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.
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
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133065
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]. Forest Ecology and Management,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.,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".458(2020).