Articles | Volume 22, issue 6
https://doi.org/10.5194/bg-22-1557-2025
https://doi.org/10.5194/bg-22-1557-2025
Research article
 | 
25 Mar 2025
Research article |  | 25 Mar 2025

Water usage of old-growth oak at elevated CO2 in the FACE (Free-Air CO2 Enrichment) of climate change

Susan E. Quick, Giulio Curioni, Nicholas J. Harper, Stefan Krause, and A. Robert MacKenzie

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Cited articles

Aranda, I., Forner, A., Cuesta, B., and Valladares, F.: Species-specific water use by forest tree species: From the tree to the stand, Agric. Water Manag., 114, 67–77, https://doi.org/10.1016/J.AGWAT.2012.06.024, 2012. 
Aszalós, R., Horváth, F., Mázsa, K., Ódor, P., Lengyel, A., Kovács, G., and Bölöni, J.: First signs of old-growth structure and composition of an oak forest after four decades of abandonment, Biologia, 72, 1264–1274, https://doi.org/10.1515/biolog-2017-0139, 2017. 
Baldocchi, D., Falge, E., Gu, L., Olson, R., Hollinger, D., Running, S., Anthoni, P., Bernhofer, C., Davis, K., Evans, R., Fuentes, J., Goldstein, A., Katul, G., Law, B., Lee, X., Malhi, Y., Meyers, T., Munger, J., Oechel, W., and Richardson, F.: FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem–Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities, Am. Meteorol. Soc., 82, https://doi.org/10.1175/1520-0477(2001)082<2415:FANTTS>2.3.CO;2, 2001. 
BIFoR PhenoCam: https://phenocam.nau.edu/webcam/roi/%0Amillhaft/DB_1000/, last access: 10 July 2023. 
Bradwell, J.: Norbury Park An Estate Tackling Climate Change, Second edn., Norbury Park, Staffordshire, UK, ISBN 10: 1527297349, 2022. 
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Short summary
To study the effects of rising CO2 levels on water usage of old-growth temperate oak forest, we monitored trees in an open-air elevated CO2 experiment for 5 years. We found 4 %–16 % leaf-on season reduction in daylight water usage for ~35% increase in atmospheric CO2. July-only reduction varied more widely. Tree water usage depended on tree size, i.e. stem size and projected canopy area, across all treatments. Experimental infrastructure increased the water usage of the trees in leaf-on season.
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