Release of methane from aerobic soil: An indication of a novel chemical natural process?

Hurkuck, Miriam; Althoff, Frederik; Jungkunst, Hermann F.; Jugold, Alke; Keppler, Frank

doi:10.1016/j.chemosphere.2011.11.024

Cited by 33 publications

(42 citation statements)

References 24 publications

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“…There is also the potential for short-term (but intense) CH 4 generation in normally oxic soils that get flooded for a brief period (e.g., 2-3 weeks) due to spring thaw or raising of the water table due to heavy rains, as has been shown in eastern Canada (Ullah and Moore, 2011), in Canadian prairie soils (Wang and Bettany, 1997), and in grassland soils in Germany (Kammann et al, 2001). Other possible mechanisms that could form methane in oxic soils include the existence of anaerobic micro-environments (Kammann et al, 2009) or abiotic processes (Hurkuck et al, 2011). According to Kammann et al (2001), CH 4 production in the subsoil may be more common than previously thought in non-aquatic systems, as they found CH 4 concentrations as high as 235 ppm at 30 cm depth after heavy fall rains.…”

Section: Methanementioning

confidence: 94%

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Beaubien

Jones

Gal

et al. 2013

International Journal of Greenhouse Gas Control

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Section: Methanementioning

confidence: 94%

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Beaubien

Jones

Gal

et al. 2013

International Journal of Greenhouse Gas Control

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“…In addition, as with photodegradation, moisture is another key regulating factor during thermal degradation. This is exemplified by the impacts of moisture on NM‐CH 4 production from soils (Hurkuck et al., ; Wang, Hou, et al., ) and dried leaves (Fig. S1).…”

Section: Unifying Mechanismsmentioning

confidence: 95%

Widespread production of nonmicrobial greenhouse gases in soils

Wang

Lerdau

2017

Global Change Biology

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Carbon dioxide (CO ), methane (CH ), and nitrous oxide (N O) are the three most important greenhouse gases (GHGs), and all show large uncertainties in their atmospheric budgets. Soils of natural and managed ecosystems play an extremely important role in modulating their atmospheric abundance. Mechanisms underlying the exchange of these GHGs at the soil-atmosphere interface are often assumed to be exclusively microbe-mediated (M-GHGs). We argue that it is a widespread phenomenon for soil systems to produce GHGs through nonmicrobial pathways (NM-GHGs) based on a review of the available evidence accumulated over the past half century. We find that five categories of mechanistic process, including photodegradation, thermal degradation, reactive oxidative species (ROS) oxidation, extracellular oxidative metabolism (EXOMET), and inorganic chemical reactions, can be identified as accounting for their production. These pathways are intricately coupled among themselves and with M-GHGs production and are subject to strong influences from regional and global change agents including, among others, climate warming, solar radiation, and alterations of atmospheric components. Preliminary estimates have suggested that NM-GHGs could play key roles in contributing to budgets of GHGs in the arid regions, whereas their global importance would be enhanced with accelerated global environmental changes. Therefore, more research should be undertaken, with a differentiation between NM-GHGs and M-GHGs, to further elucidate the underlying mechanisms, to investigate the impacts of various global change agents, and to quantify their contributions to regional and global GHGs budgets. These efforts will contribute to a more complete understanding of global carbon and nitrogen cycling and a reduction in the uncertainty of carbon-climate feedbacks in the Earth system.

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“…, Hurkuck et al. ), an examination of the stable isotope signatures of CH 4 emitted from plant material and compounds suggested that there are likely multiple sources for photochemical emission of CH 4 (Vigano et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Hurkuck et al. () found that thermal emission of CH 4 from lignin and pectin both increased exponentially from 30°C to 70°C, with the emission rate from lignin being roughly twice that from pectin at 70°C. Several others have documented photochemical CH 4 emission from pectins (McLeod et al.…”

Section: Introductionmentioning

confidence: 99%

Thermal abiotic emission of CO₂ and CH₄ from leaf litter and its significance in a photodegradation assessment

et al. 2019

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Photodegradation has been recognized as a significant driver of plant litter decomposition in drylands. Another potential driver is the thermal emission of trace gases that occurs in the absence of solar radiation and microbial activity. Most field assessments documenting photodegradation have employed filters that absorb solar radiation, along with transparent filter controls; faster litter decay under transparent filters is taken as evidence of photodegradation. However, the temperature of litter under transparent filters is often higher, and its faster decay might conceivably stem from greater thermal emission, rather than photodegradation. If true, the growing consensus that photodegradation is a significant driver of litter decay needs rethinking. We assessed the contribution of thermal emission of CO2 and CH4 to the C loss of 12 litter types over a 34‐month photodegradation study in the Sonoran Desert by quantifying thermal emission responses and using field litter temperatures to estimate emissions. Emission of both gases from litter increased exponentially with temperature. Emission of CO2 was much greater than CH4, but their rates were strongly correlated. Concentrations of surface waxes and dissolved organic C in litter were strong predictors of emission of both gases. Emission declined from dried green leaves to naturally senesced litter, and as litter decayed. Diurnal litter temperature averaged 39.8°C under transparent filters over the field experiment and averaged 1.7°C higher than that of litter under filters that absorbed UV through blue solar wavelengths. Through all mechanisms, litter lost an average of 77.8% of its original C under transparent filters and 60.8% under filters that absorbed UV through blue wavelengths. However, thermal emission of these gases accounted for only 0.8% of the original C in litter under transparent filters and 1.0% under filters that absorbed UV through blue wavelengths, corresponding to only 1.2% and 2.0% of the total C lost from litter. While litter temperatures were higher under transparent filters, thermal emission losses from this litter were lower because emission from this litter declined faster with decay. We conclude that thermal abiotic emission was a minor C loss pathway and that photodegradation was responsible for the faster decay of litter in sunlight.

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Release of methane from aerobic soil: An indication of a novel chemical natural process?

Cited by 33 publications

References 24 publications

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Widespread production of nonmicrobial greenhouse gases in soils

Thermal abiotic emission of CO₂ and CH₄ from leaf litter and its significance in a photodegradation assessment

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Release of methane from aerobic soil: An indication of a novel chemical natural process?

Cited by 33 publications

References 24 publications

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Monitoring of near-surface gas geochemistry at the Weyburn, Canada, CO2-EOR site, 2001–2011

Widespread production of nonmicrobial greenhouse gases in soils

Thermal abiotic emission of CO2 and CH4 from leaf litter and its significance in a photodegradation assessment

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Thermal abiotic emission of CO₂ and CH₄ from leaf litter and its significance in a photodegradation assessment