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Title (Primary) Discharge driven nitrogen dynamics in a mesoscale river basin as constrained by stable isotope patterns
Author Mueller, C.; Zink, M.; Samaniego, L.; Krieg, R.; Merz, R.; Rode, M.; Knöller, K.;
Journal Environmental Science & Technology
Year 2016
Department ASAM; CHS; CATHYD;
Volume 50
Issue 17
Language englisch;
POF III (all) T34; T53;
UFZ wide themes RU2
Abstract Nitrate loads and corresponding dual-isotope signatures were used to evaluate large scale N dynamics and trends in a river catchment with a strong anthropogenic gradient (forest conservation areas in the mountainous region, and intensively agricultural use in the lowlands). The Bode River catchment with an area of 3200 km2 in the Harz Mountains and central German lowlands was investigated by a two years monitoring program including 133 water sampling points each representing a sub-catchment. Based on discharge data either observed or simulated by the mesoscale Hydrological Model (mhM) a load based interpretation of hydrochemical and isotope data was conducted. Nitrate isotopic signatures in the entire catchment are controlled by (I) the contribution of different nitrogen sources, (II) by variable environmental conditions during the formation of nitrate, and (III) by a minor impact of denitrification. For major tributaries, a relationship between discharge and nitrate isotopic signatures is observed. This may in part be due to the fact that during periods of higher hydrologic activity a higher wash out of isotopically lighter nitrate formed by bacterial nitrification processes of reduced or organic soil nitrogen occurs. Beyond that, in-stream denitrification seems to be more intense during periods of low flow.
ID 17720
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17720
Mueller, C., Zink, M., Samaniego, L., Krieg, R., Merz, R., Rode, M., Knöller, K. (2016):
Discharge driven nitrogen dynamics in a mesoscale river basin as constrained by stable isotope patterns
Environ. Sci. Technol. 50 (17), 9187 - 9196