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Vapour pressure deficit was not a primary limiting factor for gas exchange in an irrigated, mature dryland Aleppo pine forest

Preisler, Yakir ; Grünzweig, José M.; Ahiman, Ori; Amer, Madi; Oz, Itai; Feng, Xue; Muller, Jonathan D.; Rühr, Nadine ORCID iD icon 1; Rotenberg, Eyal; Birami, Benjamin 2; Yakir, Dan
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)

Abstract:

Climate change is often associated with increasing vapour pressure deficit (VPD) and changes in soil moisture (SM). While atmospheric and soil drying often co-occur, their differential effects on plant functioning and productivity remain uncertain. We investigated the divergent effects and underlying mechanisms of soil and atmospheric drought based on continuous, in situ measurements of branch gas exchange with automated chambers in a mature semiarid Aleppo pine forest. We investigated the response of control trees exposed to combined soil‒atmospheric drought (low SM, high VPD) during the rainless Mediterranean summer and that of trees experimentally unconstrained by soil dryness (high SM; using supplementary dry season water supply) but subjected to atmospheric drought (high VPD). During the seasonal dry period, branch conductance (g$_{br}$), transpiration rate (E) and net photosynthesis (A$_{net}$) decreased in low-SM trees but greatly increased in high-SM trees. The response of E and g$_{br}$ to the massive rise in VPD (to 7 kPa) was negative in low-SM trees and positive in high-SM trees. These observations were consistent with predictions based on a simple plant hydraulic model showing the importance of plant water potential in the g$_{br}$ and E response to VPD. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162409
Veröffentlicht am 27.09.2023
Originalveröffentlichung
DOI: 10.1111/pce.14712
Scopus
Zitationen: 3
Web of Science
Zitationen: 2
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0140-7791, 1365-3040
KITopen-ID: 1000162409
HGF-Programm 12.11.24 (POF IV, LK 01) Adaptation of natural landscapes to climate change
Erschienen in Plant Cell and Environment
Verlag John Wiley and Sons
Band 46
Heft 12
Seiten 3775-3790
Vorab online veröffentlicht am 07.09.2023
Schlagwörter automated branch chambers, drought, irrigation, semiarid, soil moisture, supply and demand, transpiration, VPD, water potential
Nachgewiesen in Scopus
Dimensions
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 13 – Maßnahmen zum Klimaschutz
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