气候变化领域集成服务门户(CCPortal): Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water

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DOI	10.1073/PNAS.2014422117
	Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water
	Chen Y.; Helliker B.R.; Tang X.; Li F.; Zhou Y.; Song X.
发表日期	2021
ISSN	00278424
起始页码	33345
结束页码	33350
卷号	117 期号:52
英文摘要	The hydrogen isotope ratio of water cryogenically extracted from plant stem samples (δ2Hstem_CVD) is routinely used to aid isotope applications that span hydrological, ecological, and paleoclimatological research. However, an increasing number of studies have shown that a key assumption of these applications—that δ2Hstem_CVD is equal to the δ2H of plant source water (δ2Hsource)—is not necessarily met in plants from various habitats. To examine this assumption, we purposedly designed an experimental system to allow independent measurements of δ2Hstem_CVD, δ2Hsource, and δ2H of water transported in xylem conduits (δ2Hxylem) under controlled conditions. Our measurements performed on nine woody plant species from diverse habitats revealed a consistent and significant depletion in δ2Hstem_CVD compared with both δ2Hsource and δ2Hxylem. Meanwhile, no significant discrepancy was observed between δ2Hsource and δ2Hxylem in any of the plants investigated. These results cast significant doubt on the long-standing view that deuterium fractionation occurs during root water uptake and, alternatively, suggest that measurement bias inherent in the cryogenic extraction method is the root cause of δ2Hstem_CVD depletion. We used a rehydration experiment to show that the stem water cryogenic extraction error could originate from a dynamic exchange between organically bound deuterium and liquid water during water extraction. In light of our finding, we suggest caution when partitioning plant water sources and reconstructing past climates using hydrogen isotopes, and carefully propose that the paradigm-shifting phenomenon of ecohydrological separation (“two water worlds”) is underpinned by an extraction artifact. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Cryogenic vacuum distillation; Deuterium isotope; Ecohydrological separation; Plant water uptake; Source water
语种	英语
scopus关键词	deuterium; hydrogen; deuterium; ground water; oxygen; water; Article; Atriplex; Avicennia marina; climate change; Eucalyptus; Ficus; nonhuman; plant root; plant stem; priority journal; soil analysis; species habitat; steady state; Tamarix chinensis; Taxodium; water cycle; water supply; water transport; woody plant; xylem; chemistry; cold; hydrology; plant; plant stem; time factor; Cold Temperature; Deuterium; Groundwater; Hydrogen; Hydrology; Oxygen Isotopes; Plant Stems; Plants; Time Factors; Water
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/179646
作者单位	College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China; Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, United States; Isotopomics in Chemical Biology, School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China; Shenzhen Key Laboratory of Marine Biological Resources and Ecological Environment, Shenzhen University, Shenzhen, 518060, China
推荐引用方式 GB/T 7714	Chen Y.,Helliker B.R.,Tang X.,et al. Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water[J],2021,117(52).
APA	Chen Y.,Helliker B.R.,Tang X.,Li F.,Zhou Y.,&Song X..(2021).Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	Chen Y.,et al."Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).