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

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Author(s): J. Temnerud | A. Düker | S. Karlsson | B. Allard | S. Köhler | K. Bishop

Journal: Hydrology and Earth System Sciences
ISSN 1027-5606

Volume: 13;
Issue: 9;
Start page: 1567;
Date: 2009;
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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 0.12–78 km2, 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. 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 (

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