气候变化领域集成服务门户(CCPortal): Rapid and surprising dieback of Utah juniper in the southwestern USA due to acute drought stress

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DOI	10.1016/j.foreco.2020.118639
	Rapid and surprising dieback of Utah juniper in the southwestern USA due to acute drought stress
	Kannenberg S.A.; Driscoll A.W.; Malesky D.; Anderegg W.R.L.
发表日期	2021
ISSN	0378-1127
卷号	480
英文摘要	For nearly two decades, the American Southwest has been in the grips of a long-term ‘megadrought’, punctuated by a number of short and severe ‘global change type droughts’ (i.e., negative precipitation anomalies co-occurring with high temperature). These events have caused widespread mortality of the drought-sensitive piñon pine (Pinus edulis) while co-dominant Juniperus spp. have historically been much more drought tolerant and thus have rarely died. However, a severe drought occurred in 2018 that rapidly (<1 year) caused canopy dieback of Juniperus osteosperma across a vast area of southeastern Utah. In order to uncover the etiology behind this surprising dieback event, we set up a series of survey plots that captured gradients in microclimate, topography, and dieback severity. We also quantified xylem hydraulic damage and assessed the presence of various biotic agents in declining junipers to identify the primary causes of this dieback. We observed that juniper canopy dieback was most severe (>60% canopy dieback) at hot, dry, low elevation sites, and was associated with drought-induced hydraulic damage. There was no evidence that biotic agents could be the primary drivers of this dieback, implicating the acute effects of drought as the main causal agent. The speed and scale of this drought-induced juniper dieback seems to be historically unprecedented in the region and foreshadows an uncertain future for piñon-juniper woodlands as the region continues to get warmer and drier. © 2020 Elsevier B.V.
英文关键词	Disease; Hydraulic damage; Insect; Juniperus osteosperma; Pinus edulis
语种	英语
scopus关键词	Damage detection; Topography; Drought stress; Global change; High temperature; Juniperus osteosperma; Juniperus spp; Pinus edulis; Precipitation anomalies; Drought; coniferous tree; dieback; disease severity; drought stress; etiology; hydraulic conductivity; microclimate; mortality; topography; xylem; Agents; Damage; Drought; High Temperature; Juniperus Osteosperma; Pinus Edulis; Topography; United States; Utah; Hexapoda; Juniperus; Juniperus osteosperma; Pinus edulis
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154863
作者单位	School of Biological Sciences, University of Utah, Salt Lake City, UT, United States; Forest Health Protection Region 1, U.S. Forest Service, Coeur d’ Alene, ID, United States
推荐引用方式 GB/T 7714	Kannenberg S.A.,Driscoll A.W.,Malesky D.,et al. Rapid and surprising dieback of Utah juniper in the southwestern USA due to acute drought stress[J],2021,480.
APA	Kannenberg S.A.,Driscoll A.W.,Malesky D.,&Anderegg W.R.L..(2021).Rapid and surprising dieback of Utah juniper in the southwestern USA due to acute drought stress.Forest Ecology and Management,480.
MLA	Kannenberg S.A.,et al."Rapid and surprising dieback of Utah juniper in the southwestern USA due to acute drought stress".Forest Ecology and Management 480(2021).