Methane oxidation activity in various soils and freshwater sediments: Occurrence, characteristics, vertical profiles, and distribution on grain size fractions

Bender, Martin; Conrad, Ralf

doi:10.1029/94jd00266

Cited by 156 publications

(135 citation statements)

References 48 publications

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“…Consistent with previous studies (11,42), methane uptake rates in incubations under conditions with in situ concentration (Fig. 4) were in the range (0.01 to 0.75 nmol g [dw] Ϫ1 h Ϫ1 ) found in various forest soils incubated under conditions with atmospheric methane concentrations.…”

Section: Resultssupporting

confidence: 91%

“…The pmoA and mmoX genes encode subunits of pMMO and sMMO, respectively, and have been used to examine methanotroph diversity in culture-independent studies (9,10). Some methanotrophs have a particularly high affinity for methane and can oxidize methane at low (Յ40 ppm by volume [ppm v ]) to atmospheric (1.7 ppm v ) concentrations (11)(12)(13)(14). Besides a few cultivated Methylocystis spp., a plentitude of phylogenetically distinct pmoA sequences typically retrieved from forest, grassland, and meadow soils has been associated with atmospheric methane oxidation (15)(16)(17).…”

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confidence: 99%

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Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Erens

Mujinya

et al. 2013

Appl Environ Microbiol

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g Termite-derived methane contributes 3 to 4% to the total methane budget globally. Termites are not known to harbor methaneoxidizing microorganisms (methanotrophs). However, a considerable fraction of the methane produced can be consumed by methanotrophs that inhabit the mound material, yet the methanotroph ecology in these environments is virtually unknown. The potential for methane oxidation was determined using slurry incubations under conditions with high (12%) and in situ (ϳ0.004%) methane concentrations through a vertical profile of a termite (Macrotermes falciger) mound and a reference soil. Interestingly, the mound material showed higher methanotrophic activity. The methanotroph community structure was determined by means of a pmoA-based diagnostic microarray. Although the methanotrophs in the mound were derived from populations in the reference soil, it appears that termite activity selected for a distinct community. Applying an indicator species analysis revealed that putative atmospheric methane oxidizers (high-indicator-value probes specific for the JR3 cluster) were indicative of the active nest area, whereas methanotrophs belonging to both type I and type II were indicative of the reference soil. We conclude that termites modify their environment, resulting in higher methane oxidation and selecting and/or enriching for a distinct methanotroph population.

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Section: Resultssupporting

confidence: 91%

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confidence: 99%

Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Erens

Mujinya

et al. 2013

Appl Environ Microbiol

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“…This appears to be an unrealistic condition based on our results. Results by Bender and Conrad [1994] also support our assertion that laboratory soil incubations can sometimes complicate the experimental conditions desired to mirror field conditions. They noted that in counting methanotrophic bacteria in one particular experiment, they could not be sure that the ones that were discovered and counted were actually the ones doing the oxidation of CH 4 under field conditions.…”

Section: Resultssupporting

confidence: 76%

Methane oxidation and pathways of production in a Texas paddy field deduced from measurements of flux, δ^l3C, and δD of CH₄

Tyler¹,

Bilek²,

Sass³

et al. 1997

Global Biogeochemical Cycles

135

186

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Abstract. Irrigated rice paddies are one of the few methane (CH4) sources where the management of its emissions may be possible. Before that can be initiated, however, the relationship between production, oxidation, and emission of CH 4 and the processes controlling them must be better known. To that end we have made measurements of concentration and stable carbon and hydrogen isotopes of CH 4 and CO 2 in paddy fields along the Gulf Coast of Texas. Although only small differences in total CH4 flux (-46.5 2 3 2 13 g m-clayey and -4_ g m-sandy) and average/5 -CH 4 (seasonal averages of -56.11+1.21%o clayey and -53.57+0.97%o sandy) I¾om emitted CH4 were observed in two plots with different soil textures, by making additional measurements of belowground CH4 and CO 2 we learned much about processes occurring in the paddy field. We estimated that roughly 98% of the CH 4 released was transported through the plant and that residence times for belowground CH 4 were from about 1 to 5 hours during most of the season, indicating fast processing of both organic carbon and current photosynthesized carbon to make CH4. The percentage of CH4 made from acetate fermentation calculated using isotope data was strongly dependent on the value of the fractionation factor (or) associated with the CO2/H 2 reduction pathway for CH4 formation. Using a range of reasonable values for or, we calculated that acetate fermentation was from 67 to 80% early in the season to 29 to 60% late in the season (generally decreasing as the season progressed). Most importantly, we have strong evidence that rhizospheric CH 4 oxidation occurs in paddy fields. We have developed a semiempirical equation and used it to calculate the percent of CH4 oxidized as a function of total CH 4 produced from field measurements of 513CH4 under natural conditions. Because most emitted CH 4 is transported by the rice plant, it was necessary to determine the isotopic fractionation CH4 underwent during its transport through the plant. This value, 12_+1%o, was used to calculate oxidation percent using belowground and emitted/513CH4 values. In Texas, oxidation of CH4 in the soil increased from -20 to -60% over the 6 week period just prior to harvest.

