Processes and mechanisms of coastal woody-plant mortality
McDowell, Nate G. (Washington State University. School of Biological Sciences)
Ball, Marilyn (The Australian National University. Research School of Biology)
Bond-Lamberty, Ben (Joint Global Change Research Institute (USA))
Kirwan, Mathew L. (Virginia Institute of Marine Science)
Krauss, Ken W. (United States Geological Survey)
Megonigal, J. Patrick (Smithsonian Environmental Research Center)
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ward, Nicholas D. (University of Washington. School of Oceanography)
Weintraub, Michael N. (University of Toledo. Department of Environmental Sciences)
Bailey, Vanessa (Pacific Northwest National Laboratory. Biological Sciences Division)

Data:	2022
Resum:	Observations of woody plant mortality in coastal ecosystems are globally widespread, but the overarching processes and underlying mechanisms are poorly understood. This knowledge deficiency, combined with rapidly changing water levels, storm surges, atmospheric CO, and vapor pressure deficit, creates large predictive uncertainty regarding how coastal ecosystems will respond to global change. Here, we synthesize the literature on the mechanisms that underlie coastal woody-plant mortality, with the goal of producing a testable hypothesis framework. The key emergent mechanisms underlying mortality include hypoxic, osmotic, and ionic-driven reductions in whole-plant hydraulic conductance and photosynthesis that ultimately drive the coupled processes of hydraulic failure and carbon starvation. The relative importance of these processes in driving mortality, their order of progression, and their degree of coupling depends on the characteristics of the anomalous water exposure, on topographic effects, and on taxa-specific variation in traits and trait acclimation. Greater inundation exposure could accelerate mortality globally; however, the interaction of changing inundation exposure with elevated CO, drought, and rising vapor pressure deficit could influence mortality likelihood. Models of coastal forests that incorporate the frequency and duration of inundation, the role of climatic drivers, and the processes of hydraulic failure and carbon starvation can yield improved estimates of inundation-induced woody-plant mortality.
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Carbon starvation ; Coastal ; Climate change ; Hydraulic failure ; Hypoxia ; Mortality ; Salinity ; Sea level rise
Publicat a:	Global change biology, Vol. 28, Issue 20 (October 2022) , p. 5881-5900, ISSN 1365-2486

DOI: 10.1111/gcb.16297
PMID: 35689431

20 p, 5.1 MB

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