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BG | Articles | Volume 17, issue 19
Biogeosciences, 17, 4853–4870, 2020
https://doi.org/10.5194/bg-17-4853-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 17, 4853–4870, 2020
https://doi.org/10.5194/bg-17-4853-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Oct 2020

Research article | 13 Oct 2020

Causes and consequences of pronounced variation in the isotope composition of plant xylem water

Hannes P. T. De Deurwaerder et al.

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Araguás-Araguás, L., Froehlich, K., and Rozanski, K.: Stable isotope composition of precipitation over southeast Asia, J. Geophys. Res.-Atmos., 103, 28721–28742, https://doi.org/10.1029/98JD02582, 1998. 
Azzalini, A.: The skew-normal and related families, Cambridge University Press, 3, 261 pp., 2013. 
Barbeta, A., Gimeno, T. E., Clavé, L., Fréjaville, B., Jones, S. P., Delvigne, C., Wingate, L., and Ogée, J.: An explanation for the isotopic offset between soil and stem water in a temperate tree species, New Phytol., 227, 766–779, https://doi.org/10.1111/nph.16564, 2020. 
Barnard, R. L., De Bello, F., Gilgen, A. K., and Buchmann, N.: The δ18O of root crown water best reflects source water δ18O in different types of herbaceous species, Rapid Commun. Mass Sp., 20, 3799–3802, https://doi.org/10.1002/rcm.2778, 2006. 
Brinkmann, N., Eugster, W., Buchmann, N., and Kahmen, A.: Species-specific differences in water uptake depth of mature temperate trees vary with water availability in the soil, Plant Biol., 21, 71–81, https://doi.org/10.1111/plb.12907, 2019. 
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The depths at which plants take up water is challenging to observe directly. To do so, scientists have relied on measuring the isotopic composition of xylem water as this provides information on the water’s source. Our work shows that this isotopic composition changes throughout the day, which complicates the interpretation of the water’s source and has been currently overlooked. We build a model to help understand the origin of these composition changes and their consequences for science.
The depths at which plants take up water is challenging to observe directly. To do so,...
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