Emission of highly <sup>13</sup>C‐depleted methane from an upland blanket mire

Bowes, H. L.; Hornibrook, Edward R. C.

doi:10.1029/2005gl025209

Cited by 24 publications

(24 citation statements)

References 25 publications

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“…(station A) relative to the dominant vascular flora (station B). Detailed descriptions of the flux chambers, ground collars and membrane equilibrators were reported by Bowes and Hornibrook [2006]. Briefly, all three items were constructed of polyvinyl chloride (PVC).…”

Section: Site Description and Methodsmentioning

confidence: 99%

“…Methane emissions from the minerotrophic mires were markedly 13 C values, which relate to improvements in emission sampling techniques, are described by Bowes and Hornibrook [2006].…”

mentioning

confidence: 99%

“…13 C values of CH 4 flux because the majority of CH 4 released to the atmosphere was transport by passive diffusion through aerenchymatous tissue [Bowes and Hornibrook, 2006].…”

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confidence: 99%

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Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Hornibrook

Bowes

2007

Geophysical Research Letters

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The influence of trophic status on CH4 production, emission and stable carbon isotope composition was investigated in two ombrogenous and two minerotrophic peatlands situated in Wales, UK. Methane production and emission rates were highest in the minerotrophic peatlands and CH4 in both pore water and emissions to the atmosphere were notably 13C‐enriched compared to the ombrogenous bogs. Highly negative δ13C values (−95 to −82‰) for CH4 flux from the acidic rainfed peatlands likely resulted from a combination of CO2/H2 methanogenesis and isotope effects associated with diffusion of CH4 through aerenchymatous tissue of vascular flora. The δ13C values presently attributed to CH4 flux from northern wetlands in isotope‐weighted mass balance budgets of the CH4 cycle may be too positive. Methane flux from northern bogs and fens should be assigned different δ13C values because CH4 is notably more 13C‐depleted in the former, albeit emission strength typically is weaker.

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Section: Site Description and Methodsmentioning

confidence: 99%

“…Methane emissions from the minerotrophic mires were markedly 13 C values, which relate to improvements in emission sampling techniques, are described by Bowes and Hornibrook [2006].…”

mentioning

confidence: 99%

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Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Hornibrook

Bowes

2007

Geophysical Research Letters

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“…Collection methods and pore water CH 4 data for Blaen Fign were reported previously in Bowes and Hornibrook (2006). The dissolved CH 4 abundances for Crymlyn Bog, Gors Lwyd and Cors Caron are reported here for the first time.…”

Section: Pore Water Methanementioning

confidence: 99%

“…Collection methods and CH 4 flux data for all sites were reported previously in Bowes and Hornibrook (2006) and Hornibrook and Bowes (2007). Briefly, flux chambers and ground collars were constructed of polyvinyl chloride (PVC) and had a combined volume of either 11 or 15 l. The chambers were sealed onto the collars using large neoprene rubber o-rings coated with silicon grease and then covered with opaque lids also fitted with greased o-rings.…”

Section: Methane Fluxmentioning

confidence: 99%

Methanotrophy potential versus methane supply by pore water diffusion in peatlands

et al. 2009

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Abstract. Low affinity methanotrophic bacteria consume a significant quantity of methane in wetland soils in the vicinity of plant roots and at the oxic-anoxic interface. Estimates of the efficiency of methanotrophy in peat soils vary widely in part because of differences in approaches employed to quantify methane cycling. High resolution profiles of dissolved methane abundance measured during the summer of 2003 were used to quantity rates of upward methane flux in four peatlands situated in Wales, UK. Aerobic incubations of peat from a minerotrophic and an ombrotrophic mire were used to determine depth distributions of kinetic parameters associated with methane oxidation. The capacity for methanotrophy in a 3 cm thick zone immediately beneath the depth of nil methane abundance in pore water was significantly greater than the rate of upward diffusion of methane in all four peatlands. Rates of methane diffusion in pore water at the minerotrophic peatlands were small (<10%) compared to surface emissions during June to August. The proportions were notably greater in the ombrotrophic bogs because of their typically low methane emission rates. Methanotrophy appears to consume entirely methane transported by pore water diffusion in the four peatlands with the exception of 4 of the 33 gas profiles sampled. Flux rates to the atmosphere regardless are high because of gas transport through vascular plants, in particular, at the minerotrophic sites. Cumulative rainfall amount 3-days prior to sampling correlated well with the distance between the water table level and the depth of 0 µmol l −1 methane, indicating that precipitation events can impact methane distributions in pore water. Further work is needed to characterise the kinetics of methane oxidation spatially and temporally in different wetland types in order Correspondence to: E. R. C. Hornibrook (ed.hornibrook@bristol.ac.uk) to determine generalized relationships for methanotrophy in peatlands that can be incorporated into process-based models of methane cycling in peat soils.

