Dye-tracer-aided investigation of xylem water transport velocity distributions
-
Published:2023-09-22
Issue:18
Volume:27
Page:3393-3404
-
ISSN:1607-7938
-
Container-title:Hydrology and Earth System Sciences
-
language:en
-
Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Seeger StefanORCID, Weiler MarkusORCID
Abstract
Abstract. The vast majority of studies investigating the source depths in the soil of root water uptake with the help of stable water isotopes implicitly assumes that the isotopic signatures of root water uptake and xylem water are identical. In this study we show that this basic assumption is not necessarily valid, since water transport within a plant's xylem is not instantaneous. However, to our knowledge, no study has yet tried to explicitly assess the distribution of water transport velocities within the xylem. With a dye tracer experiment, we were able to visualize how the transport of water through the xylem happens at a wide range of velocities which are distributed unequally throughout the xylem. In an additional virtual experiment we could show that, due to the unequal distribution of transport velocities throughout the xylem, different sampling approaches of stable water isotopes might effectively lead to xylem water samples with different underlying age distributions.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
Reference65 articles.
1. 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 2. 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 3. 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 4. 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 5. 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
|
|