Impacts of elevated CO2 levels and temperature on photosynthesis and stomatal closure along an altitudinal gradient are counteracted by the rising atmospheric vapor pressure deficit

0585293 - ÚVGZ 2025 RIV NL eng J - Článek v odborném periodiku
Pernicová, Natálie - Urban, Otmar - Čáslavský, Josef - Kolář, Tomáš - Rybníček, Michal - Sochová, Irena - Penuelas, Josep - Bošeľa, M. - Trnka, Miroslav
Impacts of elevated CO2 levels and temperature on photosynthesis and stomatal closure along an altitudinal gradient are counteracted by the rising atmospheric vapor pressure deficit.
Science of the Total Environment. Roč. 921, APR (2024), č. článku 171173. ISSN 0048-9697. E-ISSN 1879-1026
Grant CEP: GA ČR GA23-07583S; GA MŠMT(CZ) EH22_008/0004635
Institucionální podpora: RVO:86652079
Klíčová slova: water-use efficiency * carbon-isotope discrimination * tree growth * norway spruce * elevational gradient * stable-isotopes * climate * transpiration * responses * oak * Altitudinal gradient * Climate change * Chronologies * Plant water use efficiency * Quercus spp. * Tree-ring carbon isotopes
Obor OECD: Meteorology and atmospheric sciences
Impakt faktor: 9.8, rok: 2022
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S0048969724013123?via%3Dihub

The efficiency of water use in plants, a critical ecophysiological parameter closely related to water and carbon cycles, is essential for understanding the interactions between plants and their environment. This study investigates the effects of ongoing climate change and increasing atmospheric CO2 concentration on intrinsic (stomatabased, iWUE) and evaporative (transpirationbased, eWUE) water use efficiency in oak trees along a naturally small altitudinal gradient (130-630 m a.s.l.) of Vihorlat Mountains (eastern Slovakia, Central Europe). To assess changes in iWUE and eWUE values over the past 60 years (1961-2020), stable carbon isotope ratios in latewood cellulose (delta 13Ccell) of annually resolved tree rings were analyzed. Such an approach was sensitive enough to distinguish tree responses to growth environments at different altitudes. Our findings revealed a rising trend in iWUE, particularly in oak trees at low and middle altitudes. However, this increase was negligible at high altitudes. Warmer and drier conditions at lower altitudes likely led to significant stomatal closure and enhanced efficiency in photosynthetic CO2 uptake due to rising CO2 concentration. Conversely, the increasing intracellulartoambient CO2 ratio (Ci/Ca) at higher altitudes indicated lower efficiency in photosynthetic CO2 uptake. In contrast to iWUE, eWUE showed no increasing trends over the last 60 years. This suggests that the positive impacts of elevated CO2 concentrations and temperature on photosynthesis and stomatal closure are counteracted by the rising atmospheric vapor pressure deficit (VPD). These differences underscore the importance of the correct interpretation of stomatabased and transpirationbased WUEs and highlight the necessity of atmospheric VPD correction when applying treering 613Cderived WUE at ecosystem and global levels.
Trvalý link: https://hdl.handle.net/11104/0353021

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