Nitrate isotopes reveal N-cycled waters in a spring-fed agricultural catchment

dc.creatorMATIATOS, IOANNIS
dc.creatorARAGUAS-ARAGUAS, LUIS
dc.creatorWASSENAAR, LEONARD I.
dc.creatorMONTEIRO, LUCILENA R.
dc.creatorHARJUNG, ASTRID
dc.creatorDOUENCE, CEDRIC
dc.creatorKRALIK, MARTIN
dc.date2023
dc.date2023-04-26T18:29:31Z
dc.date2023-04-26T18:29:31Z
dc.date.accessioned2023-09-28T14:25:51Z
dc.date.available2023-09-28T14:25:51Z
dc.identifier1025-6016
dc.identifierhttp://repositorio.ipen.br/handle/123456789/34010
dc.identifier1
dc.identifier59
dc.identifier10.1080/10256016.2022.2157412
dc.identifier0000-0002-4457-4925
dc.identifier11.4
dc.identifier42
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9004219
dc.descriptionNitrate stable isotopes provide information about nitrate contamination and cycling by microbial processes. The Fischa-Dagnitz (Austria) spring and river system in the agricultural catchment of the Vienna basin shows minor annual variance in nitrate concentrations. We measured nitrate isotopes (??15N, ??18O) in the source spring and river up to the confluence with the Danube River (2019???2020) with chemical and water isotopes to assess mixing and nitrate transformation processes. The Fischa-Dagnitz spring showed almost stable nitrate concentration (3.3????????1.0???mg/l as NO3???-N) year-round but surprisingly variable ??15N, ??18O-NO3??? values ranging from +5.5 to +11.1??? and from +0.5 to +8.1???, respectively. The higher nitrate isotope values in summer were attributed to release of older denitrified water from the spring whose isotope signal was dampened downstream by mixing. A mixing model suggested denitrified groundwater contributed???>???50 % of spring discharge at baseflow conditions. The isotopic composition of NO3??? in the gaining streams was partly controlled by nitrification during autumn and winter months and assimilation during the growing season resulting in low and high ??15N-NO3??? values, respectively. NO3??? isotope variation helped disentangle denitrified groundwater inputs and biochemical cycling processes despite minor variation of NO3??? concentration.
dc.format27-47
dc.relationIsotopes in Environmental and Health Studies
dc.rightsopenAccess
dc.subjectagriculture
dc.subjectbiogeochemistry
dc.subjectdenitrification
dc.subjectground water
dc.subjectmixing
dc.subjecthydrology
dc.subjectisotopes
dc.subjectnitrogen 15
dc.subjectnitrates
dc.subjectoxygen 18
dc.titleNitrate isotopes reveal N-cycled waters in a spring-fed agricultural catchment
dc.typeArtigo de peri??dico
dc.coverageI


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