Hydraulically-vulnerable trees survive on deep-water access during droughts in a tropical forest

Bibliographische Detailangaben
Veröffentlicht in:	The New phytologist. - 1979. - 231(2021), 5 vom: 16. Sept., Seite 1798-1813
1. Verfasser:	Chitra-Tarak, Rutuja (VerfasserIn)
Weitere Verfasser:	Xu, Chonggang, Aguilar, Salomón, Anderson-Teixeira, Kristina J, Chambers, Jeff, Detto, Matteo, Faybishenko, Boris, Fisher, Rosie A, Knox, Ryan G, Koven, Charles D, Kueppers, Lara M, Kunert, Nobert, Kupers, Stefan J, McDowell, Nate G, Newman, Brent D, Paton, Steven R, Pérez, Rolando, Ruiz, Laurent, Sack, Lawren, Warren, Jeffrey M, Wolfe, Brett T, Wright, Cynthia, Wright, S Joseph, Zailaa, Joseph, McMahon, Sean M
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2021
Zugriff auf das übergeordnete Werk:	The New phytologist
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. deep-water access drought tolerance drought-induced mortality hydraulic vulnerability and safety margins hydrological droughts rooting depths safety-efficiency trade-off mehr... tropical forest Water 059QF0KO0R

Beschreibung
Zusammenfassung:	No claim to original US Government works New Phytologist © 2021 New Phytologist Foundation. Deep-water access is arguably the most effective, but under-studied, mechanism that plants employ to survive during drought. Vulnerability to embolism and hydraulic safety margins can predict mortality risk at given levels of dehydration, but deep-water access may delay plant dehydration. Here, we tested the role of deep-water access in enabling survival within a diverse tropical forest community in Panama using a novel data-model approach. We inversely estimated the effective rooting depth (ERD, as the average depth of water extraction), for 29 canopy species by linking diameter growth dynamics (1990-2015) to vapor pressure deficit, water potentials in the whole-soil column, and leaf hydraulic vulnerability curves. We validated ERD estimates against existing isotopic data of potential water-access depths. Across species, deeper ERD was associated with higher maximum stem hydraulic conductivity, greater vulnerability to xylem embolism, narrower safety margins, and lower mortality rates during extreme droughts over 35 years (1981-2015) among evergreen species. Species exposure to water stress declined with deeper ERD indicating that trees compensate for water stress-related mortality risk through deep-water access. The role of deep-water access in mitigating mortality of hydraulically-vulnerable trees has important implications for our predictive understanding of forest dynamics under current and future climates
Beschreibung:	Date Completed 12.08.2021 Date Revised 29.09.2021 published: Print-Electronic Citation Status MEDLINE
ISSN:	1469-8137
DOI:	10.1111/nph.17464