Wallin, Marcus
- Uppsala University
Abstract
Although lateral carbon (C) export from terrestrial to aquatic systems is known to be an important component in landscape C balances, most existing global studies are lacking empirical data on the soil C export. In this study, the concentration, character, and export of dissolved organic carbon (DOC) were studied during 2years in two hemiboreal headwater streams draining catchments with different soil characteristics (mineral versus peat soils). The streams exposed surprisingly similar strong air temperature controls on the temporal variability in DOC concentration in spite of draining such different catchments. The temporal variability in DOC character (determined by absorbance metrics, specific ultraviolet absorbance 254 (SUVA(254)) as a proxy for aromaticity and a254/a365 ratio as a proxy for mean molecular weight) was more complex but related to stream discharge. While the two streams showed similar ranges and patterns in SUVA(254), we found a significant difference in median a254/a354, suggesting differences in the DOC character. Both streams responded similarly to hydrological changes with higher a254/a365 at higher discharge, although with rather small differences in a254/a365 between base flow and high flow (
Keywords
DOC; C budget; headwaters; soil-stream interface; inland waters
Published in
Journal of Geophysical Research: Biogeosciences
2015, volume: 120, number: 5, pages: 832-846
Publisher: AMER GEOPHYSICAL UNION
SLU Authors
UKÄ Subject classification
Oceanography, Hydrology, Water Resources
Publication identifier
- DOI: https://doi.org/10.1002/2014JG002814
Permanent link to this page (URI)
https://res.slu.se/id/publ/105676