Mortality predispositions of conifers across western USA

Mortality predispositions of conifers across western USA

© 2020 The Authors New Phytologist © 2020 New Phytologist Trust.

Détails bibliographiques
Publié dans:The New phytologist. - 1979. - 229(2021), 2 vom: 01. Jan., Seite 831-844
Auteur principal: Wang, Wenzhi (Auteur)
Autres auteurs: English, Nathan B, Grossiord, Charlotte, Gessler, Arthur, Das, Adrian J, Stephenson, Nathan L, Baisan, Christopher H, Allen, Craig D, McDowell, Nate G
Format: Article en ligne
Langue:English
Publié: 2021
Accès à la collection:The New phytologist
Sujets:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. carbon starvation stable carbon and oxygen isotope tree growth tree mortality water-use efficiency western USA conifers Carbon Isotopes plus... Water 059QF0KO0R
Description
Résumé:© 2020 The Authors New Phytologist © 2020 New Phytologist Trust.
Conifer mortality rates are increasing in western North America, but the physiological mechanisms underlying this trend are not well understood. We examined tree-ring-based radial growth along with stable carbon (C) and oxygen (O) isotope composition (δ13 C and δ18 O, respectively) of dying and surviving conifers at eight old-growth forest sites across a strong moisture gradient in the western USA to retrospectively investigate mortality predispositions. Compared with surviving trees, lower growth of dying trees was detected at least one decade before mortality at seven of the eight sites. Intrinsic water-use efficiency increased over time in both dying and surviving trees, with a weaker increase in dying trees at five of the eight sites. C starvation was a strong correlate of conifer mortality based on a conceptual model incorporating growth, δ13 C, and δ18 O. However, this approach does not capture processes that occur in the final months of survival. Ultimately, C starvation may lead to increased mortality vulnerability, but hydraulic failure or biotic attack may dominate the process during the end stages of mortality in these conifers
Description:Date Completed 14.05.2021
Date Revised 14.05.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.16864