Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • 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
Seasonal variations in methane fluxes in response to summer warming and leaf litter addition in a subarctic heath ecosystem
Ansvarlig organisasjon
2017 (engelsk)Inngår i: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 122, nr 8, s. 2137-2153Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Methane (CH4) is a powerful greenhouse gas controlled by both biotic and abiotic processes. Few studies have investigated CH4 fluxes in subarctic heath ecosystems, and climate change-induced shifts in CH4 flux and the overall carbon budget are therefore largely unknown. Hence, there is an urgent need for long-term in situ experiments allowing for the study of ecosystem processes over time scales relevant to environmental change. Here we present in situ CH4 and CO2 flux measurements from a wet heath ecosystem in northern Sweden subjected to 16 years of manipulations, including summer warming with open-top chambers, birch leaf litter addition, and the combination thereof. Throughout the snow-free season, the ecosystem was a net sink of CH4 and CO2 (CH4 −0.27 mg C m−2 d−1; net ecosystem exchange −1827 mg C m−2 d−1), with highest CH4 uptake rates (−0.70 mg C m−2 d−1) during fall. Warming enhanced net CO2 flux, while net CH4 flux was governed by soil moisture. Litter addition and the combination with warming significantly increased CH4 uptake rates, explained by a pronounced soil drying effect of up to 32% relative to ambient conditions. Both warming and litter addition also increased the seasonal average concentration of dissolved organic carbon in the soil. The site was a carbon sink with a net uptake of 60 g C m−2 over the snow-free season. However, warming reduced net carbon uptake by 77%, suggesting that this ecosystem type might shift from snow-free season sink to source with increasing summer temperatures.

sted, utgiver, år, opplag, sider
2017. Vol. 122, nr 8, s. 2137-2153
Emneord [en]
Biogeochemical cycles, processes, and modeling, Biosphere/atmosphere interactions, Carbon cycling, Tundra, Biogeochemical cycles, processes, and modeling, methane oxidation, open-top chambers, carbon budget, soil moisture, long-term field experiment, climate change
HSV kategori
Identifikatorer
URN: urn:nbn:se:polar:diva-3904DOI: 10.1002/2017JG003782OAI: oai:DiVA.org:polar-3904DiVA, id: diva2:1165175
Merknad

2017JG003782

Tilgjengelig fra: 2017-12-12 Laget: 2017-12-12 Sist oppdatert: 2017-12-12

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fullteksthttp://dx.doi.org/10.1002/2017JG003782
I samme tidsskrift
Journal of Geophysical Research - Biogeosciences

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 18 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • 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