Significance of anaerobic oxidation of methane (AOM) in mitigating methane emission from major natural and anthropogenic sources: a review of AOM rates in recent publications

Gao, Yaohuan; Wang, Yong; Lee, Hyung-Sool; Jin, Pengkang

doi:10.1039/d2va00091a

Cited by 15 publications

(6 citation statements)

References 257 publications

(507 reference statements)

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“…Anaerobic oxidation of CH 4 : Mechanistic studies may want to include anaerobic oxidation of CH 4 (often referred to as ‘AOM’), the process whereby CH 4 is converted to CO 2 using alternate electron acceptors such as SO 4 2− , NO 3 − , metals, or soil organic matter (Gao et al 2022 ), as opposed to aerobic CH 4 oxidation which uses O 2 as an electron acceptor. AOM has long been known to be an important process in marine coastal wetlands with high availability of SO 4 2− (Knittel and Boetius 2009 ; Segarra et al 2015 ).…”

Section: Carbon Fluxesmentioning

confidence: 99%

“…AOM has long been known to be an important process in marine coastal wetlands with high availability of SO 4 2− (Knittel and Boetius 2009 ; Segarra et al 2015 ). AOM can also influence freshwater wetlands (Martinez-Cruz et al 2018 ; Gao et al 2022 ). Thus, even under anaerobic conditions, observed net CH 4 production is the balance between methanogenesis and methanotrophy.…”

Section: Carbon Fluxesmentioning

confidence: 99%

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Practical Guide to Measuring Wetland Carbon Pools and Fluxes

Bansal,

Creed,

Tangen

et al. 2023

Wetlands

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Wetlands cover a small portion of the world, but have disproportionate influence on global carbon (C) sequestration, carbon dioxide and methane emissions, and aquatic C fluxes. However, the underlying biogeochemical processes that affect wetland C pools and fluxes are complex and dynamic, making measurements of wetland C challenging. Over decades of research, many observational, experimental, and analytical approaches have been developed to understand and quantify pools and fluxes of wetland C. Sampling approaches range in their representation of wetland C from short to long timeframes and local to landscape spatial scales. This review summarizes common and cutting-edge methodological approaches for quantifying wetland C pools and fluxes. We first define each of the major C pools and fluxes and provide rationale for their importance to wetland C dynamics. For each approach, we clarify what component of wetland C is measured and its spatial and temporal representativeness and constraints. We describe practical considerations for each approach, such as where and when an approach is typically used, who can conduct the measurements (expertise, training requirements), and how approaches are conducted, including considerations on equipment complexity and costs. Finally, we review key covariates and ancillary measurements that enhance the interpretation of findings and facilitate model development. The protocols that we describe to measure soil, water, vegetation, and gases are also relevant for related disciplines such as ecology. Improved quality and consistency of data collection and reporting across studies will help reduce global uncertainties and develop management strategies to use wetlands as nature-based climate solutions.

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Section: Carbon Fluxesmentioning

confidence: 99%

Section: Carbon Fluxesmentioning

confidence: 99%

Practical Guide to Measuring Wetland Carbon Pools and Fluxes

Bansal,

Creed,

Tangen

et al. 2023

Wetlands

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“…In anoxic environments, the oxidation of CH 4 occurs mainly by methanotrophic archaea. Syntrophic consortia of methanotrophic archaea and sulphate (SO 4 2− )‐reducing bacteria (SRB) use SO 4 2− as an electron acceptor and consume 7%–25% of globally produced CH 4 (Gao et al, 2022; Knittel & Boetius, 2009). This process occurs in the sulphate–methane transition zone (SMTZ) of marine sediments (Reeburgh, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…2À as an electron acceptor and consume 7%-25% of globally produced CH 4 (Gao et al, 2022;Knittel & Boetius, 2009). This process occurs in the sulphate-methane transition zone (SMTZ) of marine sediments (Reeburgh, 2007).…”

Section: Introductionmentioning

confidence: 99%

Anaerobic methanotrophy is stimulated by graphene oxide in a brackish urban canal sediment

Pelsma,

van Helmond,

Lenstra

et al. 2023

Environmental Microbiology

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Anthropogenic activities are influencing aquatic environments through increased chemical pollution and thus are greatly affecting the biogeochemical cycling of elements. This has increased greenhouse gas emissions, particularly methane, from lakes, wetlands, and canals. Most of the methane produced in anoxic sediments is converted into carbon dioxide by methanotrophs before it reaches the atmosphere. Anaerobic oxidation of methane requires an electron acceptor such as sulphate, nitrate, or metal oxides. Here, we explore the anaerobic methanotrophy in sediments of three urban canals in Amsterdam, covering a gradient from freshwater to brackish conditions. Biogeochemical analysis showed the presence of a shallow sulphate–methane transition zone in sediments of the most brackish canal, suggesting that sulphate could be a relevant electron acceptor for anaerobic methanotrophy in this setting. However, sediment incubations amended with sulphate or iron oxides (ferrihydrite) did not lead to detectable rates of methanotrophy. Despite the presence of known nitrate‐dependent anaerobic methanotrophs (Methanoperedenaceae), no nitrate‐driven methanotrophy was observed in any of the investigated sediments either. Interestingly, graphene oxide stimulated anaerobic methanotrophy in incubations of brackish canal sediment, possibly catalysed by anaerobic methanotrophs of the ANME‐2a/b clade. We propose that natural organic matter serving as electron acceptor drives anaerobic methanotrophy in brackish sediments.

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“…AOM coupled with sulfate reduction consumes 90% of the methane produced in the sediments and 70% of the sulfate diffused into the sediments [8]. The SR-AOM process acts as an effective methane barrier, minimizing the released methane escape into the atmosphere [9]. The efficiency of AOM is affected by natural factors such as changes in temperature and sulfate concentration [10,11].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic oxidation of methane with conditions of increased temperature and extra sulfate supply

Liang,

Feng,

Zhang

et al. 2023

Preprint

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Anaerobic oxidation of methane (AOM) coupled with sulfate reduction (SR) is an important process in cold-seep ecosystems to prevent methane emitted from the seafloor to the atmosphere. However, how the temperature and sulfate in seep habitats drive the SR-AOM process and further affect the methane cycles remains unknown. We simulated the habitat differences in sulfate and temperature using a high-pressure bioreactor system with a fed-batch mode for in vitro incubation of seep sediment. We found that SR-AOM was significantly affected by increased temperature (15°C). The AOM activity was increased by sulfate supply (+15 mM), even at a low temperature (8°C). Our findings provide a new insight into the methane budget in cold seeps.

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Significance of anaerobic oxidation of methane (AOM) in mitigating methane emission from major natural and anthropogenic sources: a review of AOM rates in recent publications

Abstract: AOM rates in literature were analyzed and anaerobic methanotrophs significantly cut methane emissions in oceans but not in wetlands, rice paddy, and fresh water. The trophic and metabolic patterns of microorganisms may be limiting the AOM rates.

Cited by 15 publications

References 257 publications

Practical Guide to Measuring Wetland Carbon Pools and Fluxes

Practical Guide to Measuring Wetland Carbon Pools and Fluxes

Anaerobic methanotrophy is stimulated by graphene oxide in a brackish urban canal sediment

Anaerobic oxidation of methane with conditions of increased temperature and extra sulfate supply

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