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  Does the growth response of woody plants to elevated CO2 increase with temperature? A model-oriented meta-analysis

Baig, S., Medlyn, B. E.., Mercado, L. M., & Zaehle, S. (2015). Does the growth response of woody plants to elevated CO2 increase with temperature? A model-oriented meta-analysis. Global Change Biology, 21(12), 4303-4319. doi:10.1111/gcb.12962.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-002B-72D0-1 Versions-Permalink: https://hdl.handle.net/21.11116/0000-000A-414D-7
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 Urheber:
Baig, Sofia, Autor
Medlyn, Belinda E ., Autor
Mercado, Lina M., Autor
Zaehle, Sönke1, 2, Autor           
Affiliations:
1Terrestrial Biosphere Modelling, Dr. Sönke Zähle, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938309              
2Terrestrial Biosphere Modelling, Dr. Sönke Zähle, Department Biogeochemical Integration, Prof. Dr. Martin Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497787              

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 Zusammenfassung: The temperature dependence of the reaction kinetics of the Rubisco enzyme implies that, at the level of a chloroplast, the response of photosynthesis to rising atmospheric CO2 concentration (Ca) will increase with increasing air temperature. Vegetation models incorporating this interaction predict that the response of net primary productivity (NPP) to elevated CO2 (eCa) will increase with rising temperature and will be substantially larger in warm tropical forests than in cold boreal forests. We tested these model predictions against evidence from eCa experiments by carrying out two meta-analyses. Firstly, we tested for an interaction effect on growth responses in factorial eCa × temperature experiments. This analysis showed a positive, but nonsignificant interaction effect (95% CI for above-ground biomass response = −0.8, 18.0%) between eCa and temperature. Secondly, we tested field-based eCa experiments on woody plants across the globe for a relationship between the eCa effect on plant biomass and mean annual temperature (MAT). This second analysis showed a positive but nonsignificant correlation between the eCa response and MAT. The magnitude of the interactions between CO2 and temperature found in both meta-analyses were consistent with model predictions, even though both analyses gave nonsignificant results. Thus, we conclude that it is not possible to distinguish between the competing hypotheses of no interaction vs. an interaction based on Rubisco kinetics from the available experimental database. Experiments in a wider range of temperature zones are required. Until such experimental data are available, model predictions should aim to incorporate uncertainty about this interaction.

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 Datum: 20152015-09-222015
 Publikationsstatus: Erschienen
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 Identifikatoren: Anderer: BGC2517
DOI: 10.1111/gcb.12962
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Titel: Global Change Biology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, UK : Blackwell Science
Seiten: - Band / Heft: 21 (12) Artikelnummer: - Start- / Endseite: 4303 - 4319 Identifikator: ISSN: 1354-1013
CoNE: https://pure.mpg.de/cone/journals/resource/954925618107