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

Marthews, Toby R.; Malhi, Yadvinder; Girardin, Cécile A. J.; Silva Espejo, Javier E.; Aragão, Luiz E. O. C.; Metcalfe, Daniel B.; Rapp, Joshua M.; Mercado, Lina M.; Fisher, Rosie A.; Galbraith, David R.; Fisher, Joshua B.; Salinas-Revilla, Norma; Friend, Andrew D.; Restrepo-Coupe, Natalia; Williams, Richard J.. 2012 Simulating forest productivity along a neotropical elevational transect: temperature variation and carbon use efficiency. Global Change Biology, 18 (9). 2882-2898.

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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 ~50% of carbon fixation to biomass maintenance and growth, despite available measurements showing that they only allocate ~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

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry
UKCEH and CEH Sections/Science Areas: Reynard
ISSN: 1354-1013
Additional Information. Not used in RCUK Gateway to Research.: This document is the author’s final manuscript version of the journal article, incorporating any revisions agreed during the peer review process. Some differences between this and the publisher’s version remain. You are advised to consult the publisher’s version if you wish to cite from this article. The definitive version is available at
Additional Keywords: tropical forest production, JULES model, field measurements, maintenance respiration, Peru, Brazil
NORA Subject Terms: Ecology and Environment
Date made live: 21 Jan 2013 12:07 +0 (UTC)

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