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- W1970194855 abstract "This chapter focuses on controls on spatial and temporal trends in subsurface carbon dioxide (CO2) and methane (CH4) production, as well as on the transport and release of gases from the soil observed in the valley Zackenbergdalen. A dominance of near surface temperatures controlling both spatial and seasonal trends has been shown based on the data obtained using closed-chamber and eddy-correlation techniques, as well as on the data obtained from manipulated field plots and controlled incubation experiments. The water content is a major factor regulating soil respiration processes, but the effect is quite different in contrasting vegetation types. In contrast, water-saturated conditions during most of the growing season in the fen areas hinder the availability of oxygen, resulting in both CO2 and CH4 production. Thus, water-table drawdown results in decreasing CH4 effluxes but increasing CO2 effluxes. Additional controls on gas production are shown to be related to the availability of substrate and plant productivity. Bursts of CO2 gas have been observed during spring thaw. Field observations as well as experimental work suggest that such bursts represent partly on-going soil respiration and a physical release of gas produced during the winter. Because of the complexity of factors controlling subsurface gas production, different parts of the landscape will respond quite differently to the same climate changes, and short-term effects are likely to be different from long-term effects." @default.
- W1970194855 created "2016-06-24" @default.
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- W1970194855 date "2008-01-01" @default.
- W1970194855 modified "2023-10-18" @default.
- W1970194855 title "High‐Arctic Soil CO2 and CH4 Production Controlled by Temperature, Water, Freezing and Snow" @default.
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- W1970194855 doi "https://doi.org/10.1016/s0065-2504(07)00019-0" @default.
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