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Seasonal variations in methane fluxes in response to summer warming and leaf litter addition in a subarctic heath ecosystem
Responsible organisation
2017 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 122, no 8, p. 2137-2153Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2017. Vol. 122, no 8, p. 2137-2153
Keywords [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
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-3904DOI: 10.1002/2017JG003782OAI: oai:DiVA.org:polar-3904DiVA, id: diva2:1165175
Note

2017JG003782

Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12

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Publisher's full texthttp://dx.doi.org/10.1002/2017JG003782
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Journal of Geophysical Research - Biogeosciences
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