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Journal Article

Impacts of trait variation through observed trait–climate relationships on performance of an Earth system model: a conceptual analysis

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons62339

Bönisch,  Gerhard
Interdepartmental Max Planck Fellow Group Functional Biogeography, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62433

Kattge,  Jens
TRY: Global Initiative on Plant Traits, Dr. J. Kattge, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society;
Interdepartmental Max Planck Fellow Group Functional Biogeography, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Fulltext (public)

BGC1743.pdf
(Publisher version), 3MB

BGC1743D.pdf
(Publisher version), 2MB

Supplementary Material (public)

BGC1743s1.pdf
(Supplementary material), 252KB

Citation

Verheijen, L. M., Brovkin, V., Aerts, R., Bönisch, G., Cornelissen, J. H. C., Kattge, J., et al. (2013). Impacts of trait variation through observed trait–climate relationships on performance of an Earth system model: a conceptual analysis. Biogeosciences, 10, 5497-5515. doi:10.5194/bg-10-5497-2013.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-B986-D
Abstract
In many current dynamic global vegetation models (DGVMs), including those incorporated into Earth system models (ESMs), terrestrial vegetation is represented by a small number of plant functional types (PFTs), each with fixed properties irrespective of their predicted occurrence. This contrasts with natural vegetation, in which many plant traits vary systematically along geographic and environmental gradients. In the JSBACH DGVM, which is part of the MPI-ESM, we allowed three traits (specific leaf area (SLA), maximum carboxylation rate at 25 C (Vcmax25) and maximum electron transport rate at 25 C (Jmax25)) to vary within PFTs via trait–climate relationships based on a large trait database. The R2 adjusted of these relationships were up to 0.83 and 0.71 for Vcmax25 and Jmax25, respectively. For SLA, more variance remained unexplained, with a maximum R2 adjusted of 0.40. Compared to the default simulation, allowing trait variation within PFTs resulted in gross primary productivity differences of up to 50% in the tropics, in >35% different dominant vegetation cover, and a closer match with a natural vegetation map. The discrepancy between default trait values and natural trait variation, combined with the substantial changes in simulated vegetation properties, together emphasize that incorporating climate-driven trait variation, calibrated on observational data and based on ecological concepts, allows more variation in vegetation responses in DGVMs and as such is likely to enable more reliable projections in unknown climates.