Articles | Volume 19, issue 17
Biogeosciences, 19, 4387–4414, 2022
https://doi.org/10.5194/bg-19-4387-2022

Special issue: Global change effects on terrestrial biogeochemistry at the...

Biogeosciences, 19, 4387–4414, 2022
https://doi.org/10.5194/bg-19-4387-2022
Research article
14 Sep 2022
Research article | 14 Sep 2022

Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models

Stefano Manzoni et al.

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Cited articles

Adams, M. A., Buckley, T. N., and Turnbull, T. L.: Diminishing CO2-driven gains in water-use efficiency of global forests, Nat. Clim. Change, 10, 466–471, https://doi.org/10.1038/s41558-020-0747-7, 2020. 
Ainsworth, E. A. and Long, S. P.: What have we learned from 15 years of free-air CO2 enrichment (FACE)?, A meta-analytic review of the responses of photosynthesis, canopy properties and plant production to rising CO2, New Phytol., 165, 351–371, 2005. 
Bader, M., Leuzinger, S., Keel, S., Siegwolf, R., Hagedorn, F., Schleppi, P., and Korner, C.: Central European hardwood trees in a high-CO2 future: synthesis of an 8-year forest canopy CO2 enrichment project, J. Ecol., 101, 1509–1519, https://doi.org/10.1111/1365-2745.12149, 2013. 
Bassiouni, M. and Vico, G.: Parsimony vs predictive and functional performance of three stomatal optimization principles in a big-leaf framework, New Phytol., 231, 586–600, https://doi.org/10.1111/nph.17392, 2021. 
Bell, L.: Relative growth rate, resource allocation and root morphology in the perennial legumes, Medicago sativa, Dorycnium rectum and D-hirsutum grown under controlled conditions, Plant Soil, 270, 199–211, https://doi.org/10.1007/s11104-004-1495-6, 2005. 
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Short summary
Increasing atmospheric carbon dioxide (CO2) causes leaves to close their stomata (through which water evaporates) but also promotes leaf growth. Even if individual leaves save water, how much will be consumed by a whole plant with possibly more leaves? Using different mathematical models, we show that plant stands that are not very dense and can grow more leaves will benefit from higher CO2 by photosynthesizing more while adjusting their stomata to consume similar amounts of water.
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