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The combined effect of branch position, temperature, and VPD on gas exchange and water-use efficiency of Norway spruce

Petek-Petrik, A.; Húdoková, H.; Fleischer, P.; Jamnická, G.; Kurjak, D.; Sliacka Konôpková, Alena; Petrík, Peter 1
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

The impact of climate change on the physiological processes of Norway spruce in Central Europe is a significant concern. The increased temperature and evaporative demand associated with climate change may negatively affect its photosynthesis and carbon-water balance. This study tests the combined effect of branch position, temperature (T) and water vapour pressure deficit (VPD) on net photosynthetic rate (PN), water vapour stomatal conductance (gs), and intrinsic water-use efficiency (WUEi) of Norway spruce. More than 11 000 gas-exchange measurements during the summer of 2018 revealed that branch position significantly affects gas exchange and WUEi of juvenile Norway spruce trees. Northern branches showed on average 21% increased PN, 35% higher gs, and 8% lower WUEi compared to the southern branches (across T and VPD conditions). The PN and gs differences between the branches were temperature- and VPD-dependent. We observed the negative impact of raising temperature on gas exchange and WUEi for both treatments, with a 40°C threshold causing a rapid decline in WUEi. Variability of the southern branches' WUEi at 42°C was abruptly increased due to the decoupling of PN and gs (low PN, high gs). ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0006-3134, 1573-8264
KITopen-ID: 1000161352
HGF-Programm 12.11.24 (POF IV, LK 01) Adaptation of natural landscapes to climate change
Erschienen in Biologia plantarum
Verlag Springer-Verlag
Band 67
Seiten 136 – 141
Vorab online veröffentlicht am 15.06.2023
Schlagwörter intrinsic water-use efficiency, photosynthesis, Picea abies, stomatal conductance
Nachgewiesen in Scopus
Dimensions
Web of Science

Verlagsausgabe §
DOI: 10.5445/IR/1000161352
Veröffentlicht am 11.08.2023
Originalveröffentlichung
DOI: 10.32615/bp.2023.017
Scopus
Zitationen: 4
Web of Science
Zitationen: 3
Dimensions
Zitationen: 5
Seitenaufrufe: 91
seit 11.08.2023
Downloads: 61
seit 13.08.2023
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