Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-51
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Feb 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
Ecophysiological modeling of the climate imprint on photosynthesis and carbon allocation to the tree stem in the North American boreal forest
Fabio Gennaretti1, Guillermo Gea-Izquierdo2, Etienne Boucher3, Frank Berninger4, Dominique Arseneault5, and Joel Guiot1 1CEREGE, Aix-Marseille University, CNRS, IRD, Aix en Provence, 13545, France
2Departamento de Sistemas y Recursos Forestales, CIFOR-INIA, Madrid, 28040, Spain
3Département de géographie, Université du Québec à Montréal, Montréal, H3C3P8, Canada
4Department of Forest Sciences, University of Helsinki, Helsinki, 00014, Finland
5Département de biologie, chimie et géographie, Université du Québec à Rimouski, Rimouski, G5L3A1, Canada
Abstract. A better understanding of the coupling between photosynthesis and carbon allocation in the boreal forest, with implicated environmental factors and mechanistic rules, is crucial to accurately predict boreal forest carbon stocks and fluxes, which are significant components of the global carbon budget. Here we adapted the MAIDEN ecophysiological forest model to better consider important processes for boreal tree species, such as non-linear acclimation of photosynthesis to temperature changes, canopy development as a function of previous year climate variables influencing bud formation, and temperature dependence of carbon partition in summer. We tested these modifications in the eastern Canadian taiga using black spruce (Picea mariana (Mill.) B.S.P.) gross primary production and ring-width data. MAIDEN explains 90 % of the observed daily gross primary production variability, 73 % of the full spectrum of the annual ring width variability and 20–30 % of its high frequency component. The positive effect on stem growth due to climate warming in the last decades is well captured by the model. In addition, we illustrate the improvement achieved with each introduced model adaptation and compare the model results with those of linear response functions. This shows that MAIDEN simulates robust relationships with the most important climate variables (those detected by classical response-function analysis), and is a powerful tool for understanding how environmental factors interact with black spruce ecophysiology to influence present-day and future boreal forest carbon fluxes.

Citation: Gennaretti, F., Gea-Izquierdo, G., Boucher, E., Berninger, F., Arseneault, D., and Guiot, J.: Ecophysiological modeling of the climate imprint on photosynthesis and carbon allocation to the tree stem in the North American boreal forest, Biogeosciences Discuss., doi:10.5194/bg-2017-51, in review, 2017.
Fabio Gennaretti et al.
Fabio Gennaretti et al.
Fabio Gennaretti et al.

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Short summary
We use a model-data fusion approach to study how boreal forests assimilate and allocate carbon depending on weather/climate conditions. First, we adapted the MAIDEN ecophysiological forest model to consider important processes for boreal tree species. We tested the modifications on black spruce gross primary production and ring-width data. We show that MAIDEN is a powerful tool for understanding how environmental factors interact with tree ecophysiology to influence boreal forest carbon fluxes.
We use a model-data fusion approach to study how boreal forests assimilate and allocate carbon...
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