The ant and the grasshopper: Contrasting responses and behaviors to water stress of riparian trees along a hydroclimatic gradient.

Autor: Lochin P; ENS de Lyon, UMR 5600 Environnement Ville société, CNRS, Lyon, France. Electronic address: pierre.lochin@ens-lyon.fr., Malherbe P; ENS de Lyon, UMR 5600 Environnement Ville société, CNRS, Lyon, France., Marteau B; ENS de Lyon, UMR 5600 Environnement Ville société, CNRS, Lyon, France; LETG UMR 6554, Université Rennes 2, Rennes, France., Godfroy J; ENS de Lyon, UMR 5600 Environnement Ville société, CNRS, Lyon, France; Univ. Grenoble Alpes, INRAE, LESSEM, F-38402 St-Martin d'Hères, France., Gerle F; Université Claude Bernard Lyon 1, LEHNA UMR 5023, CNRS, ENTPE, F-69622, Villeurbanne, France., Marshall J; Global Change Research Institute, Czech Academy of Sciences, Bělidla 4a, 603 00 Brno, Czech Republic; Leibniz-Zentrum für Agrarlandschaftsforschung, 15374 Müncheberg, Germany; Department of Geological Sciences, Gothenburg University, Gothenburg, Sweden., Puijalon S; Université Claude Bernard Lyon 1, LEHNA UMR 5023, CNRS, ENTPE, F-69622, Villeurbanne, France., Singer MB; Earth Research Institute, University of California, Santa Barbara, CA 93106, USA; Water Research Institute, Cardiff University, Cardiff CF10 3AX, UK; School of Earth and Environmental Sciences, Cardiff University, Cardiff CF10 3AT, UK., Stella JC; Department of Sustainable Resources Management, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA., Piégay H; ENS de Lyon, UMR 5600 Environnement Ville société, CNRS, Lyon, France., Vernay A; Université Claude Bernard Lyon 1, LEHNA UMR 5023, CNRS, ENTPE, F-69622, Villeurbanne, France.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Nov 20; Vol. 952, pp. 175916. Date of Electronic Publication: 2024 Sep 01.
DOI: 10.1016/j.scitotenv.2024.175916
Abstrakt: Riparian trees are particularly vulnerable to drought because they are highly dependent on water availability for their survival. However, the response of riparian tree species to water stress varies depending on regional hydroclimatic conditions, making them unevenly vulnerable to changing drought patterns. Understanding this spatial variability in stress responses requires a comprehensive assessment of water stress across broader spatial and temporal scales. Yet, the precise ecophysiological mechanisms underlying these responses remain poorly linked to remotely sensed indices. To address this gap, the implementation of remote sensing methods coupled with in situ validation is essential to obtain consistent results across diverse spatial and temporal contexts. We conducted a multi-tool analysis combining multispectral and thermal remote sensing indices with in situ ecophysiological measurements at different temporal scales to analyze the responses of white poplar (Populus alba) to seasonal changes in drought along a hydroclimatic gradient. Using this approach, we demonstrate that white poplars along the Rhône River (France) exhibit contrasting responses and behaviors during drought depending on the latitudinal context. White poplars in a Mediterranean climate show rapid stomatal closure to reduce water loss and maintain high minimum water potential levels, although this results in a decrease in remotely sensed greenness. Conversely, white poplars located upstream in a temperate climate show high transpiration and stable greenness but lower minimum water potential and water content. A site in the middle of the gradient has intermediate responses. These results demonstrate that white poplars along a climate gradient can have a range of responses to drought along the iso/anisohydricity continuum. These results are important for future climatic conditions because they show that the same species can have different mechanisms of drought resilience, even in the same river valley. This raises questions regarding how these riparian tree populations will respond to future climatic and hydrological conditions.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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