Huttunen Jari T, Alm Jukka, Saarijärvi Erkki, Lappalainen K Matti, Silvola Jouko, Martikainen Pertti J
Department of Environmental Sciences, Bioteknia 2, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland.
Chemosphere. 2003 Jan;50(2):247-50. doi: 10.1016/s0045-6535(02)00148-0.
The springtime methane (CH4) emission from a small, eutrophied boreal lake was assessed during the winter ice-cover by measurement of gas ebullition and CH4 accumulation in the water column in association with the development of oxygen depletion after ice formation. The winter CH4 production was estimated to result in a loss of 3.6-7.9 g CH4 m(-2) from the lake to the atmosphere during the short period of ice melt. This could account for 22-48% of the annual CH4 emission from the pelagic zone of the lake. The contribution of winter to the annual CH4 release can be similar or even higher in seasonally ice-covered northern aquatic ecosystems than in northern terrestrial wetlands, thus winter must be considered in any studies into the aquatic CH4 emissions. The trophic state and wintertime oxygen conditions, linked to the changes in land-use in the catchments and climate, are important factors controlling the springtime lake CH4 emissions.
在冬季冰封期，通过测量气体冒泡以及水柱中甲烷（CH₄）的积累，并结合结冰后氧消耗的发展情况，对一个小型富营养化北方湖泊春季的甲烷（CH₄）排放进行了评估。据估计，冬季甲烷产生量导致在短时间的融冰期内，从湖泊向大气损失3.6 - 7.9克CH₄·米⁻²。这可能占该湖泊中上层水域年甲烷排放量的22% - 48%。在季节性结冰的北方水生生态系统中，冬季对年甲烷释放的贡献可能与北方陆地湿地相似甚至更高，因此在任何关于水生甲烷排放的研究中都必须考虑冬季因素。与集水区土地利用变化和气候相关的营养状态及冬季氧气条件，是控制春季湖泊甲烷排放的重要因素。
