Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US

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dc.contributor.authorLin, Jiajiaen
dc.contributor.authorCompton, Jana E.en
dc.contributor.authorLeibowitz, Scott G.en
dc.contributor.authorMueller-Warrant, Georgeen
dc.contributor.authorMatthews, Williamen
dc.contributor.authorSchoenholtz, Stephen H.en
dc.contributor.authorEvans, Daniel M.en
dc.contributor.authorCoulombe, Rob A.en
dc.contributor.departmentVirginia Water Resources Research Centeren
dc.date.accessioned2020-03-09T12:41:49Zen
dc.date.available2020-03-09T12:41:49Zen
dc.date.issued2018-12-19en
dc.description.abstractWe constructed a seasonal nitrogen (N) budget for the year 2008 in the Calapooia River Watershed (CRW), an agriculturally dominated tributary of the Willamette River (Oregon, U.S.) under Mediterranean climate. Synthetic fertilizer application to agricultural land (dominated by grass seed crops) was the source of 90% of total N input to the CRW. Over 70% of the stream N export occurred during the wet winter, the primary time of fertilization and precipitation, and the lowest export occurred in the dry summer. Averaging across all 58 tributary subwatersheds, 19% of annual N inputs were exported by streams, and 41% by crop harvest. Regression analysis of seasonal stream export showed that winter fertilization was associated with 60% of the spatial variation in winter stream export, and this fertilizer continued to affect N export in later seasons. Annual N inputs were highly correlated with crop harvest N (r(2)=0.98), however, seasonal dynamics in N inputs and losses produced relatively low overall nitrogen use efficiency (41%), suggesting that hydrologic factors may constrain improvements in nutrient management. The peak stream N export during fall and early winter creates challenges to reducing N losses to groundwater and surface waters. Construction of a seasonal N budget illustrated that the period of greatest N loss is disconnected from the period of greatest crop N uptake. Management practices that serve to reduce the N remaining in the system at the end of the growing season and prior to the fall and winter rains should be explored to reduce stream N export.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1007/s10533-018-0532-0en
dc.identifier.eissn1573-515Xen
dc.identifier.issn0168-2563en
dc.identifier.issue2en
dc.identifier.urihttp://hdl.handle.net/10919/97257en
dc.identifier.volume142en
dc.language.isoenen
dc.rightsCreative Commons CC0 1.0 Universal Public Domain Dedicationen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectAgricultureen
dc.subjectGISen
dc.subjectNutrient use efficiencyen
dc.subjectGrass seed cropsen
dc.subjectSeasonal analysisen
dc.subjectWater qualityen
dc.subjectNitrogenen
dc.titleSeasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, USen
dc.title.serialBiogeochemistryen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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