Mechanisms of a coniferous woodland persistence under drought and heat

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Title: Mechanisms of a coniferous woodland persistence under drought and heat
Authors: McDowell, Nate G. | Grossiord, Charlotte | Adams, Henry D. | Pinzón-Navarro, Sara | Mackay, D. Scott | Breshears, David D. | Allen, Craig D. | Borrego, Isaac | Dickman, L Turin. | Collins, Adam | Gaylord, Monica | McBranch, Natalie | Pockman, William T. | Vilagrosa, Alberto | Aukema, Brian | Goodsman, Devin | Xu, Chonggang
Research Group/s: Gestión de Ecosistemas y de la Biodiversidad (GEB)
Center, Department or Service: Universidad de Alicante. Departamento de Ecología | CEAM (Centro de Estudios Ambientales del Mediterraneo)
Keywords: Drought | Warming | Die-off | Precipitation | Refugia
Knowledge Area: Ecología
Issue Date: 16-Apr-2019
Publisher: IOP Publishing
Citation: Environmental Research Letters. 2019, 14(4): 045014. doi:10.1088/1748-9326/ab0921
Abstract: Predictions 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 (~45% removal), heat (+4 °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 piñon. 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.
Sponsor: This project was supported by the Department of Energy, Office of Science, and Pacific Northwest National Lab’s LDRD program. DDB participation was supported via NSF EF-1340624; EF-1550756, and EAR-1331408, DEB-1824796 and DEB-1833502. CG was supported by a Director’s Fellowship from the Los Alamos National Laboratory and by the Swiss National Science Foundation SNF (PZ00P3_174068). AV was supported by a fellowship from Generalitat Valenciana (BEST/2016/289) and the project Survive-2 (CGL2015-69773-C2-2-P MINECO/FEDER) from the Spanish Government. DSM was supported via NSF IOS-1450679, IOS-1444571, and IOS-1547796.
ISSN: 1748-9326
DOI: 10.1088/1748-9326/ab0921
Language: eng
Type: info:eu-repo/semantics/article
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.
Peer Review: si
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Appears in Collections:INV - GEB - Artículos de Revistas

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