Methane oxidation in response to iron reduction-oxidation metabolism in tropical soils

Mohanty, Santosh Ranjan; Bandeppa, G. S.; Dubey, Garima; Ahirwar, Usha; Patra, A. K.; Kollah, Bharati

doi:10.1016/j.ejsobi.2016.08.007

Cited by 16 publications

(4 citation statements)

References 35 publications

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“…The significant change in WTD, SWC, and pH not only determines soil redox potential for CH 4 production but also controls substrate and nutrient availability by influencing biogeochemical cycles. Besides the environmental factors considered in this study, other environmental variables, such as the oxygen availability and concentration of metal ions (e.g., Fe 3+ , Mn 4+ , and SO 4 2− ) in the soil profile and different vegetation, are also reported as critical factors influencing CH 4 emission and methane-cycling microorganisms [55][56][57][58]. These observations may account for the unexplained variance of methanogen/methanotroph-environment relationship in this study.…”

Section: Environmental Controls On Ch 4 -Cycling Microorganismsmentioning

confidence: 70%

Changes in Methane Emission and Community Composition of Methane-Cycling Microorganisms Along an Elevation Gradient in the Dongting Lake Floodplain, China

et al. 2020

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Methane (CH4) emission and environmental controls of CH4-cycling microorganisms are unclear in inland floodplains. Here, we examined soil CH4 emissions and the community composition of CH4-cycling microorganisms under three vegetation types—mudflat (MF, no vegetation cover), Carex meadow (CM, mainly Carex brevicuspis), and reed land (RL, mainly Miscanthus sacchariflorus)—from water-adjacent areas to higher-elevation land in the Dongting Lake floodplain, China. The results showed that CH4 emission is the highest in CM, while significant absorption was observed in the RL site. The abundance ratio of methanogen/methanotroph was the highest in CM, intermediate in MF, and lowest in RL. The Methanosarcinaceae family represented the dominant methanogens in the three sampling sites (41.32–75.25%). The genus Methylocystis (60.85%, type II methanotrophs) was dominant in CM, while Methylobacter and Methylosarcina (type I methanotrophs) were the dominant genera in MF (51.00%) and RL (50.24%), respectively. Structural equation model analysis showed that methanogen and methanotroph abundance were affected by water table depth, soil water content, and pH indirectly through soil organic content, total nitrogen, microbial biomass carbon, and microbial biomass nitrogen. These results indicated that the Dongting Lake floodplain may change from a CH4 source to a CH4 sink with vegetation succession with an increase in elevation, and the methanogen/methanotroph ratio can be used as a proxy for CH4 emission in wetland soils. The continuous increase in reed area combined with the decrease in Carex meadow may mitigate CH4 emission and enhance the CH4 sink function during the non-flood season in the Dongting Lake floodplain.

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Section: Environmental Controls On Ch 4 -Cycling Microorganismsmentioning

confidence: 70%

Changes in Methane Emission and Community Composition of Methane-Cycling Microorganisms Along an Elevation Gradient in the Dongting Lake Floodplain, China

et al. 2020

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“…Generally, methanotrophic activity is aerobic in nature, justifying high CH 4 consumption in the upper soil layer. The values of the rate of CH 4 consumption match with our previous studies (Mohanty et al ., 2017). No-tillage exhibited higher CH 4 consumption than conventional tillage.…”

Section: Discussionmentioning

confidence: 99%

“…The CH 4 concentration in the headspaces of serum bottles was analysed using a gas chromatograph (CIC, India) equipped with an FID and a Porapak Q column (2-m length, diameter 2/8”, 80/100 mesh, stainless steel column) as described elsewhere (Mohanty et al ., 2017). The injector, column and detector were maintained at 120, 60 and 300°C, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Primers targeting pmoA gene (particulate methane monooxygenase) of methanotrophs were used to quantify their abundance. The primers for pmoA were A189F (5- GGN GAC TGG GAC TTCT GG-3) and mb661R (5- CCG GMG CAA CGT CYT TAC C-3) (Mohanty et al ., 2017). This primer set targets methanotrophs covering both type I and II including Methylobacter or Methylosarcina, Methylococcus, Methylosinus group, Methylocapsa, Nitrosococcus.…”

Section: Methodsmentioning

confidence: 99%

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Methane consumption potential of soybean-wheat, maize-wheat and maize-gram cropping systems under conventional and no-tillage agriculture in a tropical vertisol

et al. 2020

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Methane (CH4) consumption in agricultural soil is imperative for the mitigation of climate change. However, the effect of tillage and cropping systems on CH4 consumption is less studied. Experiments were carried out in Madhya Pradesh, India with soybean-wheat (SW), maize-wheat (MW) and maize-gram (MG) cropping systems under conventional tillage (CT) and no-tillage (NT). Soybean/maize was cultivated during the kharif season (July–October) and wheat/chickpea in the rabi season (October–March) for 9 years consecutively. Soil samples were collected during vegetative growth stages of soybean and maize from different cropping systems. Methane consumption, the abundance of methanotrophs as particulate methane monooxygenase (pmoA) gene copies, soil and crop parameters were estimated. Methane consumption rate was higher in NT and upper soil layer (0–5 cm) than CT and 5–15 cm depth. Methane consumption rate k ranged from 0.35 to 0.56 μg CH4 consumed/g soil/d in the order of MW>SW>MG in 0–5 cm. The abundance of pmoA gene copies ranged from 43 × 104/g soil to 13 × 104/g soil and was highest in MW-NT and lowest in MG-CT. Available nitrogen, phosphorus and potassium were higher in 0–5 cm than in 5–15 cm depth. Soil and plant parameters and abundance of pmoA genes correlated significantly and positively with CH4 consumption rate. No-tillage stimulated CH4 consumption compared to CT irrespective of cropping system and CH4 consumption potential was highest in MW and lowest in MG. However, the magnitude of the positive effect of NT towards CH4 consumption was higher in SW and MG than MW.

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Microbial Cycling of Greenhouse Gases and Their Impact on Climate Change

Kollah

Patra

Mohanty

2018

Advances in Soil Microbiology: Recent Trends and Future Prospects

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Methane oxidation in response to iron reduction-oxidation metabolism in tropical soils

Cited by 16 publications

References 35 publications

Changes in Methane Emission and Community Composition of Methane-Cycling Microorganisms Along an Elevation Gradient in the Dongting Lake Floodplain, China

Changes in Methane Emission and Community Composition of Methane-Cycling Microorganisms Along an Elevation Gradient in the Dongting Lake Floodplain, China

Methane consumption potential of soybean-wheat, maize-wheat and maize-gram cropping systems under conventional and no-tillage agriculture in a tropical vertisol

Microbial Cycling of Greenhouse Gases and Their Impact on Climate Change

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