Spatial variation of sediment mineralization supports differential CO2 emissions from a tropical hydroelectric reservoir

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Cardoso, Simone J.Laboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, Brazil (author)

Spatial variation of sediment mineralization supports differential CO2 emissions from a tropical hydroelectric reservoir

Article/chapterEnglish2013

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2013
Frontiers Media SA,2013
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:uu-208611
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208611URI
https://doi.org/10.3389/fmicb.2013.00101DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

Substantial amounts of organic matter (OM) from terrestrial ecosystems are buried as sediments in inland waters. It is still unclear to what extent this OM constitutes a sink of carbon, and how much of it is returned to the atmosphere upon mineralization to carbon dioxide (CO2). The construction of reservoirs affects the carbon cycle by increasing OM sedimentation at the regional scale. In this study we determine the OM mineralization in the sediment of three zones (river, transition, and dam) of a tropical hydroelectric reservoir in Brazil as well as identify the composition of the carbon pool available for mineralization. We measured sediment organic carbon mineralization rates and related them to the composition of the OM, bacterial abundance and pCO2 of the surface water of the reservoir. Terrestrial OM was an important substrate for the mineralization. In the river and transition zones most of the OM was allochthonous (56 and 48%, respectively) while the dam zone had the lowest allochthonous contribution (7%). The highest mineralization rates were found in the transition zone (154.80 ± 33.50 mg C m-2 d-1) and the lowest in the dam (51.60 ± 26.80 mg C m-2 d-1). Moreover, mineralization rates were significantly related to bacterial abundance (r2= 0.50, p < 0.001) and pCO2 in the surface water of the reservoir (r2 = 0.73, p < 0.001). The results indicate that allochthonous OM has different contributions to sediment mineralization in the three zones of the reservoir. Further, the sediment mineralization, mediated by heterotrophic bacteria metabolism, significantly contributes to CO2supersaturation in the water column, resulting in higher pCO2 in the river and transition zones in comparison with the dam zone, affecting greenhouse gas emission estimations from hydroelectric reservoirs.

Subject headings and genre

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
freshwater sediment
carbon mineralization
stable isotopes
pCO2
heterotrophic bacteria
hydroelectric reservoir
Cerrado
Brazil

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Vidal, Luciana O.Laboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, Brazil (author)
Mendonça, Raquel F.Laboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, Brazil (author)
Tranvik, Lars J.Uppsala universitet,Limnologi(Swepub:uu)larstran (author)
Sobek, SebastianUppsala universitet,Limnologi(Swepub:uu)sebasobe (author)
Fábio, RolandLaboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, Brazil (author)
Laboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, BrazilLimnologi (creator_code:org_t)

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In:Frontiers in Microbiology: Frontiers Media SA4, s. 101-1664-302X

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