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Differences in hydrophyte life forms induce spatial heterogeneity of CH₄ production and its carbon isotopic signature in a temperate bog peatland

et al. 2015

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To clarify the effect of differences in hydrophyte life forms on methane (CH 4 ) production and its carbon stable isotopic signature (δ 13 C-CH 4 ), we analyzed CH 4 and carbon dioxide (CO 2 ) concentrations, their stable carbon isotope values, and chemical constituents dissolved in pore water in a small floating peat bog in Japan. Because eutrophication has modified the surrounding water quality, the bog vegetation on the mat has been, in part, replaced by fen-type vegetation. We hypothesized that differences in hydrophyte habitats affect redox conditions, including dissolved oxygen (DO) in water and therefore the amounts and carbon isotopic values of CH 4 and CO 2 dissolved in pore water. Between the habitats of two Sphagnum species, DO was considerably higher, and CH 4 concentrations were significantly lower in Sphagnum cuspidatum Ehrh. habitats in hollow (DO: 0.62 ± 0.20 mg/L (standard error (SE)) and CH 4 : 0.18 ± 0.02 mmol/L) than in Sphagnum palustre L. habitats in hummock (DO: 0.29 ± 0.08 and CH 4 : 0.82 ± 0.06) in pore water (10 cm depth). Both DO and CH 4 concentrations in three vascular plant habitats (Rhynchospora fauriei Franch., Phragmites australis [reed], and Menyanthes trifoliata L.) in pore water (10 cm depth) were intermediate relative to the two Sphagnum species. However, CH 4 flux in M. trifoliata site was significantly higher than that at both Sphagnum sites, suggesting that the type of gas transport (diffusive or convective via root and stem) affected the depth profile of CH 4 concentrations and its flux. δ 13 C-CH 4 values in pore water also varied among the vegetation types, even within Sphagnum species (e.g., at 10 cm depth, δ 13 C-CH 4 : R. fauriei, À55.3 ± 1.8‰ (SE); P. australis, À57.5 ± 1.6‰; M. trifoliata, À56.7 ± 1.5‰; S. cuspidatum, À71.2 ± 1.4‰; and S. palustre, À60.4 ± 0.6‰). Our results suggest that significant differences arise in CH 4 concentration and δ 13 C-CH 4 values among the hydrophyte habitats even within a small peat bog and that change in vegetation relative to trophic conditions can affect CH 4 emissions and associated δ 13 C-CH 4 values.

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Emission of highly ¹³C‐depleted methane from an upland blanket mire

Cited by 24 publications

References 25 publications

Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Methanotrophy potential versus methane supply by pore water diffusion in peatlands

Differences in hydrophyte life forms induce spatial heterogeneity of CH₄ production and its carbon isotopic signature in a temperate bog peatland

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Emission of highly 13C‐depleted methane from an upland blanket mire

Cited by 24 publications

References 25 publications

Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Trophic status impacts both the magnitude and stable carbon isotope composition of methane flux from peatlands

Methanotrophy potential versus methane supply by pore water diffusion in peatlands

Differences in hydrophyte life forms induce spatial heterogeneity of CH4 production and its carbon isotopic signature in a temperate bog peatland

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Emission of highly ¹³C‐depleted methane from an upland blanket mire

Differences in hydrophyte life forms induce spatial heterogeneity of CH₄ production and its carbon isotopic signature in a temperate bog peatland