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Riparian zone hydrology and soil water total organic carbon (TOC)

implications for spatial variability and upscaling of lateral riparian TOC exports

Grabs, Thomas and Bishop, Kevin and Laudon, H. and Lyon, Steve W. and Seibert, Jan (2012). Riparian zone hydrology and soil water total organic carbon (TOC). Biogeosciences. 9:10, 3901-3916
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Official URL: http://dx.doi.org/10.5194/bg-9-3901-2012

Abstract

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.

Authors/Creators:Grabs, Thomas and Bishop, Kevin and Laudon, H. and Lyon, Steve W. and Seibert, Jan
Title:Riparian zone hydrology and soil water total organic carbon (TOC)
Subtitle:implications for spatial variability and upscaling of lateral riparian TOC exports
Series/Journal:Biogeosciences (1726-4189)
Year of publishing :2012
Volume:9
Number:10
Page range:3901-3916
Number of Pages:16
Publisher:European Geosciences Union
ISSN:1726-4189
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:organic carbon, ground water, riparian soils, landscape analysis
URN:NBN:urn:nbn:se:slu:epsilon-e-1505
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1505
Additional ID:
Type of IDID
Web of Science (WoS)000310471800013
Scopus2-s2.0-84867451988
DOI10.5194/bg-9-3901-2012
ID Code:10504
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:18 Jun 2013 13:38
Metadata Last Modified:24 Jan 2015 01:50

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