气候变化领域集成服务门户(CCPortal): Landscape position mediates drought vulnerability in California valley oak (Quercus lobata)

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DOI	10.1088/1748-9326/ad3461
	Landscape position mediates drought vulnerability in California valley oak (Quercus lobata)
	Trumper, Matthew L.; Griffin, Daniel; White, Michael D.
发表日期	2024
ISSN	1748-9326
起始页码	19
结束页码	4
卷号	19 期号:4
英文摘要	Future climate change will exacerbate drought stress in water-limited ecosystems. However, topography can alter the fine-scale climatic and hydrologic conditions that mediate plant response to meteorological drought. Here, with six new valley oak (Quercus lobata) tree-ring width chronologies, we assess how topography acts as a mediating factor on tree growth and drought sensitivity. Because valley oaks are known to be highly dependent on subsurface water, we predicted that trees growing in riparian sites would be less sensitive to precipitation variability due to greater access to groundwater. Trees were sampled in the Tehachapi Mountains of California across a landscape gradient of sites ranging from 375-1650 m elevation and across upland (55-69 m mean height above nearest drainage) and riparian (2-6 m mean height above the nearest drainage) hillslope positions. Interannual tree growth patterns and drought sensitivity varied substantially in association with hillslope position and elevation. Valley oak radial growth showed a consistently weaker response to precipitation at riparian sites. The influence of hillslope position on drought sensitivity varied with elevation, such that the riparian buffering effect was weakest at sites higher in the watershed and strengthened, progressively, toward the lower elevation sites with greater climatic water deficit. Upland tree growth exhibited a strong response to high-frequency interannual precipitation variability at the high elevation site, whereas trees at lower elevation upland sites responded more to low-frequency decadal trends in precipitation, possibly reflecting hydrogeological processes by which precipitation feeds groundwater lower in the watershed. Our results are consistent with groundwater-dependence of valley oak and indicate that riparian habitats are the most likely refugia for the species during prolonged drought.
英文关键词	climate change; dendrochronology; hydrologic refugia; topography; groundwater; hillslope position; topoclimate
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001191115900001
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289621
作者单位	University of Minnesota System; University of Minnesota Twin Cities; University of Minnesota System; University of Minnesota Twin Cities; California State University System; San Diego State University
推荐引用方式 GB/T 7714	Trumper, Matthew L.,Griffin, Daniel,White, Michael D.. Landscape position mediates drought vulnerability in California valley oak (Quercus lobata)[J],2024,19(4).
APA	Trumper, Matthew L.,Griffin, Daniel,&White, Michael D..(2024).Landscape position mediates drought vulnerability in California valley oak (Quercus lobata).ENVIRONMENTAL RESEARCH LETTERS,19(4).
MLA	Trumper, Matthew L.,et al."Landscape position mediates drought vulnerability in California valley oak (Quercus lobata)".ENVIRONMENTAL RESEARCH LETTERS 19.4(2024).