uu.seUppsala universitets publikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • 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
Contribution of sediment respiration to summer CO2 emission from low productive boreal and subarctic lakes
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.ORCID-id: 0000-0003-1351-9277
Vise andre og tillknytning
2005 (engelsk)Inngår i: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 50, nr 4, s. 529-535Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We measured sediment production of carbon dioxide (CO2) and methane (CH4) and the net flux of CO2 across the surfaces of 15 boreal and subarctic lakes of different humic contents. Sediment respiration measurements were made in situ under ambient light conditions. The flux of CO2 between sediment and water varied between an uptake of 53 and an efflux of 182 mg C m−2 day−1 from the sediments. The mean respiration rate for sediments in contact with the upper mixed layer (SedR) was positively correlated to dissolved organic carbon (DOC) concentration in the water (r 2 = 0.61). The net flux of CO2 across the lake surface [net ecosystem exchange (NEE)] was also closely correlated to DOC concentration in the upper mixed layer (r 2 = 0.73). The respiration in the water column was generally 10-fold higher per unit lake area compared to sediment respiration. Lakes with DOC concentrations <5.6 mg L−1 had net consumption of CO2 in the sediments, which we ascribe to benthic primary production. Only lakes with very low DOC concentrations were net autotrophic (<2.6 mg L−1) due to the dominance of dissolved allochthonous organic carbon in the water as an energy source for aquatic organisms. In addition to previous findings of allochthonous organic matter as an important driver of heterotrophic metabolism in the water column of lakes, this study suggests that sediment metabolism is also highly dependent on allochthonous carbon sources.

sted, utgiver, år, opplag, sider
2005. Vol. 50, nr 4, s. 529-535
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-93435DOI: 10.1007/s00248-005-5007-xOAI: oai:DiVA.org:uu-93435DiVA, id: diva2:166908
Tilgjengelig fra: 2005-09-21 Laget: 2005-09-21 Sist oppdatert: 2018-05-21bibliografisk kontrollert
Inngår i avhandling
1. Carbon Dioxide Supersaturation in Lakes – Causes, Consequences and Sensitivity to Climate Change
Åpne denne publikasjonen i ny fane eller vindu >>Carbon Dioxide Supersaturation in Lakes – Causes, Consequences and Sensitivity to Climate Change
2005 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The global carbon cycle is intimately linked with the earth’s climate system. Knowledge about carbon cycling in the biosphere is therefore crucial for predictions of climate change. This thesis investigates the carbon dioxide balance of Swedish boreal lakes, its regulation, significance to the carbon budget of the boreal landscape, and sensitivity to climate change.

Swedish boreal lakes were almost exclusively supersaturated in CO2 with respect to the atmosphere, resulting in an emission of CO2 from lakes to the atmosphere. Lake pCO2 was closely related to the concentration of terrigenous dissolved organic carbon (DOC), indicating that the utilization of terrigenous DOC by lake bacteria is a major source of CO2. This conclusion is supported by independent field studies, showing that net plankton respiration accounts for most of the CO2 emitted from Swedish boreal lakes, while photochemical mineralization and sediment respiration were less important.

Mineralization of terrigenous DOC and subsequent emission of CO2 from lakes to the atmosphere was a major carbon loss factor in 21 major Swedish boreal catchments, removing 30-80% of the organic carbon exported from terrestrial soils to surface waters. Lake CO2 emission is in the same order of magnitude as organic carbon accumulation in boreal forest soils, and should therefore be included in the carbon budget of the boreal landscape.

In a set of nearly 5000 global lakes, DOC concentration was a much more important regulator of lake pCO2 than temperature. Climate change will therefore affect the carbon balance of lakes primarily via alterations in terrestrial DOC export, rather than via changes in temperature per se. Both current observations and models of future climate suggest an increasing export of terrigenous DOC from many Scandinavian catchments. Hence, there probably is a current trend towards higher CO2 emission from Swedish boreal lakes, which is likely to continue in the future.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2005. s. 42
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 90
Emneord
Biology, carbon dioxide, boreal lakes, respiration, dissolved organic carbon, climate change, Biologi
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-5920 (URN)91-554-6329-0 (ISBN)
Disputas
2005-10-14, Ekmansalen, Kärnhuset, EBC, Norbyvägen 14, Uppsala, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2005-09-21 Laget: 2005-09-21 Sist oppdatert: 2009-03-30bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekst

Personposter BETA

Sobek, SebastianTranvik, Lars J.

Søk i DiVA

Av forfatter/redaktør
Sobek, SebastianTranvik, Lars J.
Av organisasjonen
I samme tidsskrift
Microbial Ecology

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 770 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • 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