Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1029/2020WR028134
Lizenz creative commons licence
Titel (primär) Archetypes and controls of riverine nutrient export across German catchments
Autor Ebeling, P.; Kumar, R. ORCID logo ; Weber, M.; Knoll, L.; Fleckenstein, J.H.; Musolff, A.
Quelle Water Resources Research
Erscheinungsjahr 2021
Department CHS; HDG
Band/Volume 57
Heft 4
Seite von e2020WR028134
Sprache englisch
Topic T5 Future Landscapes
Keywords water quality; nutrients; controls; catchments; concentration‐discharge relationships
Abstract Elevated nutrient inputs challenge the health and functioning of aquatic ecosystems. To improve riverine water quality management, it is necessary to understand the underlying biogeochemical and physical processes, anthropogenic drivers and their interactions at catchment scale. We hypothesize that the spatial heterogeneity of nutrient sources dominantly controls the variability of in‐stream concentration dynamics among catchments. We investigated controls of mean nitrate (NO3), phosphate (PO43‐), and total organic carbon (TOC) concentrations and concentration‐discharge (C‐Q) relationships in 787 German catchments of a newly assembled data base, covering a wide range of physiographic and anthropogenic settings. We linked water quality metrics to catchment characteristics using partial least square regressions and random forests. We found archetypal C‐Q patterns with enrichment dominating NO3 and TOC, and dilution dominating PO43‐ export. Both the mean NO3 concentrations and their variance among sites increased with agricultural land use. We argue that subsurface denitrification can buffer high N‐inputs and cause a decline in concentration with depth, resulting in chemodynamic, strongly positive C‐Q patterns. Mean PO43‐ concentrations were related to point sources, though the low predictive power suggests effects of unaccounted in‐stream processes. In contrast, high diffuse agricultural inputs explained observed positive PO43‐ C‐Q patterns. TOC levels were positively linked to the abundance of riparian wetlands, while hydrological descriptors were important for explaining TOC dynamics. Our study shows a strong modulation of anthropogenic inputs by natural controls for NO3 and PO43‐ concentrations and dynamics, while for TOC only natural controls dominate observed patterns across Germany.
dauerhafte UFZ-Verlinkung
Ebeling, P., Kumar, R., Weber, M., Knoll, L., Fleckenstein, J.H., Musolff, A. (2021):
Archetypes and controls of riverine nutrient export across German catchments
Water Resour. Res. 57 (4), e2020WR028134 10.1029/2020WR028134