Articles | Volume 24, issue 8
https://doi.org/10.5194/hess-24-4045-2020
https://doi.org/10.5194/hess-24-4045-2020
Research article
 | 
20 Aug 2020
Research article |  | 20 Aug 2020

A combination of soil water extraction methods quantifies the isotopic mixing of waters held at separate tensions in soil

William H. Bowers, Jason J. Mercer, Mark S. Pleasants, and David G. Williams

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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 while extraction method influences their measurement, Hydrol. Process., 34, 991–1003, https://doi.org/10.1002/hyp.13633, 2019. 
Allison, G. B., Barnes, C. J., and Hughes, M. W.: The distribution of deuterium and 18O in dry soils 2. Experimental, J. Hydrol., 64, 377–397, https://doi.org/10.1016/0022-1694(83)90078-1, 1983. 
Barnes, C. J. and Allison, G. B.: Tracing of water movement in the unsaturated zone using stable isotopes of hydrogen and oxygen, J. Hydrol., 100, 143–176, https://doi.org/10.1016/0022-1694(88)90184-9, 1988. 
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. 
Bowers, W. and Mercer, J.: Combination of soil water extraction methods quantifies isotopic mixing of waters held at separate tensions in soil [data files and R code], Open Science Framework, https://doi.org/10.17605/OSF.IO/ET3G5 2020. 
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Short summary
Determining the chemical composition of soil water can help to address questions concerning water transport and use. However, there are many observations of incompletely mixed soil water within various soil pore domains. We applied two contrasting waters to soil samples and then removed water from the soils with three sequential and increasing applied energy steps to assess soil water mixing and equilibration over time. We found it took more than 3 d for soil water to mix and equilibrate.