Articles | Volume 29, issue 13
https://doi.org/10.5194/hess-29-2765-2025
https://doi.org/10.5194/hess-29-2765-2025
Research article
 | 
03 Jul 2025
Research article |  | 03 Jul 2025

Nitrate-nitrogen dynamics in response to forestry harvesting and climate variability: 4 years of UV nitrate sensor data in a shallow gravel aquifer

Ben Wilkins, Tom Johns, and Sarah Mager

Related subject area

Subject: Groundwater hydrology | Techniques and Approaches: Theory development
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Cited articles

Abascal, E., Gómez-Coma, L., Ortiz, I., and Ortiz, A.: Global diagnosis of nitrate pollution in groundwater and review of removal technologies, Sci. Total Environ., 810, 152233, https://doi.org/10.1016/j.scitotenv.2021.152233, 2022. 
Abraham, P. and Hanson, C.: Groundwater quality investigation of the Culverden Basin. Environment Canterbury Regional Council Technical Report U06/33, https://api.ecan.govt.nz/TrimPublicAPI/documents/download/813687 (last access: 1 March 2024), 2006. 
Allen, R., Pereira, L., Raes, D., Smith, M.: Chapter 6-Etc-single crop coefficient (kc). Crop evapotranspiration guidelines for computing crop water requirements, FAO irrigation and drainage paper 56, https://www.fao.org/3/x0490e/x0490e00.htm (last access: 15 January 2024), 1998. 
Anaya, C. A., García-Oliva, F., and Jaramillo, V. J.: Rainfall and labile carbon availability control litter nitrogen dynamics in a tropical dry forest, Oecologia, 150, 602–610, https://doi.org/10.1007/s00442-006-0564-3, 2006. 
Argerich, A., Johnson, S. L., Sebestyen, S. D., Rhoades, C. C., Greathouse, E., Knoepp, J. D., Adams, M. B., Likens, G. E., Campbell, J. L., McDowell, W. H., Scatena, F. N., and Ice, G. G.: Trends in stream nitrogen concentrations for forested reference catchments across the USA, Environ. Res. Lett., 8, 014039, https://doi.org/10.1088/1748-9326/8/1/014039, 2013. 
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Short summary
We measured nitrate-nitrogen concentrations using a UV nitrate sensor over 4 years in a shallow gravel aquifer. We observed pulses of nitrate nitrogen in response to forestry harvesting during subsequent rainfall recharge. Our novel hysteresis analysis helped elucidate event-scale nitrate-nitrogen dynamics, while integrating continuous data improved nitrate-nitrogen load estimates. This research provides new insights into the variability of nitrate nitrogen in permeable aquifers.
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