气候变化领域集成服务门户(CCPortal): Multi-year methane ebullition measurements from water and bare peat surfaces of a patterned boreal bog

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DOI	10.5194/bg-16-2409-2019
	Multi-year methane ebullition measurements from water and bare peat surfaces of a patterned boreal bog
	Männistö E.; Korrensalo A.; Alekseychik P.; Mammarella I.; Peltola O.; Vesala T.; Tuittila E.-S.
发表日期	2019
ISSN	17264170
起始页码	2409
结束页码	2421
卷号	16 期号:11
英文摘要	We measured methane ebullition from a patterned boreal bog situated in the Siikaneva wetland complex in southern Finland. Measurements were conducted on water (W) and bare peat surfaces (BP) in three growing seasons (2014-2016) using floating gas traps. The volume of the trapped gas was measured weekly, and methane and carbon dioxide (CO2) concentrations of bubbles were analysed from fresh bubble samples that were collected separately. We applied a mixed-effect model to quantify the effect of the environmental controlling factors on the ebullition. Ebullition was higher from W than from BP, and more bubbles were released from open water (OW) than from the water's edge (EW). On average, ebullition rate was the highest in the wettest year (2016) and ranged between 0 and 253 mgm-2 d-1 with a median of 2 mg m-2 d-1, 0 and 147 mgm-2 d-1 with a median of 3 mgm-2 d-1, and 0 and 186 mgm-2 d-1 with a median of 28 mgm-2 d-1 in 2014, 2015, and 2016, respectively. Ebullition increased together with increasing peat temperature, weekly air temperature sum and atmospheric pressure, and decreasing water table (WT). Methane concentration in the bubbles released from W was 15-20 times higher than the CO2 concentration, and from BP it was 10 times higher. The proportion of ebullition fluxes upscaled to ecosystem level for the peak season was 2 %-8% and 2 %-5% of the total flux measured with eddy covariance technique and with chambers and gas traps, respectively. Thus, the contribution of methane ebullition from wet non-vegetated surfaces of the bog to the total ecosystemscale methane emission appeared to be small. © Author(s) 2019.
scopus关键词	air temperature; atmospheric pressure; bog; Boreal Kingdom; bubble; carbon dioxide; concentration (composition); eddy covariance; methane; peat; water table; Finland
来源期刊	Biogeosciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176406
作者单位	Peatland and Soil Ecology Research Group, School of Forest Sciences, University of Eastern Finland, P.O. Box 111, Joensuu, 80101, Finland; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 68, Helsinki, 00014, Finland; Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, P.O. Box 27, Helsinki, 00014, Finland
推荐引用方式 GB/T 7714	Männistö E.,Korrensalo A.,Alekseychik P.,et al. Multi-year methane ebullition measurements from water and bare peat surfaces of a patterned boreal bog[J],2019,16(11).
APA	Männistö E..,Korrensalo A..,Alekseychik P..,Mammarella I..,Peltola O..,...&Tuittila E.-S..(2019).Multi-year methane ebullition measurements from water and bare peat surfaces of a patterned boreal bog.Biogeosciences,16(11).
MLA	Männistö E.,et al."Multi-year methane ebullition measurements from water and bare peat surfaces of a patterned boreal bog".Biogeosciences 16.11(2019).