Ecosystems

, Volume 17, Issue 3, pp 430–441

Carbon Sequestration in a Large Hydroelectric Reservoir: An Integrative Seismic Approach

Authors

    • Laboratory of Aquatic EcologyFederal University of Juiz de Fora
    • Department of Aquatic Ecology and Water Quality ManagementWageningen University
  • Sarian Kosten
    • Department of Aquatic Ecology and Water Quality ManagementWageningen University
    • Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB)
    • Department of Aquatic Ecology and Environmental Biology, Institute for Water and Wetland ResearchRadboud University Nijmegen
  • Sebastian Sobek
    • Department of Ecology and Genetics, LimnologyUppsala University
  • Jonathan J. Cole
    • Cary Institute of Ecosystem Studies
  • Alex C. Bastos
    • Department of Oceanography and EcologyUniversidade Federal do Espírito Santo
  • Ana Luiza Albuquerque
    • Departamento de GeoquímicaUniversidade Federal Fluminense
  • Simone J. Cardoso
    • Laboratory of Aquatic EcologyFederal University of Juiz de Fora
  • Fábio Roland
    • Laboratory of Aquatic EcologyFederal University of Juiz de Fora
Article

DOI: 10.1007/s10021-013-9735-3

Cite this article as:
Mendonça, R., Kosten, S., Sobek, S. et al. Ecosystems (2014) 17: 430. doi:10.1007/s10021-013-9735-3

Abstract

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 (R2 = 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.

Keywords

hydroelectric reservoircarbon cycleorganic carbon burialseismic surveysedimentationtropical ecosystem

Supplementary material

10021_2013_9735_MOESM1_ESM.rtf (420 kb)
Supplementary material 1 (RTF 419 kb)
10021_2013_9735_MOESM2_ESM.rtf (81 kb)
Supplementary material 2 (RTF 81 kb)
10021_2013_9735_MOESM3_ESM.rtf (4.5 mb)
Supplementary material 3 (RTF 4614 kb)

Copyright information

© Springer Science+Business Media New York 2013