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Carbon Sequestration in a Large Hydroelectric Reservoir: An Integrative Seismic Approach
Univ Fed Juiz de Fora, Aquat Ecol Lab, BR-36036900 Juiz De Fora, MG, Brazil; Wageningen Univ, Dept Aquat Ecol & Water Qual Management, NL-6700 AP Wageningen, Netherlands.
Wageningen Univ, Dept Aquat Ecol & Water Qual Management, NL-6700 AP Wageningen, Netherlands; Leibniz Inst Freshwater Ecol & Inland Fisheries I, Berlin, Germany; Radboud Univ Nijmegen, Inst Water & Wetland Res, Dept Aquat Ecol & Environm Biol, NL-6525 ED Nijmegen, Netherlands.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Cary Inst Ecosyst Studies, Millbrook, NY USA.
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2014 (English)In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 17, no 3, 430-441 p.Article in journal (Refereed) Published
Abstract [en]

Artificial reservoirs likely accumulate more carbon than natural lakes due to their unusually high sedimentation rates. Nevertheless, the actual magnitude of carbon accumulating in reservoirs is poorly known due to a lack of whole-system studies of carbon burial. We determined the organic carbon (OC) burial rate and the total OC stock in the sediments of a tropical hydroelectric reservoir by combining a seismic survey with sediment core sampling. Our data suggest that no sediment accumulation occurs along the margins of the reservoir and that irregular bottom morphology leads to irregular sediment deposition. Such heterogeneous sedimentation resulted in high spatial variation in OC burial-from 0 to 209 g C m(-2) y(-1). Based on a regression between sediment accumulation and OC burial rates (R (2) = 0.94), and on the mean reservoir sediment accumulation rate (0.51 cm y(-1), from the seismic survey), the whole-reservoir OC burial rate was estimated at 42.2 g C m(-2) y(-1). This rate was equivalent to 70% of the reported carbon emissions from the reservoir surface to the atmosphere and corresponded to a total sediment OC accumulation of 0.62 Tg C since the reservoir was created. The approach we propose here allows an inexpensive and integrative assessment of OC burial in reservoirs by taking into account the high degree of spatial variability and based on a single assessment. Because burial can be assessed shortly after the survey, the approach combining a seismic survey and coring could, if applied on a larger scale, contribute to a more complete estimate of carbon stocks in freshwater systems in a relatively short period of time.

Place, publisher, year, edition, pages
2014. Vol. 17, no 3, 430-441 p.
Keyword [en]
hydroelectric reservoir, carbon cycle, organic carbon burial, seismic survey, sedimentation, tropical ecosystem
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-269306DOI: 10.1007/s10021-013-9735-3ISI: 000333130700005OAI: oai:DiVA.org:uu-269306DiVA: diva2:882624
Funder
Swedish Research Council Formas
Available from: 2015-12-15 Created: 2015-12-15 Last updated: 2017-12-01Bibliographically approved

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Mendonca, RaquelSobek, Sebastian

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