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Research article - Peer-reviewed, 2009

Landscape scale patterns in the character of natural organic matter in a Swedish boreal stream network

Temnerud, J.; Duker, A.; Karlsson, S.; Allard, B.; Koehler, S.; Bishop, K.

Abstract

This paper defines landscape-scale patterns in the character of natural organic matter (NOM) and tests for relationships to catchment soil, vegetation and topography. The drainage network of a boreal catchment, subcatchment size 0.12–78km2, in Northern Sweden was sampled in August 2002 during a period of stable low water flow. The NOM was characterized with UV/Vis spectroscopy, fluorescence, XAD-8 fractionation (%humic substances), gel permeation chromatography (apparent molecular weight), and elemental composition (C:N). The largest spatial variation was found for C:N, absorbance ratio, and specific visible absorptivity. The lowest variation was in fluorescence index, %humic substances and molecular retention time. But the variation in total organic carbon (TOC), iron and aluminium concentration was more than twice that of C:N. Between headwater and downstream sites no significant changes were distinguished in the NOM character. At stream reaches, junctions and lakes little change (<10%) in NOM character was observed. Common factor analysis and partial least squares regression (PLS) revealed that the spatial variation in surface coverage of lakes and mires could explain some of the variation of TOC and NOM character. Our suggestion is that the mosaic of landscape elements (different amounts of water from lakes, forest soil and mires) delivers NOM with varying characteristics to a channel network that mixes conservatively downstream, with possible small changes at some 20 stream reaches, junctions and lakes

Keywords

organic carbon; stream network; landscape; character; SUVA; DOC; C/N

Published in

Hydrology and Earth System Sciences
2009, volume: 13, number: 9, pages: 1567-1582

Authors' information

Temnerud, Johan
Örebro University
Düker, Anders
Örebro University
Karlsson, Stephan
Örebro University
Allard, Bert
Örebro University
Graz University of Technology
Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment

Associated SLU-program

Lakes and watercourses

Sustainable Development Goals

SDG6 Clean water

UKÄ Subject classification

Fish and Aquacultural Science
Environmental Sciences related to Agriculture and Land-use

Publication Identifiers

DOI: https://doi.org/10.5194/hess-13-1567-2009

URI (permanent link to this page)

https://res.slu.se/id/publ/28109