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| Titel |
Riparian zone hydrology and soil water total organic carbon (TOC): implications for spatial variability and upscaling of lateral riparian TOC exports |
| VerfasserIn |
T. Grabs, K. Bishop, H. Laudon, S. W. Lyon, J. Seibert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-10), S.3901-3916 |
| Datensatznummer |
250007327
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| Publikation (Nr.) |
 copernicus.org/bg-9-3901-2012.pdf |
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| Zusammenfassung |
| Groundwater flowing from hillslopes through riparian (near-stream) soils
often undergoes chemical transformations that can substantially influence
stream water chemistry. We used landscape analysis to predict total organic
carbon (TOC) concentration profiles and groundwater levels measured in the
riparian zone (RZ) of a 67 km2 catchment in Sweden. TOC exported
laterally from 13 riparian soil profiles was then estimated based on the
riparian flow–concentration integration model (RIM). Much of the observed
spatial variability of riparian TOC concentrations in this system could be
predicted from groundwater levels and the topographic wetness index (TWI).
Organic riparian peat soils in forested areas emerged as hotspots exporting
large amounts of TOC. These TOC fluxes were subject to considerable temporal
variations caused by a combination of variable flow conditions and changing
soil water TOC concentrations. Mineral riparian gley soils, on the other
hand, were related to rather small TOC export rates and were characterized
by relatively time-invariant TOC concentration profiles. Organic and mineral
soils in RZs constitute a heterogeneous landscape mosaic that potentially
controls much of the spatial variability of stream water TOC. We developed
an empirical regression model based on the TWI to move beyond the plot scale
and to predict spatially variable riparian TOC concentration profiles for
RZs underlain by glacial till. |
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