Articles | Volume 23, issue 5
https://doi.org/10.5194/bg-23-2045-2026
https://doi.org/10.5194/bg-23-2045-2026
Research article
 | 
18 Mar 2026
Research article |  | 18 Mar 2026

Hydraulic Redistribution Decreases with Precipitation Magnitude and Frequency in a Dryland Ecosystem: A Data-Model Fusion Approach

Aneesh Kumar Chandel, Mitra Cattry, Yu Zhou, Hang Duong, Marcy E. Litvak, William T. Pockman, and Yiqi Luo

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Cited articles

Alfieri, J. G., Anderson, M. C., Kustas, W. P., and Cammalleri, C.: Effect of the revisit interval and temporal upscaling methods on the accuracy of remotely sensed evapotranspiration estimates, Hydrol. Earth Syst. Sci., 21, 83–98, https://doi.org/10.5194/hess-21-83-2017, 2017. 
Amenu, G. G. and Kumar, P.: A model for hydraulic redistribution incorporating coupled soil-root moisture transport, Hydrol. Earth Syst. Sci., 12, 55–74, https://doi.org/10.5194/hess-12-55-2008, 2008. 
Asadollahi, M., Nehemy, M. F., McDonnell, J. J., Rinaldo, A., and Benettin, P.: Toward a closure of catchment mass balance: Insight on the missing link from a vegetated lysimeter, Water Resour. Res., 58, e2021WR030698, https://doi.org/10.1029/2021WR030698, 2022. 
Barron-Gafford, G. A., Sanchez-Cañete, E. P., Minor, R. L., Hendryx, S. M., Lee, E., Sutter, L. F., Tran, N., Parra, E., Colella, T., Murphy, P. C., Hamerlynck, E. P., Kumar, P., and Scott, R. L.: Impacts of hydraulic redistribution on grass–tree competition vs facilitation in a semi and arid savanna, New Phytol., 215, 1451–1461, https://doi.org/10.1111/nph.14693, 2017. 
Barron-Gafford, G. A., Knowles, J. F., Sanchez-Cañete, E. P., Minor, R. L., Lee, E., Sutter, L., Tran, N., Murphy, P., Hamerlynck, E. P., Kumar, P., and Scott, R. L.: Hydraulic redistribution buffers climate variability and regulates grass-tree interactions in a semiarid riparian savanna, Ecohydrology, 14, e2271, https://doi.org/10.1002/eco.2271, 2021. 
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Short summary
Hydraulic redistribution (HR) is a passive process in which water can move between wet and dry regions in the root zone by flowing through plant root systems. In this modeling study, we showed that adding HR to a process-based model improved soil moisture predictions, particularly in the top 30 cm. HR rates declined with increasing rainfall magnitude and frequency, but HR rates were also influenced by the length of dry spells between rainfall events.
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