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Evasion of CO2 from streams: The dominant component of the carbon export through the aquatic conduit in a boreal landscape
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Department of Biological Sciences and Department of Geography, University of Cincinnati, Cincinnati, USA.
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
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2013 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 19, no 3, 785-797 p.Article in journal (Refereed) Published
Abstract [en]

Evasion of gaseous carbon (C) from streams is often poorly quantified in landscape C budgets. Even though the potential importance of the capillary network of streams as C conduits across the land-water-atmosphere interfaces is sometimes mentioned, low-order streams are often left out of budget estimates due to being poorly characterized in terms of gas exchange and even areal surface coverage. We show that evasion of C is greater than all the total dissolved C (both organic and inorganic) exported downstream in the waters of a boreal landscape. In this study evasion of carbon dioxide (CO2) from running waters within a 67 km2 boreal catchment was studied. During a four year period (2006-2009) 13 streams were sampled on 104 different occasions for dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). From a locally determined model of gas exchange properties, we estimated the daily CO2 evasion with a high-resolution (5×5 m) grid based stream evasion model comprising the entire ~100 km stream network. Despite the low areal coverage of stream surface the evasion of CO2 from the stream network constituted 53% (5.0 (±1.8) g C m−2 yr−1) of the entire stream C flux (9.6 (±2.4) g C m−2 yr−1) (lateral as DIC, DOC and vertical as CO2). In addition, 72% of the total CO2 loss took place already in the 1st and 2nd order streams. This study demonstrates the importance of including CO2 evasion from low-order boreal streams into landscape C budgets since it more than doubled the magnitude of the aquatic conduit for C from this landscape. Neglecting this term will consequently result in an overestimation of the terrestrial C sink strength in the boreal landscape.

Place, publisher, year, edition, pages
2013. Vol. 19, no 3, 785-797 p.
National Category
Environmental Sciences
URN: urn:nbn:se:uu:diva-184696DOI: 10.1111/gcb.12083ISI: 000314219700011OAI: oai:DiVA.org:uu-184696DiVA: diva2:567403
Available from: 2012-11-13 Created: 2012-11-13 Last updated: 2013-03-13Bibliographically approved

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