Articles | Volume 27, issue 18
https://doi.org/10.5194/hess-27-3393-2023
https://doi.org/10.5194/hess-27-3393-2023
Research article
 | 
22 Sep 2023
Research article |  | 22 Sep 2023

Dye-tracer-aided investigation of xylem water transport velocity distributions

Stefan Seeger and Markus Weiler

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Revised manuscript accepted for HESS
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Cited articles

Baker, H. and James, W. O.: The Behaviour of Dyes in the Transpiration Stream of Sycamores (Acer Pseudoplatanus L.), New Phytol., 32, 245–260, https://doi.org/10.1111/j.1469-8137.1933.tb07010.x, 1933. a, b
Barbeta, A., Burlett, R., Martín-Gómez, P., Fréjaville, B., Devert, N., Wingate, L., Domec, J.-C., and Ogée, J.: Evidence for Distinct Isotopic Compositions of Sap and Tissue Water in Tree Stems: Consequences for Plant Water Source Identification, New Phytol., 233, 1121–1132, https://doi.org/10.1111/nph.17857, 2022. a
Berry, Z. C., Evaristo, J., Moore, G., Poca, M., Steppe, K., Verrot, L., Asbjornsen, H., Borma, L. S., Bretfeld, M., Hervé-Fernández, P., Seyfried, M., Schwendenmann, L., Sinacore, K., De Wispelaere, L., and McDonnell, J.: The Two Water Worlds Hypothesis: Addressing Multiple Working Hypotheses and Proposing a Way Forward, Ecohydrology, 11, e1843, https://doi.org/10.1002/eco.1843, 2018. a
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. a
Čermák, J., Kučera, J., and Nadezhdina, N.: Sap Flow Measurements with Some Thermodynamic Methods, Flow Integration within Trees and Scaling up from Sample Trees to Entire Forest Stands, Trees, 18, 529–546, https://doi.org/10.1007/s00468-004-0339-6, 2004. a
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Short summary
This study proposes a low-budget method to quantify the radial distribution of water transport velocities within trees at a high spatial resolution. We observed a wide spread of water transport velocities within a tree stem section, which were on average 3 times faster than the flux velocity. The distribution of transport velocities has implications for studies that use water isotopic signatures to study root water uptake and usually assume uniform or even implicitly infinite velocities.
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