Articles | Volume 16, issue 4
Biogeosciences, 16, 903–916, 2019
https://doi.org/10.5194/bg-16-903-2019
Biogeosciences, 16, 903–916, 2019
https://doi.org/10.5194/bg-16-903-2019

Research article 26 Feb 2019

Research article | 26 Feb 2019

Examining the evidence for decoupling between photosynthesis and transpiration during heat extremes

Martin G. De Kauwe et al.

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Cited articles

Ameye, M., Wertin, T. M., Bauweraerts, I., McGuire, M. A., Teskey, R. O., and Steppe, K.: The effect of induced heat waves on Pinus taeda and Quercus rubra seedlings in ambient and elevated CO2 atmospheres, New Phytol., 196, 448–461, 2012. 
Berbigier, P., Bonnefond, J.-M., and Mellmann, P.: CO2 and water vapour fluxes for 2 years above Euroflux forest site, Agricult. Forest Meteorol., 108, 183–197, 2001. 
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Short summary
Recent experimental evidence suggests that during heat extremes, trees may reduce photosynthesis to near zero but increase transpiration. Using eddy covariance data and examining the 3 days leading up to a temperature extreme, we found evidence of reduced photosynthesis and sustained or increased latent heat fluxes at Australian wooded flux sites. However, when focusing on heatwaves, we were unable to disentangle photosynthetic decoupling from the effect of increasing vapour pressure deficit.
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