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Riparian groundwater nitrogen (N) isotopes reveal human imprints of dams and road salt salinization

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Created:	Feb 02, 2024 at 8:26 p.m.
Last updated:	Feb 05, 2024 at 3:51 p.m.
DOI:	10.4211/hs.5d326d1f18aa40738bf8bd7ec6e65eb9
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Abstract

Groundwater nitrate-N isotopes (δ15N-NO3-) have been used to infer the effects of natural and anthropogenic change on N cycle processes in the environment. Here we report unexpected changes in groundwater δ15N-NO3- for riparian zones affected by relict milldams and salinization. Contrary to natural conditions, groundwater δ15N-NO3- values declined from the upland edge through the riparian zone and were lowest near the stream. Groundwater δ15N-NO3- values increased for low electron donor (dissolved organic carbon and iron) to acceptor (NO3-) ratios but decreased beyond a specific change point. Groundwater δ15N-NO3- values were particularly low for the riparian milldam site subjected to road-salt salinization. We attributed these N isotopic trends to suppression of denitrification, occurrence of dissimilatory nitrate reduction to ammonium (DNRA), and/or road salt salinization. Groundwater δ15N-NO3- can provide valuable insights into process mechanisms and can serve as “imprints” of anthropogenic activities and legacies.

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Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
National Science Foundation	Hydrologic Sciences grant	#1929747 and # 2213855.

How to Cite

Inamdar, S., M. Peipoch, M. Sena, B. Joshi, M. M. Rahman, J. Kan, E. K. Peck, A. Gold, T. L. E. Trammell, P. M. Groffman (2024). Riparian groundwater nitrogen (N) isotopes reveal human imprints of dams and road salt salinization, HydroShare, https://doi.org/10.4211/hs.5d326d1f18aa40738bf8bd7ec6e65eb9

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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