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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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.