Borehole Equilibration: Testing a New Method to Monitor the Isotopic Composition of Tree Xylem Water in situ - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Frontiers in Plant Science Year : 2020

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

John D Marshall
  • Function : Author
  • PersonId : 1077460
Matthias Cuntz
Matthias Beyer
  • Function : Author
Maren Dubbert
  • Function : Author
Kathrin Kuehnhammer
  • Function : Author

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.
Fichier principal
Vignette du fichier
marshall_et_al_frontiers_plant_sci_2020.pdf (1.02 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02942670 , version 1 (18-09-2020)

Licence

Attribution

Identifiers

Cite

John D Marshall, Matthias Cuntz, Matthias Beyer, Maren Dubbert, Kathrin Kuehnhammer. Borehole Equilibration: Testing a New Method to Monitor the Isotopic Composition of Tree Xylem Water in situ. Frontiers in Plant Science, 2020, 11, pp.358. ⟨10.3389/fpls.2020.00358⟩. ⟨hal-02942670⟩
51 View
106 Download

Altmetric

Share

Gmail Facebook X LinkedIn More