气候变化领域集成服务门户(CCPortal): Rapid hydraulic collapse as cause of drought-induced mortality in conifers

CCPortal

DOI	10.1073/pnas.2025251118
	Rapid hydraulic collapse as cause of drought-induced mortality in conifers
	Arend M.; Link R.M.; Patthey R.; Hoch G.; Schuldt B.; Kahmen A.
发表日期	2021
ISSN	00278424
卷号	118 期号:16
英文摘要	Understanding the vulnerability of trees to drought-induced mortality is key to predicting the fate of forests in a future climate with more frequent and intense droughts, although the underlying mechanisms are difficult to study in adult trees. Here, we explored the dynamic changes of water relations and limits of hydraulic function in dying adults of Norway spruce (Picea abies L.) during the progression of the record-breaking 2018 Central European drought. In trees on the trajectory to drought-induced mortality, we observed rapid, nonlinear declines of xylem pressure that commenced at the early onset of xylem cavitation and caused a complete loss of xylem hydraulic conductance within a very short time. We also observed severe depletions of nonstructural carbohydrates, though carbon starvation could be ruled out as the cause of the observed tree death, as both dying and surviving trees showed these metabolic limitations. Our observations provide striking field-based evidence for fast dehydration and hydraulic collapse as the cause of drought-induced mortality in adult Norway spruce. The nonlinear decline of tree water relations suggests that considering the temporal dynamics of dehydration is critical for predicting tree death. The collapse of the hydraulic system within a short time demonstrates that trees can rapidly be pushed out of the zone of hydraulic safety during the progression of a severe drought. In summary, our findings point toward a higher mortality risk for Norway spruce than previously assumed, which is in line with current reports of unprecedented levels of drought-induced mortality in this major European tree species. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Drought; Hydraulic failure; Mortality; Trees
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179835
作者单位	Department of Environmental Sciences, University of Basel, Basel, 4056, Switzerland; Department of Botany II - Ecophysiology and Vegetation Ecology, Universität Würzburg, Würzburg, 97070, Germany
推荐引用方式 GB/T 7714	Arend M.,Link R.M.,Patthey R.,et al. Rapid hydraulic collapse as cause of drought-induced mortality in conifers[J],2021,118(16).
APA	Arend M.,Link R.M.,Patthey R.,Hoch G.,Schuldt B.,&Kahmen A..(2021).Rapid hydraulic collapse as cause of drought-induced mortality in conifers.Proceedings of the National Academy of Sciences of the United States of America,118(16).
MLA	Arend M.,et al."Rapid hydraulic collapse as cause of drought-induced mortality in conifers".Proceedings of the National Academy of Sciences of the United States of America 118.16(2021).