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Dying by drying: Timing of physiological stress thresholds related to tree death is not significantly altered by highly elevated CO$_{2}$

Gattmann, Marielle 1; Birami, Benjamin 1; Nadal Sala, Daniel 2; Ruehr, Nadine Katrin 1
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)
2 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)


Drought‐induced tree mortality is expected to occur more frequently under predicted climate change. However, the extent of a possibly mitigating effect of simultaneously rising atmospheric [CO$_{2}$] on stress thresholds leading to tree death is not fully understood, yet. Here, we studied the drought response, the time until critical stress thresholds were reached and mortality occurrence of Pinus halepensis (Miller). In order to observe a large potential benefit from eCO$_{2}$, the seedlings were grown with ample of water and nutrient supply under either highly elevated [CO$_{2}$] (eCO$_{2}$, c. 936 ppm) or ambient (aCO$_{2}$, c. 407 ppm) during 2 years. The subsequent exposure to a fast or a slow lethal drought was monitored using whole‐tree gas exchange chambers, measured leaf water potential and non‐structural carbohydrates. Using logistic regressions to derive probabilities for physiological parameters to reach critical drought stress thresholds, indicated a longer period for halving needle starch storage under eCO$_{2}$ than aCO$_{2}$. Stomatal closure, turgor loss, the duration until the daily tree C balance turned negative, leaf water potential at thresholds and time‐of‐death were unaffected by eCO$_{2}$. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000129582
Veröffentlicht am 10.02.2021
DOI: 10.1111/pce.13937
Zitationen: 7
Web of Science
Zitationen: 9
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 0140-7791, 1365-3040
KITopen-ID: 1000129582
HGF-Programm 12.11.24 (POF IV, LK 01) Forest resilience to climate change
Erschienen in Plant, cell & environment
Verlag John Wiley and Sons
Band 44
Heft 2
Seiten 356–370
Schlagwörter drought; net C balance; non‐structural carbohydrates; respiration; tree mortality; turgor loss; water‐use‐efficiency
Nachgewiesen in Dimensions
Web of Science
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