liu.seSearch for publications in DiVA
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Acetate turnover and methanogenic pathways in Amazonian lake sediments
Max Planck Inst Terr Microbiol, Germany.
Max Planck Inst Terr Microbiol, Germany.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Univ Fed Rio de Janeiro, Brazil.
2020 (engelsk)Inngår i: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 17, nr 4, s. 1063-1069Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Lake sediments in Amazonia are a significant source of CH4, a potential greenhouse gas. Previous studies of sediments using C-13 analysis found that the contribution of hydrogenotrophic versus acetoclastic methanogenesis to CH4 production was relatively high. Here, we determined the methanogenic pathway in the same sediments (n = 6) by applying (14)Cbicarbonate or 2-(14)Cacetate and confirmed the high relative contribution (50 %-80 %) of hydrogenotrophic methanogenesis. The respiratory index (RI) of 2-(14)Cacetate, which is (CO2)-C-14 relative to (CH4)-C-14 +(CO2)-C-14, divided the sediments into two categories, i.e., those with an RI amp;lt; 0.2 consistent with the operation of acetoclastic methanogenesis and those with an RI amp;gt; 0.4 showing that a large percentage of the acetate-methyl was oxidized to CO2 rather than reduced to CH4. Hence, part of the acetate was probably converted to CO2 plus H-2 via syntrophic oxidation, thus enhancing hydrogenotrophic methanogenesis. This happened despite the presence of potentially acetoclastic Methanosaetaceae in all the sediments. Alternatively, acetate may have been oxidized with a constituent of the sediment organic matter (humic acid) serving as oxidant. Indeed, apparent acetate turnover rates were larger than CH4 production rates except in those sediments with a Ramp;lt;0.2. Our study demonstrates that CH4 production in Amazonian lake sediments was not simply caused by a combination of hydrogenotrophic and acetoclastic methanogenesis but probably involved additional acetate turnover.

sted, utgiver, år, opplag, sider
COPERNICUS GESELLSCHAFT MBH , 2020. Vol. 17, nr 4, s. 1063-1069
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-164377DOI: 10.5194/bg-17-1063-2020ISI: 000518135400003OAI: oai:DiVA.org:liu-164377DiVA, id: diva2:1415865
Merknad

Funding Agencies|Swedish Research Council VinnovaVinnovaSwedish Research Council; Brazilian Research Council FAPERJCarlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ); Linkoping University

Tilgjengelig fra: 2020-03-20 Laget: 2020-03-20 Sist oppdatert: 2020-04-15

Open Access i DiVA

fulltext(1642 kB)11 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 1642 kBChecksum SHA-512
3663477f022e36e0c832c0e46c31d2b9da7ecec759647e139183e9b93b32fe554a3615cbb8ae3a4aa95ac8c21972837857c8fa16203d7c4ddab4ec98c6c800a9
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekst

Søk i DiVA

Av forfatter/redaktør
Enrich Prast, Alex
Av organisasjonen
I samme tidsskrift
Biogeosciences

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 11 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 27 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf