open access

https://hdl.handle.net/2115/49057

Impact of snow on methane emission from northern wetlands

日本語

microorganisms

2012-03-31

Institute of Low Temperature Science, Hokkaido University

Low Temperature Science

70

131-136

Northern wetland and tundra regions store approximately 30% of the world organic soil carbon and function as a major source of atmospheric methane. In this article, the impact of snow on methane emission and microorganisms in northern wetlands is reviewed. In summary, 1)Methane emission from northern wetland is reduced in winter partly by snowpack and methane is accumulated in the soil under snow;snow melt causes a “burst”of methane emission in spring. 2)Microbial activities in wetland soil are enhanced by snow cover that keeps the underlying surface soil warmer (around 0 ℃) and causes concentrated nutrients and substrates for microorganisms in unfrozen soil water. 3)Snow pack suppresses gas exchange between wetland soil and the atmosphere and melted snow may raise the level of water table, both of which expand anoxic area in soil and enhance methane production. 4)Snow can also give an impact on methane emission in a vegetative season of summer.

紀要論文

Version of Record

1880-7593