Detecting forest response to droughts with global observations of vegetation water content
Konings, Alexandra G. (Stanford University)
Saatchi, Sassan S. (California Institute of Technology (Estats Units d'Amèrica))
Frankenberg, Christian (California Institute of Technology (Estats Units d'Amèrica))
Keller, Michael (United States Forest Service)
Leshyk, Victor (Northern Arizona University)
Anderegg, William R. L. (University of Utah)
Humphrey, Vincent (California Institute of Technology (Estats Units d'Amèrica))
Matheny, Ashley M. (University of Texas)
Trugman, Anna T. (University of California)
Sack, Lawren (University of California)
Agee, Elizabeth (Oak Ridge National Laboratory)
Barnes, Mallory L. (Indiana University-Bloomington)
Binks, Oliver (The Australian National University)
Cawse-Nicholson, Kerry (California Institute of Technology (Estats Units d'Amèrica))
Christoffersen, Bradley O. (University of Texas)
Entekhabi, Dara (Massachusetts Institute of Technology)
Gentine, Pierre (Columbia University)
Holtzman, Nataniel M. (Stanford University)
Katul, Gabriel G. (Duke University)
Liu, Yanlan (The Ohio State University)
Longo, Marcos (California Institute of Technology (Estats Units d'Amèrica))
Martínez Vilalta, Jordi 1975- (Universitat Autònoma de Barcelona)
McDowell, Nate G. (Washington State University)
Meir, Patrick (University of Edinburgh)
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Mrad, Assaad (University of California)
Novick, Kimberly A. (Indiana University-Bloomington)
Oliveira, Rafael S. (University of Campinas)
Siqueira, Paul (University of Massachusetts)
Steele-Dunne, Susan C. (Delft University of Technology)
Thompson, David R. (California Institute of Technology (Estats Units d'Amèrica))
Wang, Yujie (California Institute of Technology (Estats Units d'Amèrica))
Wehr, Richard (University of Arizona)
Wood, Jeffrey D. (University of Missouri)
Xu, Xiangtao (Cornell University)
Zuidema, Pieter (Wageningen University)

Fecha:	2021
Resumen:	Droughts in a warming climate have become more common and more extreme, making understanding forest responses to water stress increasingly pressing. Analysis of water stress in trees has long focused on water potential in xylem and leaves, which influences stomatal closure and water flow through the soil-plant-atmosphere continuum. At the same time, changes of vegetation water content (VWC) are linked to a range of tree responses, including fluxes of water and carbon, mortality, flammability, and more. Unlike water potential, which requires demanding in situ measurements, VWC can be retrieved from remote sensing measurements, particularly at microwave frequencies using radar and radiometry. Here, we highlight key frontiers through which VWC has the potential to significantly increase our understanding of forest responses to water stress. To validate remote sensing observations of VWC at landscape scale and to better relate them to data assimilation model parameters, we introduce an ecosystem-scale analog of the pressure-volume curve, the non-linear relationship between average leaf or branch water potential and water content commonly used in plant hydraulics. The sources of variability in these ecosystem-scale pressure-volume curves and their relationship to forest response to water stress are discussed. We further show to what extent diel, seasonal, and decadal dynamics of VWC reflect variations in different processes relating the tree response to water stress. VWC can also be used for inferring belowground conditions-which are difficult to impossible to observe directly. Lastly, we discuss how a dedicated geostationary spaceborne observational system for VWC, when combined with existing datasets, can capture diel and seasonal water dynamics to advance the science and applications of global forest vulnerability to future droughts.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article de revisió ; recerca ; Versió publicada
Publicado en:	Global change biology, Vol. 27, Issue 23 (December 2021) , p. 6005-6024, ISSN 1365-2486

DOI: 10.1111/gcb.15872
PMID: 34478589

20 p, 2.4 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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