气候变化领域集成服务门户(CCPortal): Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage

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DOI	10.1016/j.foreco.2019.117647
	Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage
	Hart J.; O'Keefe K.; Augustine S.P.; McCulloh K.A.
发表日期	2020
ISSN	0378-1127
卷号	458
英文摘要	Loblolly pine (Pinus taeda L.) has gradually replaced longleaf pine (P. palustris Mill.) across much of the coastal southeastern United States. Given recent interest in the regeneration of longleaf pine ecosystems, understanding how these two species will respond to drier conditions associated with climate change will be critically important. We conducted a progressive water-stress experiment on germinants of P. palustris and P. taeda over the course of 9 weeks, measuring gas exchange, allometry, water relations, and tracheid anatomy. P. palustris developed more overall biomass, had wider tracheids, allocated more of its biomass into leaf tissue, and maintained a narrower safety margin against hydraulic failure than P. taeda. Both species reduced leaf gas exchange as water stress increased, though P. palustris experienced earlier and greater declines in photosynthetic rates than P. taeda. The greater aboveground growth and narrower hydraulic safety margin observed in P. palustris represents a trade-off between growth and hydraulic safety and is likely related to the species’ defensive strategy against fire. We suggest that this trade-off may limit P. palustris germinant regeneration on sandier, xeric sites as climate change intensifies. © 2019 Elsevier B.V.
英文关键词	Drought; Hydraulic safety margins; Leaf gas exchange; Longleaf pine savanna; P. taeda; Pinus palustris; Restoration
语种	英语
scopus关键词	Biology; Climate change; Drought; Economic and social effects; Forestry; Image reconstruction; Physiological models; Leaf gas exchange; Longleaf pine; P. taeda; Pinus palustris; Safety margin; Ecology; climate change; coniferous tree; drought stress; gas exchange; hydraulic conductivity; leaf; physiological response; restoration ecology; savanna; trade-off; water stress; Biology; Drought; Ecology; Forestry; Pinus Palustris; Pinus Taeda; Stresses; Water; United States; Pinus palustris; Pinus taeda
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/155529
作者单位	Department of Botany, University of Wisconsin – Madison, Madison, WI 53706, United States
推荐引用方式 GB/T 7714	Hart J.,O'Keefe K.,Augustine S.P.,et al. Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage[J],2020,458.
APA	Hart J.,O'Keefe K.,Augustine S.P.,&McCulloh K.A..(2020).Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage.Forest Ecology and Management,458.
MLA	Hart J.,et al."Physiological responses of germinant Pinus palustris and P. taeda seedlings to water stress and the significance of the grass-stage".Forest Ecology and Management 458(2020).