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Seasonal Disconnect Between Streamflow and Retention Shapes Riverine Nitrogen Export in the Willamette River Basin, Oregon

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Abstract

Watershed nutrient balance studies traditionally focus on annual fluxes. In areas with strongly seasonal, Mediterranean-type climate regimes, riverine nutrient export may be greater during wet seasons when hydrologic forcing overwhelms or bypasses retention mechanisms. By combining data on riverine export with spatially detailed nutrient inputs, we examine how nitrogen (N) supply, retention, and streamflow shape annual and seasonal riverine N export in Oregon’s Willamette River Basin (WRB). The WRB has pronounced dry summers and wet winters, and the distribution of farmland, cities and forests create significant spatial variations in N inputs. Local data on N inputs were coupled with streamflow and chemistry to calculate fractional N export for 22 WRB sub-watersheds in the mid-2000s. For the entire WRB, 78% of the N inputs came from agricultural activities, mainly as synthetic fertilizer (69%); the next largest inputs were deposition (10%), alder fixation (5%) and point sources (5%). Crop-specific estimates of fertilizer agreed with county fertilizer sales rates at the high end of extension recommendations. Fractional riverine N export (annual riverine N export / net watershed N inputs) averaged 38% of net inputs in WRB tributaries, greater than other regions of North America. Fall and winter together accounted for 60–90% of the riverine N export across all watersheds. Summer export was small but was greatest in the watersheds that receive seasonal snowmelt. Large wet season losses, when biotic sinks are less active, result in a relatively high proportion of N inputs exported in this region with a Mediterranean climate and high runoff.

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Acknowledgements

The authors thank Dan Wise and Hank Johnson of the USGS Oregon Water Science Center for sharing stream data and SPARROW results. We thank John Hart and Mark Mellbye, formerly of Oregon State University extension, and Susanna Pearlstein for guidance on crop fertilizer rates. We thank Jim Wigington, Scott Leibowitz and Lynne McWhorter for early discussions of the project and input on the study design. Philip Caruso and Jackie Brenner assisted in the crop fertilizer N input estimates, and George Mueller-Warrant provided the USDA-ARS crop data layer. Donna Schwede and Kristen Foley conducted the downscaled 4-km Community Multiscale Air Quality (CMAQ) modeling. We thank John Harrison and three anonymous reviewers for helpful feedback on the manuscript. The views expressed in this article are those of the authors and do not necessarily represent the views or policies of the US Environmental Protection Agency.

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Correspondence to Jana E. Compton.

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Author's Contributions

JEC conceived the study and drafted the manuscript. KEG and DJS were involved in the conception and design of the study, creation of the spatial input layers, interpretation of results and writing the manuscript. KEG conducted the stream and river load modeling. JL conducted the final input calculations and contributed to interpretation and writing the manuscript.

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Predicted concentrations and loads for the Willamette River at Portland, OR, USA (JPEG 841 kb)

10021_2019_383_MOESM3_ESM.jpg

Fractional export of total N from WRB sub-watersheds. Fractional export presented as the riverine export divided by the total N inputs for each sub-watershed (JPEG 574 kb)

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Compton, J.E., Goodwin, K.E., Sobota, D.J. et al. Seasonal Disconnect Between Streamflow and Retention Shapes Riverine Nitrogen Export in the Willamette River Basin, Oregon. Ecosystems 23, 1–17 (2020). https://doi.org/10.1007/s10021-019-00383-9

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