Journal Title
Title of Journal: Ambio
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Publisher
Springer Netherlands
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Authors: Julio Werner Yoshioka Bernardo Michael Mannich Stephan Hilgert Cristovão Vicente Scapulatempo Fernandes Tobias Bleninger
Publish Date: 2017/01/10
Volume: 46, Issue: 5, Pages: 566-577
Abstract
Sustainability of hydropower reservoirs has been questioned since the detection of their greenhouse gas GHG emissions which are mainly composed of carbon dioxide and methane A method to assess the impact on the carbon cycle caused by the transition from a natural river system into a reservoir is presented and discussed The method evaluates the long term changes in carbon stock instead of the current approach of monitoring and integrating continuous short term fluxes A case study was conducted in a subtropical reservoir in Brazil showing that the carbon content within the reservoir exceeds that of the previous landuse The average carbon sequestration over 43 years since damming was 895 mg C m2mathrmday1 and found to be mainly due to storage of carbon in sediments These results demonstrate that reservoirs have two opposite effects on the balance of GHGs By storing organic C in sediments reservoirs are an important carbon sink On the other hand reservoirs increase the flux of methane into the atmosphere If the sediments of reservoirs could be used for long term C storage reservoirs might have a positive effect on the balance of GHGsThe authors acknowledge the Project funding within the ANEEL Brazilian National Energy Agency Call 09/2008 supported by the APINE companies The authors are thankful to the Project Partner LACTEC for leading the project and collaborating during the measurement campaigns and providing the additional data Special thanks go to Maurícius M dos Santos and Vanessa D Gonçcalves for laboratory analyses and field sampling João P J Sabóoia for chamber and funnel flux measurements Elaine V Oliva for soil profile sampling and vegetation data We also would like to thank the energy company COPEL specially to Juarez Alves de Araujo for the support during the measurement campaigns and the Brazilian funding agencies CAPES and CNPq for providing scholarships for the participating doctoral and master students We are indebted to the BadenWürttemberg Stiftung for the financial support of this Research Project by the BadenWürttembergSTIPENDIUM BWS plus
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