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Regional diversity of complex dissolved organic matter across forested hemiboreal headwater streams
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. Uppsala University, Sweden.
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Number of Authors: 62018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 16060Article in journal (Refereed) Published
Abstract [en]

Dissolved organic matter (DOM) from soils enters the aquatic environment via headwater streams. Thereafter, it is gradually transformed, removed by sedimentation, and mineralised. Due to the proximity to the terrestrial source and short water residence time, the extent of transformation is minimal in headwaters. DOM has variable composition across inland waters, but the amount of variability in the terrestrial end member is unknown. This gap in knowledge is crucial considering the potential impact large variability would have on modelling DOM degradation. Here, we used a novel liquid chromatography-mass spectrometry method to characterise DOM in 74 randomly selected, forested headwater streams in an 87,000 km(2) region of southeast Sweden. We found a large degree of sample similarity across this region, with Bray-Curtis dissimilarity values averaging 8.4 +/- 3.0% (mean +/- SD). The identified variability could be reduced to two principle coordinates, correlating to varying groundwater flow-paths and regional mean temperature. Our results indicate that despite reproducible effects of groundwater geochemistry and climate, the composition of DOM is remarkably similar across catchments already as it leaves the terrestrial environment, rather than becoming homogeneous as different headwaters and sub-catchments mix.

Place, publisher, year, edition, pages
2018. Vol. 8, article id 16060
National Category
Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-161911DOI: 10.1038/s41598-018-34272-3ISI: 000448745700002PubMedID: 30375497OAI: oai:DiVA.org:su-161911DiVA, id: diva2:1262885
Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-13Bibliographically approved

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