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“…Large values of pore organization as in the forest and woodland sites at similar air-filled porosity indicate macropores which are not only of greater size but also well-interconnected and in the shape of channels and fissures [Blackwell et al, 1990]. This would correspond to the structure described by Bender and Conrad [1994] as having a significant content of "wide" pores, which was considered by these authors to favor methanotrophic bacteria and high CH 4 oxidation rates. The highest pore organization was at Glentress (Table 2), possibly a result of the presence of peat in the 0-150 mm layer.…”

Section: Impact Of Land Usementioning

confidence: 83%

The influence of gas transport and porosity on methane oxidation in soils

Ball¹,

Dobbie²,

Parker³

et al. 1997

J. Geophys. Res.

113

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Abstract. Two porosity-dependent parameters that affect gas transport in soils, gas diffusivity and air permeability, were assessed as possible indicators of methane oxidation rates. Soil gas diffusivity was measured in intact cores in the laboratory and in situ, and air permeability was measured in intact cores. An in situ method of measuring gas diffusivity was specifically modified for this purpose to use Freon in a portable probe. A laboratory (core) method of measuring gas diffusivity, using krypton 85, was also employed. Measurements were made at the soil surface and at a range of depths within the topsoil, in conjunction with in situ measurements of CH 4 oxidation, in forest, arable, and set-aside soils at a lowland site and in a forest soil at an upland site, in southeast Scotland. The surface layer of soil caused marked variations in diffusivity measurements, particularly with the in situ method. At the upland site, where a 50-mm-thick surface organic layer was present, the in situ technique revealed a sharp decrease in diffusivity with depth. Only where gas transport was low, in the set-aside soil, was methane oxidation rate influenced by gas transport changes associated with increasing soil water content. Differences in CH 4 oxidation rates related better to core gas diffusivities than to in situ diffusivities. The relationship was best at 50-150 mm depth where diffusivities were lower than at the surface. Air permeability, which is affected more by soil structure than diffusivity, appeared to be as relevant as the latter parameter to CH 4 oxidation rate, particularly for land use changes associated with agriculture. Thus CH 4 oxidation rate appears to be influenced by gas transport properties and soil structure, either at the surface in the litter layer or below the surface where the oxidizing microorganisms are likely to occur. ferent depths. We also assessed the suitability of the in situ technique in soils where gas transport varied with depth because of the presence of organic surface layers. Air permeability and porosity were also measured on intact cores, using laboratory techniques.We also measured transport properties on several occasions at one site, in order to estimate the importance of temporal variation in soil transport properties for CH 4 uptake. Methods and Materials Sites and SoilsMeasurements were made at two sites in southeast Scotland. Measurement TechniquesGas diffusivity was measured either in situ or in the laboratory on core samples.In situ diffusivity was measured using the method of Ball et al. [1994] but modified to use Freon 22 as diffusing gas instead of 85Kr. This modification involved the construction of a probe similar to the original but containing a small semiconductor gas sensor instead of a Geiger-M011er detector. The sensor is a hollow cylinder 3.5 mm long and 1.2 mm in overall diameter mounted horizontally within a gas cell of diameter 66 mm and length 70 mm. The sensor, which is coated with activated tin dioxide and is specific to Freons, was calibrated separa...

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Methane oxidation activity in various soils and freshwater sediments: Occurrence, characteristics, vertical profiles, and distribution on grain size fractions

Cited by 156 publications

References 48 publications

Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Methane oxidation and pathways of production in a Texas paddy field deduced from measurements of flux, δ^l3C, and δD of CH₄

The influence of gas transport and porosity on methane oxidation in soils

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Methane oxidation activity in various soils and freshwater sediments: Occurrence, characteristics, vertical profiles, and distribution on grain size fractions

Cited by 156 publications

References 48 publications

Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Termites Facilitate Methane Oxidation and Shape the Methanotrophic Community

Methane oxidation and pathways of production in a Texas paddy field deduced from measurements of flux, δl3C, and δD of CH4

The influence of gas transport and porosity on methane oxidation in soils

Contact Info

Product

Resources

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Methane oxidation and pathways of production in a Texas paddy field deduced from measurements of flux, δ^l3C, and δD of CH₄