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CH4 uptake along a successional gradient in temperate alpine soils

Artikel i vetenskaplig tidskrift
Författare Cole Brachmann
G Hernandez-Ramirez
D Hik
Publicerad i Biogeochemistry
Volym 147
Sidor 109–123
ISSN 0168-2563
Publiceringsår 2020
Publicerad vid Institutionen för geovetenskaper
Sidor 109–123
Språk en
Länkar https://doi.org/10.1007/s10533-019-...
Ämnesord Columbia mountains, Methane, Soil fluxes, Alpine, Deglaciated terrain
Ämneskategorier Terrestrisk ekologi, Geokemi, Miljövetenskap, Markvetenskap

Sammanfattning

The effects of climate change appear to be amplified in mountains compared with lowland areas, with rapid changes in plant community composition, soil properties, and increased substrate for biological development following retreat of glaciers. Associated soil gaseous fluxes in alpine ecosystems contribute to the global balance of greenhouse gases, but methane and carbon dioxide soil fluxes and their controls are not well known. We used a dynamic closed-chamber method to measure methane and carbon dioxide fluxes along a successional gradient during the peak growing season in the North Selkirk Mountains, British Columbia, Canada. Soil physico-chemical properties, vegetation cover, and topographic variables were quantified to determine mechanisms influencing these fluxes. Mean methane uptake ranged from - 155 lg CH4-C m- 2 h-1 in well vegetated sites to zero in recently deglaciated terrain. Soil total carbon (TC) and water content were the primary drivers of methane uptake. Sites with TC greater than 4% and moisture below 0.22 water fraction by volume (w.f.v) corresponded to the strongest methane sinks. Increased vegetation cover and relatively drier soil conditions, anticipated with future climate change, suggest that methane uptake may increase in these alpine ecosystems.

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