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Borehole Equilibration: Testing a New Method to Monitor the Isotopic Composition of Tree Xylem Water in situ

Marshall, John D and Cuntz, Matthias and Dubbert, Maren and Kuehnhammer, Kathrin (2020). Borehole Equilibration: Testing a New Method to Monitor the Isotopic Composition of Tree Xylem Water in situ. Frontiers in Plant Science. 11 , 358 , 1-14
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Abstract

Forest water use has been difficult to quantify. One promising approach is to measure the isotopic composition of plant water, e.g., the transpired water vapor or xylem water. Because different water sources, e.g., groundwater versus shallow soil water, often show different isotopic signatures, isotopes can be used to investigate the depths from which plants take up their water and how this changes over time. Traditionally such measurements have relied on the extraction of wood samples, which provide limited time resolution at great expense, and risk possible artifacts. Utilizing a borehole drilled through a tree's stem, we propose a new method based on the notion that water vapor in a slow-moving airstream approaches isotopic equilibration with the much greater mass of liquid water in the xylem. We present two empirical data sets showing that the method can work in practice. We then present a theoretical model estimating equilibration times and exploring the limits at which the approach will fail. The method provides a simple, cheap, and accurate means of continuously estimating the isotopic composition of the source water for transpiration.

Authors/Creators:Marshall, John D and Cuntz, Matthias and Dubbert, Maren and Kuehnhammer, Kathrin
Title:Borehole Equilibration: Testing a New Method to Monitor the Isotopic Composition of Tree Xylem Water in situ
Year of publishing :2020
Volume:11
Article number:358
Number of Pages:14
Publisher:Frontiers
ISSN:1664-462X
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:transpiration, continuous sampling, root water uptake, Craig-Gordon model, delta O-18, delta H-2, isotopic labeling, xylem water
URN:NBN:urn:nbn:se:slu:epsilon-p-105774
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105774
Additional ID:
Type of IDID
DOI10.3389/fpls.2020.00358
Web of Science (WoS)000531236300001
ID Code:17111
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:22 Jun 2020 13:33
Metadata Last Modified:22 Jun 2020 13:33

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