Mechanisms of a coniferous woodland persistence under drought and heat
AuthorMcDowell, Nate G
Adams, Henry D
Mackay, D Scott
Breshears, David D
Allen, Craig D
Dickman, L Turin
Pockman, William T
AffiliationUniv Arizona, Sch Nat Resources & Environm
Univ Arizona, Dept Ecol & Evolutionary Biol
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationNate G McDowell et al 2019 Environ. Res. Lett. 14 045014
JournalENVIRONMENTAL RESEARCH LETTERS
Rights© 2019 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractPredictions of warmer droughts causing increasing forest mortality are becoming abundant, yet few studies have investigated the mechanisms of forest persistence. To examine the resistance of forests to warmer droughts, we used a five-year precipitation reduction (similar to 45% removal), heat (+4 degrees C above ambient) and combined drought and heat experiment in an isolated stand of mature Pinus edulis-Juniperus monosperma. Despite severe experimental drought and heating, no trees died, and we observed only minor evidence of hydraulic failure or carbon starvation. Two mechanisms promoting survival were supported. First, access to bedrock water, or 'hydraulic refugia' aided trees in their resistance to the experimental conditions. Second, the isolation of this stand amongst a landscape of dead trees precluded ingress by Ips confusus, frequently the ultimate biotic mortality agent of pinon. These combined abiotic and biotic landscape-scale processes can moderate the impacts of future droughts on tree mortality by enabling tree avoidance of hydraulic failure, carbon starvation, and exposure to attacking abiotic agents.
VersionFinal published version
SponsorsPacific Northwest National Lab's LDRD program; NSF [EF-1340624, EF-1550756, EAR-1331408, DEB-1824796, DEB-1833502, IOS-1450679, IOS-1444571, IOS-1547796]; Los Alamos National Laboratory; Swiss National Science Foundation SNF [PZ00P3_174068]; Generalitat Valenciana [BEST/2016/289]; project Survive-2 from the Spanish Government [CGL2015-69773-C2-2-P MINECO/FEDER]; Department of Energy, Office of Science