The processes of methane production and oxidation in the soils of the Russian Arctic tundra

Uncertainties in modelling CH<sub>4</sub> emissions from northern wetlands in glacial climates: the role of vegetation parameters

“…However, the oxidation in the root system is difficult to determine, and Popp et al (2000) note considerable differences between methods. According to an experiment by Berestovskaya et al (2005), CH 4 oxidation was found to occur in bog water, in green parts of peat moss and in all the soil horizons investigated, while its production was recorded in peat horizons, in clay with plant roots, and in peaty moss areas. Gas consumption by CH 4 -oxidizing bacteria in the vegetation is also supported by data from the incubation of marsh plants with up to 88 % CH 4 depletion (Calhoun and King, 1997).…”

Methane and nitrous oxide emissions from mature forest stands in the boreal forest, Saskatchewan, Canada

“…Methane fluxes are strongly regulated by the presence or absence of methanotrophs, which are generally found in the upper 10-20 cm of soil or peat (Whalen et al, 1992;Berestovskaya et al, 2005). The activity of both methanotrophs and methanogens are dependent on temperature, pH, water level, water flow, and nutrient availability (Berestovskaya et al, 2005;Rask et al, 2002;Saarnio et al, 2007;Arnold et al, 2005). Consumption and production of N 2 O, like CH 4 , dominantly occurs in the upper part of the soil (Pihlatie et al, 2007).…”

Some like it cold: microbial transformations of mercury in polar regions

“…The occurrence and rates of C1 metabolism in microbes from cold environments have been getting a lot of attention due to anticipated effects of global warming on the release of carbon from large frozen reservoirs in permafrost and polar tundra. While methanogenesis (Rivkina et al 2004;Berestovskaya et al 2005) and methanotrophy (Berestovskaya et al 2005) were detected in permafrost, rates were drastically impacted by a drop in the incubation temperature. Moreover, degradation of C1 compounds such as methylbromide or acetate, common in temperate soils (Hines et al 1998), is rarely observed at high latitudes proximal to polar areas (Hines & Duddleston 2001).…”