Abstract
Dissolved organic nitrogen (DON) can comprise a large and biologically important fraction of total dissolved N in surface water. Biotic and abiotic processes result in heterogeneous DON concentrations and bioavailability in soils, and as hydrologic connectivity expands and flow paths change in watersheds, novel sources of DON can be mobilized and transported to surface water. Although the relationship between in-stream DOC concentration and stream discharge has previously been examined in the literature, up to now there has not been a synthesis examining how DON concentrations, loads, and composition change during transitions from base flow to pulse flow conditions. We present a meta-analysis examining the effect of high flow on DON concentration ([DON]). The ratio of mean pulse flow [DON] to mean base flow [DON] (P:B) was calculated for individual events and averaged (geometric) within and then across sites to generate an overall effect size. For 47 sites (78 events), mean P:B was 1.58, which was significantly different from unity. This moderate increase in DON concentration contributed to over a more than 10-fold average increase in the rate of DON yield from base flow to high flow. The response of [DON] to high flow was significant in catchments where individual storm events or snowmelt runoff events were responsible for elevated flows, whereas the response was not significant in catchments where high discharge resulted from a mixture of upstream snowmelt and rain events. Additionally, an examination of DOC:DON ratios during high flow indicates that multiple sources of DON may be mobilized during high flow. Finally, current models of annual DON export may be improved by including a positive relationship between discharge and DON.
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Acknowledgments
We would like to thank Brian Pellerin for a friendly review, Cailin Huyck Orr and Kent Keller for helpful insights, and two anonymous reviewers for providing comments that greatly improved the manuscript. Additionally we thank Brian Pellerin (US Geological Survey), Dan Sobota, Paul Brooks (Sustainability of Semi-Arid Hydrology and Riparian Areas (SAHRA) STC, NSF award 9876800), Kevin Petrone (CSIRO), and Amy Townsend-Small for providing data. The NSIPIRE-IGERT program (NSF award 0903714) and a Washington State University Vancouver mini-grant provided funds for this work.
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Martin, R.A., Harrison, J.A. Effect of High Flow Events on In-Stream Dissolved Organic Nitrogen Concentration. Ecosystems 14, 1328–1338 (2011). https://doi.org/10.1007/s10021-011-9483-1
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DOI: https://doi.org/10.1007/s10021-011-9483-1