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Organic carbon decomposition rates controlled by water retention time across inland waters
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, S-75007 Uppsala, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2016 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 9, no 7, 501-504 p.Article in journal (Refereed) PublishedText
Abstract [en]

The loss of organic carbon during passage through the continuum of inland waters from soils to the sea is a critical component of the global carbon cycle(1-3). Yet, the amount of organic carbon mineralized and released to the atmosphere during its transport remains an open question(2,4-6), hampered by the absence of a common predictor of organic carbon decay rates(1,7). Here we analyse a compilation of existing field and laboratory measurements of organic carbon decay rates and water residence times across a wide range of aquatic ecosystems and climates. We find a negative relationship between the rate of organic carbon decay and water retention time across systems, entailing a decrease in organic carbon reactivity along the continuum of inland waters. We find that the half-life of organic carbon is short in inland waters (2.5 +/- 4.7 yr) compared to terrestrial soils and marine ecosystems, highlighting that freshwaters are hotspots of organic carbon degradation. Finally, we evaluate the response of organic carbon decay rates to projected changes in runoff(8). We calculate that regions projected to become drier or wetter as the global climate warms will experience changes in organic carbon decay rates of up to about 10%, which illustrates the influence of hydrological variability on the inland waters carbon cycle.

Place, publisher, year, edition, pages
2016. Vol. 9, no 7, 501-504 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-301038DOI: 10.1038/NGEO2720ISI: 000379823800011OAI: oai:DiVA.org:uu-301038DiVA: diva2:953473
Funder
Swedish Research CouncilSwedish Research Council for Environment, Agricultural Sciences and Spatial PlanningKnut and Alice Wallenberg FoundationWenner-Gren Foundations
Available from: 2016-08-17 Created: 2016-08-17 Last updated: 2016-08-17Bibliographically approved

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Catalan, NuriaTranvik, Lars. J.
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