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Terrestrial export of highly bioavailable carbon from small boreal catchments in spring floods
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2008 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 53, no 5, 964-972 p.Article in journal (Refereed) Published
Abstract [en]

1. We assessed the terrestrial export of organic carbon, which effectively supported aquatic bacterial production (BP), from small boreal catchments during spring flood. We analysed stream runoff from nine small catchments with different proportions of peat mires and coniferous forests by monitoring the dissolved organic carbon (DOC) flux in combination with conducting bacterial bioassays.

2. Multiple linear regression analysis showed that BP during 7-day-dark bioassays (BP7; μg C L-1day-1) was explained by both the quantity and quality (low-molecular weight fractions) of the DOC. BP7 can be used as a measure of export of terrestrial organic carbon that is highly bioavailable.

3. Total export of DOC during spring flood from the different catchments ranged from 20 to 27 kg ha-1 and was negatively correlated to forest cover (%). However, the export of BP7 carbon was positively correlated to forest cover and varied from about 0.1 kg ha-1 in mire-dominated streams to about 0.2 kg ha-1 in forest-dominated streams.

4. The high bioavailability of forest carbon suggests that forests are the main contributors of BP-supporting carbon in boreal streams although mires have higher area-specific export of DOC.

Place, publisher, year, edition, pages
2008. Vol. 53, no 5, 964-972 p.
Keyword [en]
bacterial production, bioavailability, dissolved organic carbon, forests, mires
Identifiers
URN: urn:nbn:se:umu:diva-11455DOI: doi:10.1111/j.1365-2427.2008.01955.xOAI: oai:DiVA.org:umu-11455DiVA: diva2:151126
Available from: 2009-01-08 Created: 2009-01-08 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Seasonal variation and landscape regulation of dissolved organic carbon concentrations and character in Swedish boreal streams
Open this publication in new window or tab >>Seasonal variation and landscape regulation of dissolved organic carbon concentrations and character in Swedish boreal streams
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The seasonal variation and landscape regulation of dissolved organic carbon (DOC) concentrations in streams have been studied in two watersheds in the boreal zone. The seasonal variation was found to be highly correlated to variations in runoff. An increase in runoff was always accompanied with an increase in DOC concentration. However, there were indications that the TOC concentration was restricted by the soil TOC pool during snowmelt.

The main factors affecting DOC exports varied between seasons. During winter baseflow the spatial variation in DOC exports was strongly influenced by wetland coverage, during snowmelt the exports were correlated to factors describing the size and location of the catchment, and during the snow-free season they were heavily affected by the proportions of wetlands and forests in the catchments. Small headwaters had the highest terrestrial DOC export, per unit area.

The properties of the DOC changed during spring flood, towards lower molecular weight and more aliphatic compounds. These changes affected the bioavailability of the DOC, which increased during spring flood. There were also differences in the DOC properties between wetlands and forest soils; the forested soils yielded DOC with lower molecular weight (measured as 254 nm/365 nm light absorbance ratios), largely from superficial layers that were activated during high flow events, while wetland soils generally provided a more constant carbon source with higher molecular weight. The majority of the DOC was exported by wetlands, but most of the short-term bioavailable DOC (BP7) was derived from the forests, during the spring flood period, indicating that bacterial production in streams and lakes is likely to be almost entirely based on DOC exported from forested areas during, and some time after, the spring flood event.

Place, publisher, year, edition, pages
Umeå: Ekologi, miljö och geovetenskap, 2007. 35 p.
Keyword
DOC, temporal variation, spatial variation, seasonal variation, forested catchment, wetland catchment, catchment characteristics, DOC characteristics, absorbance-ratio, bioavailability.
National Category
Physical Geography
Identifiers
urn:nbn:se:umu:diva-1374 (URN)978-91-7264-372-7 (ISBN)
Public defence
2007-10-19, KB3A9, KBC, Umeå universitet, Umeå, 09:00 (English)
Opponent
Supervisors
Available from: 2007-09-28 Created: 2007-09-28 Last updated: 2010-01-08Bibliographically approved

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