Methane emission during wood fungal decomposition

Мухин, В. А.; Voronin, P. Yu.

doi:10.1134/s0012496607020202

Cited by 20 publications

(16 citation statements)

References 3 publications

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“…For example, Mukhin and Voronin 27 reported a wood decay-associated CH 4 formation caused by fungi in boreal forests. These authors suggested that fungi were not directly involved in the synthesis of CH 4 but they were necessary for its formation, by starting the food chain that leads to CH 4 -producing archaea 14 . Thus, they regarded it as a symbiotic association of wood-decaying fungi and anaerobic methanogenic microorganisms 28 but did not present any evidence for this mechanism.…”

Section: Discussionmentioning

confidence: 99%

“…Fungi occupy a key role in degradation processes, representing an important part of the soil biome, and mycorrhizal fungi establish a close symbiosis with plant roots. Fungi have already been identified as members of a methanogenic food chain by providing methanogenic archaea with their substrate 14,15 , but they have to date not been reported to produce CH 4 per se. It is known that diverse bacteria can inhabit fungal mycelia [16][17][18] , but no methanogenic archaea have been found as endosymbionts in fungi.…”

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confidence: 99%

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Evidence for methane production by saprotrophic fungi

et al. 2012

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methane in the biosphere is mainly produced by prokaryotic methanogenic archaea, biomass burning, coal and oil extraction, and to a lesser extent by eukaryotic plants. Here we demonstrate that saprotrophic fungi produce methane without the involvement of methanogenic archaea. Fluorescence in situ hybridization, confocal laser-scanning microscopy and quantitative realtime PCR confirm no contribution from microbial contamination or endosymbionts. our results suggest a common methane formation pathway in fungal cells under aerobic conditions and thus identify fungi as another source of methane in the environment. stable carbon isotope labelling experiments reveal methionine as a precursor of methane in fungi. These findings of an aerobic fungus-derived methane formation pathway open another avenue in methane research and will further assist with current efforts in the identification of the processes involved and their ecological implications.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Evidence for methane production by saprotrophic fungi

et al. 2012

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“…There are no published reports of in situ wood CH 4 concentrations from wetland forests, to our knowledge. CH 4 can accumulate to very high concentrations in upland trees (Mukhin & Voronin, ; Covey et al ., ; Hietala et al ., ), in some cases reaching > 65% of total stem gas (Bushong, ). These high concentrations explain dramatic images of flaming trees (Fig.…”

Section: Tree Ch4 Fluxesmentioning

confidence: 99%

Methane production and emissions in trees and forests

2019

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Forest ecosystem methane (CH 4 ) research has focused on soils, but trees are also important sources and sinks in forest CH 4 budgets. Living and dead trees transport and emit CH 4 produced in soils; living trees and dead wood emit CH 4 produced inside trees by microorganisms; and trees produce CH 4 through an abiotic photochemical process. Here, we review the state of the science on the production, consumption, transport, and emission of CH 4 by living and dead trees, and the spatial and temporal dynamics of these processes across hydrologic gradients inclusive of wetland and upland ecosystems. Emerging research demonstrates that tree CH 4 emissions can significantly increase the source strength of wetland forests, and modestly decrease the sink strength of upland forests. Scaling from stem or leaf measurements to trees or forests is limited by knowledge of the mechanisms by which trees transport soil-produced CH 4 , microbial processes produce and oxidize CH 4 inside trees, a lack of mechanistic models, the diffuse nature of forest CH 4 fluxes, complex overlap between sources and sinks, and extreme variation across individuals. Understanding the complex processes that regulate CH 4 source-sink dynamics in trees and forests requires cross-disciplinary research and new conceptual models that transcend the traditional binary classification of wetland vs upland forest.

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“…In terms of environmental impact, decomposition of wood material is accompanied by emissions of greenhouse gases, namely CO 2 and CH 4 [10,33] The characteristics of wood waste leachate are known to depend on the tree species, its state of degradation and volume, and the degree of contact between the percolating water and wood. In general, the main environmental concerns related to the leachate are high loads of organic substances, causing oxygen depletion and toxicity, and the P content, which contributes to eutrophication of surface waters [12,37].…”

Section: Discussionmentioning

confidence: 99%

The Effects of Mixing Pulp and Paper Mill Sludge into Wood Bark on Storage-Related Environmental Impacts and Heating Value

et al. 2021

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The pulping industry generates vast amounts of bark residues and wastewater treatment sludges, which are combined and stored for varying periods in stacks, often in the open air, prior to utilization for energy via combustion. In order to optimize the storage strategy, the effects of incorporating sludge into bark on heating value and storage-related environmental impacts were investigated in laboratory and outdoor studies. Biological degradation activity was found to be higher in treatments containing 25% sludge (B75S25) and 50% sludge (B50S50) on a fresh mass basis, in comparison with pure bark (B100). Mean monthly dry mass loss was 2.1% (B100), 3.3% (B75S25), and 3.7% (B50S50) in the laboratory and 2.7%, 4.2%, and 4.8%, respectively, outdoors. Sludge addition was found to maintain degradation activity at low temperatures (+ 3°C). Co-storage of sludge and bark led to loss of energy, mainly due to increased loss of biomass and increased moisture content. Overall, biomass moisture content governed the heating value.Cumulative methane emissions over the storage period were higher from the sludge-containing treatments than from pure bark, but emissions of nitrogen-containing gases (N 2 O and NH 3 ) were negligible throughout. Sludge addition roughly halved the cumulative chemical oxygen demand (COD) of leachate and minimized its concentration of phosphate-P. However, larger amounts of inorganic elements were released to the percolating water from the sludge-containing treatments. Overall, these results indicate that nding alternative uses for the sludge fraction would be bene cial. Novelty StatementThe background of this study has been to nd out more information about the e uent treatment derived sludge interaction with bark when stored together. This has been the traditional method in the industry, where most of the sludge is still burned together with the biomass, usually bark. The need to increase the knowledge of this topic has come from the pulp industry.

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Methane emission during wood fungal decomposition

Cited by 20 publications

References 3 publications

Evidence for methane production by saprotrophic fungi

Evidence for methane production by saprotrophic fungi

Methane production and emissions in trees and forests

The Effects of Mixing Pulp and Paper Mill Sludge into Wood Bark on Storage-Related Environmental Impacts and Heating Value

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