Methane. A review

Amstel, A. van

doi:10.1080/1943815x.2012.694892

Cited by 53 publications

(21 citation statements)

References 66 publications

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“…W etlands constitute the most significant natural source of the potent greenhouse gas methane, accounting for approximately 20% of annual global emissions (ϳ574 Tg) (1). The Florida Everglades is a large freshwater wetland in North America, covering over 8,000 km 2 .…”

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confidence: 99%

Methanogens Are Major Contributors to Nitrogen Fixation in Soils of the Florida Everglades

Bae

Morrison

Chanton

et al. 2018

Appl Environ Microbiol

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The objective of this study was to investigate the interaction of the nitrogen (N) cycle with methane production in the Florida Everglades, a large freshwater wetland. This study provides an initial analysis of the distribution and expression of N-cycling genes in Water Conservation Area 2A (WCA-2A), a section of the marsh that underwent phosphorus (P) loading for many years due to runoff from upstream agricultural activities. The elevated P resulted in increased primary productivity and an N limitation in P-enriched areas. Results from quantitative real-time PCR (qPCR) analyses indicated that the N cycle in WCA-2A was dominated by and/, with an increasing trend in copy numbers in P-impacted sites. Many sequences (6 to 44% of the total) and transcript sequences (2 to 49%) clustered with the methanogenic , in stark contrast to the proportion of core gene sequences representing (≤0.27% of SSU rRNA genes) for the WCA-2A microbiota. Notably, archaeal gene transcripts were detected at all sites and comprised a significant proportion of total transcripts obtained from the unimpacted site, indicating that methanogens are actively fixing N Laboratory incubations with soils taken from WCA-2A produced transcripts with the production of methane from H plus CO and acetate as electron donors and carbon sources. Methanogenic N fixation is likely to be an important, although largely unrecognized, route through which fixed nitrogen enters the anoxic soils of the Everglades and may have significant relevance regarding methane production in wetlands. Wetlands are the most important natural sources of the greenhouse gas methane, and much of that methane emanates from (sub)tropical peatlands. Primary productivity in these peatlands is frequently limited by the availability of nitrogen or phosphorus; however, the response to nutrient limitations of microbial communities that control biogeochemical cycling critical to ecosystem function may be complex and may be associated with a range of processes, including methane production. We show that many, if not most, of the methanogens in the peatlands of the Florida Everglades possess the gene and actively express it for N fixation coupled with methanogenesis. These findings indicate that archaeal N fixation would play crucial role in methane emissions and overall N cycle in subtropical wetlands suffering N limitation.

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mentioning

confidence: 99%

Methanogens Are Major Contributors to Nitrogen Fixation in Soils of the Florida Everglades

Bae

Morrison

Chanton

et al. 2018

Appl Environ Microbiol

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“…The most important reason for the wide range of methane emissions mentioned above is that, despite several decades of research, global methane accounting remains highly uncertain . Climate experts describe it as ‘ill quantified’ . As a consequence, the global models also show very large ranges in the distribution of the entire methane budget over the different emitters (agriculture, energy sector, natural sources) .…”

Section: Status Of Monitoring Methane Emissions From Fossil Energy Rementioning

confidence: 99%

“…18 Climate experts describe it as 'ill quantified'. 19 As a consequence, the global models also show very large ranges in the distribution of the entire methane budget over the different emitters (agriculture, energy sector, natural sources). 18 The recording of methane emissions becomes difficult particularly due to the fact that different methane sources and sinks exist and that these are distributed very heterogeneously.…”

Section: Status Of the Methane Emission Research And Global Methane Bmentioning

confidence: 99%

Influence of methane emissions on the GHG emissions of fossil fuels

Pieprzyk¹,

Hilje²

2018

Biofuels Bioprod Bioref

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Our study examines the effects of methane emissions on the greenhouse gas (GHG) emissions of crude oil and natural gas between 2015 and 2040. Our scenario calculations, derived from global methane budgets and shale analyses, provided a range of 22–59 million tons of global methane emissions from the oil sector in 2015. By 2040, the methane emissions of crude oil will increase by between 18% and 59%. For the global warming potential over 100 years (GWP100), our analysis shows venting, flaring, and fugitive (VFF) emissions of global diesel and gasoline combined of between 8.78 and 14.80 g CO2eq MJ−1 in 2015 and 8.88 to 16.34 g CO2eq MJ−1 by 2040. Our minimum average values for VVF emissions of fossil fuels are thus twice as high as those used in the calculations for the fossil reference value used in the Fuel Quality Directive of the European Union (EU‐FQD). The VVF emissions from diesel and gasoline produced from shale oil will reach up to 26.84 g CO2eq MJ−1 and from shale natural gas liquids (NGL) up to 31.84 g CO2eq MJ−1. Our maximum marginal values for the VVF emissions of fossil fuels are thus up to nine times higher than the VVF value for the EU‐FQD. Based on our calculations, the EU‐FQD reference value for conventional fossil diesel will increase from 95 g MJ−1 to between 99.16 and 105.06 g MJ−1 for the GWP100 and between 109.80 and 124.70 g MJ−1 for the global warming potential over 20 years (GWP20). Our results thus show that the previous reference values for fossil fuels are clearly too low because their assumptions for methane emissions are far too low. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…During anaerobic OM degradation, water systems release major GHGs, namely carbon dioxide (CO 2 ), CH 4 and nitrous oxide (N 2 O) [30] [31] [32] [33]. Few studies directly measure GHG emissions with floating chambers and the dissolved forms [34] [35] [36] [37].…”

Section: Gas By-products Of Self-purificationmentioning

confidence: 99%

Bioremediation in Water Environment: Controlled Electro-Stimulation of Organic Matter Self-Purification in Aquatic Environments

Jobin¹,

Namour²

2017

AiM

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This review describes a new means of control and stimulation of microorganisms involved in the bioremediation of sediments and waterlogged soils. This emerging technology is derived from sedimentary microbial fuel cells, and consists in ensuring aerobic respiration of aerobic microbial populations in anaerobic conditions by means of a fixed potential anode in order to evacuate the electrons coming from the microbial respiratory chains. This review describes the conceptual basis of the electro-bioremediation, the material devices used (electrode set-ups and spacing), and finally studies the various devices published since the bench tests until the scarce in-field implementations.

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Methane. A review

Cited by 53 publications

References 66 publications

Methanogens Are Major Contributors to Nitrogen Fixation in Soils of the Florida Everglades

Methanogens Are Major Contributors to Nitrogen Fixation in Soils of the Florida Everglades

Influence of methane emissions on the GHG emissions of fossil fuels

Bioremediation in Water Environment: Controlled Electro-Stimulation of Organic Matter Self-Purification in Aquatic Environments

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