Articles | Volume 27, issue 18
https://doi.org/10.5194/hess-27-3405-2023
https://doi.org/10.5194/hess-27-3405-2023
Research article
 | 
26 Sep 2023
Research article |  | 26 Sep 2023

Quantifying river water contributions to the transpiration of riparian trees along a losing river: lessons from stable isotopes and an iteration method

Yue Li, Ying Ma, Xianfang Song, Qian Zhang, and Lixin Wang

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Cited articles

Allen, C. D., Breshears, D. D., and McDowell, N. G.: On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene, Ecosphere, 6, 1-−55, https://doi.org/10.1890/ES15-00203.1, 2015. 
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. 
Alstad, K. P., Welker, J. M., Williams, S. A., and Trlica, M. J.: Carbon and water relations of Salix monticola in response to winter browsing and changes in surface water hydrology: an isotopic study using delta C-13 and delta O-18, Oecologia, 120, 375–385, 1999. 
Aguilos, M., Stahl C., Burban, B., Hérault B., Courtois, E., Coste, S., Wagner, F., Ziegler, C., Takagi, K., and Bonal, D.: Interannual and seasonal variations in ecosystem transpiration and water use efficiency in a tropical rainforest, Forests, 10, 1−-20, https://doi.org/10.3390/f10010014, 2019. 
Antunes, C., Barradas, M. C. D., Zunzunegui, M., Vieira, S., Pereira, A., Anjos, A., Correia, O., Pereira, M. J., and Maguas, C.: Contrasting plant water-use responses to groundwater depth in coastal dune ecosystems, Funct. Ecol., 32, 1931–1943, 2018. 
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Short summary
We proposed an iteration method in combination with the MixSIAR model and water isotopes to quantify the river water contribution (RWC) to riparian deep-rooted trees nearby a losing river. River water can indirectly contribute by 20.3 % to water uptake of riparian trees. River recharged riparian groundwater rapidly with a short groundwater residence time (no more than 0.28 d). The RWC to riparian trees was negatively correlated with the water table depth and leaf δ13C in linear functions.
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