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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; Birami, Benjamin; Nadal Sala, Daniel; Ruehr, Nadine Katrin

Abstract:
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

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Verlagsausgabe §
DOI: 10.5445/IR/1000129582
Veröffentlicht am 10.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2021
Sprache Englisch
Identifikator ISSN: 0140-7791, 1365-3040
KITopen-ID: 1000129582
Erschienen in Plant, cell & environment
Verlag Wiley
Band 44
Heft 2
Seiten 356–370
Vorab online veröffentlicht am 10.12.2020
Schlagwörter drought; net C balance; non‐structural carbohydrates; respiration; tree mortality; turgor loss; water‐use‐efficiency
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