Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/acs.est.6b01057
Titel (primär) Discharge driven nitrogen dynamics in a mesoscale river basin as constrained by stable isotope patterns
Autor Mueller, C.; Zink, M.; Samaniego, L. ORCID logo ; Krieg, R.; Merz, R.; Rode, M.; Knöller, K.
Quelle Environmental Science & Technology
Erscheinungsjahr 2016
Department ASAM; CHS; CATHYD
Band/Volume 50
Heft 17
Seite von 9187
Seite bis 9196
Sprache englisch
UFZ Querschnittsthemen 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.
dauerhafte UFZ-Verlinkung
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 10.1021/acs.est.6b01057