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Importance of seasonality and small streams for the landscape regulation of dissolved organic carbon export
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Skogsekologi, Sveriges lantbruksuniversitet, Umeå.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2007 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 112, Art. No. G03003- p.Article in journal (Refereed) Published
Abstract [en]

The regulation of the spatial and seasonal variation in terrestrial dissolved organic carbon (DOC) exports was studied in a 68 km2 boreal stream system in northern Sweden. A total of 1213 DOC samples were collected in 15 subcatchments over a 3 year period (2003–2005). The mean annual DOC exports from the 15 subcatchments (0.03–21.72 km2) ranged from 14.8 to 99.1 kg ha−1 yr−1. Many catchment characteristics determined the spatial variation in DOC exports. The relative importance of the different catchment characteristics varied greatly between seasons because of differing hydrological conditions. During winter base flow the spatial variation was linked to patterns in wetland coverage. During snowmelt in spring the spatial variation was connected to characteristics describing size and location, i.e., median stream size, silty sediment distribution, stream order, altitude, and proportion of catchment above highest postglacial coastline (HC). During the snow-free season the spatial variation in DOC exports was regulated by the amount of wetlands and forests, particularly forests made up of Norway spruce (Picea abies). Median stream size also influenced the exports during this season. A striking result in this study was the effect of size implying that small headwaters may be the largest contributor to the terrestrial DOC export, per unit area.

Place, publisher, year, edition, pages
2007. Vol. 112, Art. No. G03003- p.
Identifiers
URN: urn:nbn:se:umu:diva-6223DOI: 10.1029/2006JG000381OAI: oai:DiVA.org:umu-6223DiVA: diva2:145891
Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2010-01-08Bibliographically 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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Jansson, MatsLaudon, Hjalmar

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