amazon transect across Peru and Brazil and compared the results to published field measurements. In the upper montane zone the model predicted a lack of forest vegetation, indicating a need for better parameterization of the responses of cloud forest vegetation within the model. In the lower montane and lowland zones simulated ecosystem productivity and respiration were predicted with reasonable accuracy, although not always within the error bounds of the observations. Model-predicted carbon use efficiency in this transect surprisingly did not increase with elevation, but remained close to the temperate value 0.5. Upper montane forests were predicted to allocate similar to 50% of carbon fixation to biomass maintenance and growth, despite available measurements showing that they only allocate similar to 33%. This may be explained by elevational changes in the balance between growth and maintenance respiration within the forest canopy, as controlled by both temperature- and pressure-mediated processes, which is not yet well represented in current vegetation models. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
tropical forest production, JULES model, field measurements, maintenance, respiration, Peru, Brazil
in
Global Change Biology
volume
18
issue
9
pages
2882 - 2898
publisher
Wiley-Blackwell
external identifiers
  • wos:000307222700019
  • scopus:84864586469
ISSN
1354-1013
DOI
10.1111/j.1365-2486.2012.02728.x
language
English
LU publication?
no
id
c075039b-bb4b-4896-ac49-cbe594e5c6f9 (old id 4643901)
date added to LUP
2014-09-26 07:50:46
date last changed
2017-11-05 03:09:13
@article{c075039b-bb4b-4896-ac49-cbe594e5c6f9,
  abstract     = {A better understanding of the mechanisms controlling the magnitude and sign of carbon components in tropical forest ecosystems is important for reliable estimation of this important regional component of the global carbon cycle. We used the JULES vegetation model to simulate all components of the carbon balance at six sites along an Andes-Amazon transect across Peru and Brazil and compared the results to published field measurements. In the upper montane zone the model predicted a lack of forest vegetation, indicating a need for better parameterization of the responses of cloud forest vegetation within the model. In the lower montane and lowland zones simulated ecosystem productivity and respiration were predicted with reasonable accuracy, although not always within the error bounds of the observations. Model-predicted carbon use efficiency in this transect surprisingly did not increase with elevation, but remained close to the temperate value 0.5. Upper montane forests were predicted to allocate similar to 50% of carbon fixation to biomass maintenance and growth, despite available measurements showing that they only allocate similar to 33%. This may be explained by elevational changes in the balance between growth and maintenance respiration within the forest canopy, as controlled by both temperature- and pressure-mediated processes, which is not yet well represented in current vegetation models.},
  author       = {Marthews, Toby R. and Malhi, Yadvinder and Girardin, Cecile A. J. and Silva Espejo, Javier E. and Aragao, Luiz E. O. C. and Metcalfe, Dan and Rapp, Joshua M. and Mercado, Lina M. and Fisher, Rosie A. and Galbraith, David R. and Fisher, Joshua B. and Salinas-Revilla, Norma and Friend, Andrew D. and Restrepo-Coupe, Natalia and Williams, Richard J.},
  issn         = {1354-1013},
  keyword      = {tropical forest production,JULES model,field measurements,maintenance,respiration,Peru,Brazil},
  language     = {eng},
  number       = {9},
  pages        = {2882--2898},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Simulating forest productivity along a neotropical elevational transect: temperature variation and carbon use efficiency},
  url          = {http://dx.doi.org/10.1111/j.1365-2486.2012.02728.x},
  volume       = {18},
  year         = {2012},
}