Articles | Volume 26, issue 13
https://doi.org/10.5194/hess-26-3573-2022
https://doi.org/10.5194/hess-26-3573-2022
Technical note
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08 Jul 2022
Technical note | Highlight paper |  | 08 Jul 2022

Technical note: Conservative storage of water vapour – practical in situ sampling of stable isotopes in tree stems

Ruth-Kristina Magh, Benjamin Gralher, Barbara Herbstritt, Angelika Kübert, Hyungwoo Lim, Tomas Lundmark, and John Marshall

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Cited articles

Allen, S. T. and Kirchner, J. W.: Potential effects of cryogenic extraction biases on plant water source partitioning inferred from xylem-water isotope ratios, Hydrol. Process., 36, e14483, https://doi.org/10.1002/hyp.14483, 2022. 
Bates, D., Mächler, M., Bolker, B., and Walker, S.: Fitting Linear Mixed-Effects Models Using lme4, J. Stat. Softw., 67, 1–48, https://doi.org/10.18637/jss.v067.i01, 2015. 
Beyer, M., Koeniger, P., Gaj, M., Hamutoko, J. T., Wanke, H., and Himmelsbach, T.: A deuterium-based labeling technique for the investigation of rooting depths, water uptake dynamics and unsaturated zone water transport in semiarid environments, J. Hydrol., 533, 627–643, https://doi.org/10.1016/j.jhydrol.2015.12.037, 2016. 
Beyer, M., Kühnhammer, K., and Dubbert, M.: In situ measurements of soil and plant water isotopes: A review of approaches, practical considerations and a vision for the future, Hydrol. Earth Syst. Sci., 24, 4413–4440, https://doi.org/10.5194/hess-24-4413-2020, 2020. 
Chen, Y., Helliker, B. R., Tang, X., Li, F., Zhou, Y., and Song, X.: Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water, P. Natl. Acad. Sci. USA, 117, 33345–33350, https://doi.org/10.1073/pnas.2014422117, 2020. 
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Executive editor
The authors present a new method to sample water vapour from trees in a cost-effective manner. The method can be applied in a lab, but also in the field. As many scientist are struggling with proper sampling method, I think this paper is worth highlighting.
Short summary
We developed a method of sampling and storing water vapour for isotope analysis, allowing us to infer plant water uptake depth. Measurements can be made at high temporal and spatial resolution even in remote areas. We ensured that all necessary components are easily available, making this method cost efficient and simple to implement. We found our method to perform well in the lab and in the field, enabling it to become a tool for everyone aiming to resolve questions regarding the water cycle.
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