Potential aerobic methane oxidation in a Sphagnum-dominated peatland—Controlling factors and relation to methane emission

Sundh, Ingvar; Mikkelä, Catharina; Nilsson, Mats; Svensson, Bo

doi:10.1016/0038-0717(94)00222-m

Cited by 126 publications

(76 citation statements)

References 26 publications

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“…Generally, negative fluxes have been associated with higher methane oxidation by methanotrophic microbes than methane production by archaea. Since methanotrophic microbes are aerobic, methane oxidation capacity is higher in drier plant community types that have a thicker aerobic peat layer (Sundh et al, 1995). This is typical for hummocks that can even serve as a sink for atmospheric methane (Frenzel and Karofeld, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…This is typical for hummocks that can even serve as a sink for atmospheric methane (Frenzel and Karofeld, 2000). Methane oxidation activity is usually the highest near average WT, where methanotrophs have an optimal availability of both methane and oxygen (Sundh et al, 1995;Dedysh, 2002). Therefore, methane consumption also takes place in wetter plant community types that have a WT close to the soil surface when they are not waterlogged.…”

Section: Discussionmentioning

confidence: 99%

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Small spatial variability in methane emission measured from a wet patterned boreal bog

et al. 2018

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Abstract. We measured methane fluxes of a patterned bog situated in Siikaneva in southern Finland from six different plant community types in three growing seasons (2012)(2013)(2014) using the static chamber method with chamber exposure of 35 min. A mixed-effects model was applied to quantify the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, species composition, total leaf area (LAI TOT ) and leaf area of aerenchymatous plant species (LAI AER ). Methane emissions ranged from −309 to 1254 mg m −2 d −1 . Although methane fluxes increased with increasing peat temperature, LAI TOT and LAI AER , they had no correlation with water table or with plant community type. The only exception was higher fluxes from hummocks and high lawns than from high hummocks and bare peat surfaces in 2013 and from bare peat surfaces than from high hummocks in 2014. Chamber fluxes upscaled to ecosystem level for the peak season were of the same magnitude as the fluxes measured with the eddy covariance (EC) technique. In 2012 and in August 2014 there was a good agreement between the two methods; in 2013 and in July 2014, the chamber fluxes were higher than the EC fluxes.Net fluxes to soil, indicating higher methane oxidation than production, were detected every year and in all community types. Our results underline the importance of both LAI AER and LAI TOT in controlling methane fluxes and indicate the need for automatized chambers to reliably capture localized events to support the more robust EC method.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Small spatial variability in methane emission measured from a wet patterned boreal bog

et al. 2018

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“…Therefore, sites with higher organic Illatter contents tend to both produce and consume more CH, because high organie content enhances methanogenesis, and populations of rnethanotrophs are greatest where CIl., is abundantly available (Svensson and Sundh, 1992;Sundh et al, 1995).…”

Section: Environmental Controis Of Ch 4 Emissionsmentioning

confidence: 99%

“…l'rom the sediments. Consumption potentials were also greatest in surface sediments, indicating that the greatest numbers of methanotrophs inhabit these layers (cf Sundh et al, 1995).…”

Section: Choxidationmentioning

confidence: 99%

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Methane dynamics of a northern boreal beaver pond

et al. 1999

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Ground heating and methane oxidation processes at shallow depth in Terre Calde di Medolla (Italy): Observations and conceptual model

et al. 2015

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The toponym "Terre Calde di Medolla" (literally, "Warm Earths of Medolla") refers to a farming area, located near the town of Modena (Emilia-Romagna region, northern Italy), which has always been known by the local population for the relatively high temperatures of the soil. This phenomenon is particularly evident in wintertime when the snow cover over this area rapidly melts. A detailed investigation, carried out after the devastating 2012 Emilia earthquake that affected this area, showed soil temperatures up to 44°C, i.e., 20-25°C above the local background value, together with diffuse soil fluxes of CH 4 (0-2432 g × m, especially from subcircular (a few meters in diameter) zones. Ground heating and gas seepage appear spatially correlated, thus suggesting a close relationship between the two phenomena. The anomalous high ground temperature is not associated with an anomalous geothermal gradient or with the uprising of deep-seated hot fluids. According to the lateral and vertical distributions of the temperatures as well as the chemical and isotopic compositions of the soil gases, the most reliable explanation is the exothermic oxidation of diffusely uprising biogenic methane at very shallow levels (<1 m). Such a process occurs in the presence of free oxygen and methanotrophic bacteria and can then explain (i) the observed ground heating up, (ii) the diffuse emission from the soil of CO 2 characterized by an extremely negative isotopic ( 13 C/ 12 C) signature, and (iii) the lack of diffuse and low CH 4 fluxes. According to these hypotheses, the heating phenomena affecting the shallow groundwater and the ground surface, as described by several witnesses in the area of the May-June 2012 Emilia earthquake, could be related to either a coseismic or postseismic onset of new areas affected by CH 4 seepage or an increase in preexisting CH 4 fluxes.

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Potential aerobic methane oxidation in a Sphagnum-dominated peatland—Controlling factors and relation to methane emission

Cited by 126 publications

References 26 publications

Small spatial variability in methane emission measured from a wet patterned boreal bog

Small spatial variability in methane emission measured from a wet patterned boreal bog

Methane dynamics of a northern boreal beaver pond

Ground heating and methane oxidation processes at shallow depth in Terre Calde di Medolla (Italy): Observations and conceptual model

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