Increasing temperature and vapour pressure deficit lead to hydraulic damages in the absence of soil drought.

Autor: Schönbeck LC; Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC, EPFL, Lausanne, Switzerland.; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Lausanne, Switzerland.; Department of Botany & Plant Sciences, University of California, Riverside, Riverside, California, USA., Schuler P; Forest Dynamics Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Birmensdorf, Switzerland.; Institute of Agricultural Sciences, ETH Zurich, Zurich, Switzerland., Lehmann MM; Forest Dynamics Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Birmensdorf, Switzerland., Mas E; Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC, EPFL, Lausanne, Switzerland.; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Lausanne, Switzerland., Mekarni L; Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC, EPFL, Lausanne, Switzerland.; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Lausanne, Switzerland., Pivovaroff AL; Biology Division, Glendale Community College, Glendale, California, USA., Turberg P; Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC, EPFL, Lausanne, Switzerland.; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Lausanne, Switzerland., Grossiord C; Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering ENAC, EPFL, Lausanne, Switzerland.; Community Ecology Unit, Swiss Federal Institute for Forest, Snow and Landscape WSL, Lausanne, Switzerland.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2022 Nov; Vol. 45 (11), pp. 3275-3289. Date of Electronic Publication: 2022 Sep 01.
DOI: 10.1111/pce.14425
Abstrakt: Temperature (T) and vapour pressure deficit (VPD) are important drivers of plant hydraulic conductivity, growth, mortality, and ecosystem productivity, independently of soil water availability. Our goal was to disentangle the effects of T and VPD on plant hydraulic responses. Young trees of Fagus sylvatica L., Quercus pubescens Willd. and Quercus ilex L. were exposed to a cross-combination of a T and VPD manipulation under unlimited soil water availability. Stem hydraulic conductivity and leaf-level hydraulic traits (e.g., gas exchange and osmotic adjustment) were tracked over a full growing season. Significant loss of xylem conductive area (PLA) was found in F. sylvatica and Q. pubescens due to rising VPD and T, but not in Q. ilex. Increasing T aggravated the effects of high VPD in F. sylvatica only. PLA was driven by maximum hydraulic conductivity and minimum leaf conductance, suggesting that high transpiration and water loss after stomatal closure contributed to plant hydraulic stress. This study shows for the first time that rising VPD and T lead to losses of stem conductivity even when soil water is not limiting, highlighting their rising importance in plant mortality mechanisms in the future.
(© 2022 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
Externí odkaz: