Articles | Volume 25, issue 7
Hydrol. Earth Syst. Sci., 25, 3975–3989, 2021
https://doi.org/10.5194/hess-25-3975-2021

Special issue: Water, isotope and solute fluxes in the soil–plant–atmosphere...

Hydrol. Earth Syst. Sci., 25, 3975–3989, 2021
https://doi.org/10.5194/hess-25-3975-2021

Research article 08 Jul 2021

Research article | 08 Jul 2021

Insights into the isotopic mismatch between bulk soil water and Salix matsudana Koidz trunk water from root water stable isotope measurements

Ying Zhao and Li Wang

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Subject: Ecohydrology | Techniques and Approaches: Instruments and observation techniques
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Cited articles

Adams, R. E., Hyodo, A., SantaMaria, T., Wright, C. L., Boutton, T. W., and West, J. B.: Bound and mobile soil water isotope ratios are affected by soil texture and mineralogy, whereas extraction method influences their measurement, Hydrol. Process., 34, 991–1003, 2020. 
Allen, S. T., Kirchner, J. W., Braun, S., Siegwolf, R. T. W., and Goldsmith, G. R.: Seasonal origins of soil water used by trees, Hydrol. Earth Syst. Sci., 23, 1199–1210, https://doi.org/10.5194/hess-23-1199-2019, 2019. 
Barbeta, A., Jones, S. P., Clavé, L., Wingate, L., Gimeno, T. E., Fréjaville, B., Wohl, S., and Ogée, J.: Unexplained hydrogen isotope offsets complicate the identification and quantification of tree water sources in a riparian forest, Hydrol. Earth Syst. Sci., 23, 2129–2146, https://doi.org/10.5194/hess-23-2129-2019, 2019. 
Barbeta, A., Gimeno, T. E., Clave, L., Frejaville, B., Jones, S. P., Delvigne, C., Wingate, L., and Ogee, J. M.: An explanation for the isotopic offset between soil and stem water in a temperate tree species, New Phytol., 227, 766–779, 2020. 
Bowen, G. J., Cai, Z. Y., Fiorella, R. P., and Putman, A. L.: Isotopes in the water cycle: regional- to global-scale patterns and applications, Annu. Rev. Earth Pl. Sci., 47, 453–479, 2019. 
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Short summary
At our study site during the experimental period, trunk water was only isotopically similar to root water at 100–160 cm depths. The isotopic composition of root water deviated from that of bulk soil water but overlapped with the composition derived for less mobile water. These findings suggest that the isotopic offset between bulk soil water and trunk water was due to the isotopic mismatch between root water and bulk soil water associated with soil water heterogeneity.