气候变化领域集成服务门户(CCPortal): Patterns, drivers, and implications of postfire delayed tree mortality in temperate conifer forests of the western United States

CCPortal

DOI	10.1002/ecs2.4805
	Patterns, drivers, and implications of postfire delayed tree mortality in temperate conifer forests of the western United States
	Busby, Sebastian; Evers, Cody; Holz, Andres
发表日期	2024
ISSN	2150-8925
起始页码	15
结束页码	4
卷号	15 期号:4
英文摘要	Conifer forest resilience may be threatened by increasing wildfire activity and compound disturbances in western North America. Fire refugia enhance forest resilience, yet may decline over time due to delayed mortality-a process that remains poorly understood at landscape and regional scales. To address this uncertainty, we used high-resolution satellite imagery (5-m pixel) to map and quantify delayed mortality of conifer tree cover between 1 and 5 years postfire, across 30 large wildfires that burned within three montane ecoregions in the western United States. We used statistical models to explore the influence of burn severity, topography, soils, and climate moisture deficit on delayed mortality. We estimate that delayed mortality reduced live conifer tree cover by 5%-25% at the fire perimeter scale and 12%-15% at the ecoregion scale. Remotely sensed burn severity (1-year postfire) was the strongest predictor of delayed mortality, indicating patch-level fire effects are a strong proxy for fire injury severity among surviving trees that eventually perish. Delayed mortality rates were further influenced by long-term average and short-term postfire climate moisture deficits, illustrating the impact of drought on fire-injured tree survival. Our work demonstrates that delayed mortality in conifer forests of the western United States can be remotely quantified at a fine grain and landscape scale, is a spatially extensive phenomenon, is driven by fire-climate-environment interactions, and has important ecological implications.
英文关键词	burn severity; delayed mortality; fire effects; fire refugia; forest resilience; remote sensing; temperate conifer forests; western United States
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001200555000001
来源期刊	ECOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/299995
作者单位	Portland State University; Portland State University
推荐引用方式 GB/T 7714	Busby, Sebastian,Evers, Cody,Holz, Andres. Patterns, drivers, and implications of postfire delayed tree mortality in temperate conifer forests of the western United States[J],2024,15(4).
APA	Busby, Sebastian,Evers, Cody,&Holz, Andres.(2024).Patterns, drivers, and implications of postfire delayed tree mortality in temperate conifer forests of the western United States.ECOSPHERE,15(4).
MLA	Busby, Sebastian,et al."Patterns, drivers, and implications of postfire delayed tree mortality in temperate conifer forests of the western United States".ECOSPHERE 15.4(2024).