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- W2748651350 abstract "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 (DOC) 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." @default.
- W2748651350 created "2017-08-31" @default.
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- W2748651350 date "2017-08-01" @default.
- W2748651350 modified "2023-09-24" @default.
- W2748651350 title "Seasonal variations in methane fluxes in response to summer warming and leaf litter addition in a subarctic heath ecosystem" @default.
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- W2748651350 doi "https://doi.org/10.1002/2017jg003782" @default.
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