Methane emission, methanogenic and methanotrophic communities during rice-growing seasons differ in diversified rice rotation systems

Jiang, Mengdie; Xu, Peng; Wu, Lianghuan; Zhao, Jinsong; Wu, Hongtao; Lin, Shan; Yang, Tewu; Tu, Junming; Hu, Ronggui

doi:10.1016/j.scitotenv.2022.156781

Cited by 19 publications

(14 citation statements)

References 53 publications

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“…5). The detected dominantly methanogens in the soils coincided with previous research in rice fields (Jiang et al, 2022;Wang et al, 2021). Among the different cropping modes, unique geographical features determined that the soil pH of the RF soil was significantly higher than that of RW and RF soils (Table 1).…”

Section: Effect On Methanogenic Communitiessupporting

confidence: 86%

“…Different cropping modes in paddy fields directly affected carbon input, e.g., root stubble and the content of root exudate ( (Jiang et al, 2022), and these soil organic matter and soil organic acids were the important methanogenic precursors (Ding and Cai, 2002;Glissmann and Conrad, 2002). In theory, both DR and RW were planted with crops harvested twice a year (Zhang et al, 2017), resulting in more readily available root stubble and root exudate than RF soil.…”

Section: Effect On Mppmentioning

confidence: 99%

“…In theory, DR mode, a biannual rice cultivation mode, had higher residual carbon (stubble and root), organic acid remaining, and more favorable anaerobic conditions for methanogens in the soil. It will inevitably lead to the release of more liable carbon (DOC) and acetate by residual decomposition (Jiang et al, 2022), thus potentially supplying sufficient available substrates for methanogen and increasing the abundance of mcrA gene.…”

Section: Effect On Methanogenic Communitiesmentioning

confidence: 99%

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Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Shen

Huang

et al. 2022

Preprint

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Microbial methane (CH4) production and emission are various in different paddy fields. However, little is known about values of anaerobically produced δ13CH4, methanogenic pathways, and their dominant communities in different paddy soils. Through anaerobic incubation experiments and the stable carbon isotope with fluoromethane inhibitor method, CH4 production potential (MPP), the relative contribution of acetoclastic methanogenesis (fac), and the abundance and community composition of methanogens in paddy soils were measured under three typical cropping modes (Rice-Wheat, RW; Rice-Fallow, RF; Double-Rice, DR) in China. The results showed that MPP was 13.4 μg CH4 g–1 d–1 in DR soil, 23% and 46% higher than that in RW and RF soils, respectively. Moreover, RF soil had the highest produced δ13CH4 value (–43.9‰) and the lowest produced δ13CO2 value (–26.3‰). Based on the isotope fractionations associated with H2/CO2-dependent methanogenesis (1.049–1.062), fac values in RF soil (80–98%) were much higher than that in RW (39–60%) and DR (52–75%) soils. Compared to RF soil, mcrA gene abundance in RW and DR soils increased by 29% and 40%, respectively. Furthermore, the dominant methanogens in RF soil were Methanosarcina (acetoclastic methanogens) while Methanosarcina and Methanobacterium (hydrogenotrophic methanogens) were in RW and DR soils. Redundancy analysis revealed that soil pH and soil texture affected the community structure of methanogens. These findings suggest that differences in paddy MPP and methanogenic pathways under the three typical cropping modes might be caused by the changes in methanogenic abundance and community composition driven by soil pH.

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Section: Effect On Methanogenic Communitiessupporting

confidence: 86%

Section: Effect On Mppmentioning

confidence: 99%

Section: Effect On Methanogenic Communitiesmentioning

confidence: 99%

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Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Shen

Huang

et al. 2022

Preprint

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“…Soil organic matter and soil organic acids are the important precursors of methanogenesis for consumption by methanogens (Ding and Cai, 2002;Glissmann and Conrad, 2002). They are mainly derived from carbon input, e.g., root stubble and the content of root exudate that is affected by cropping modes (Jiang et al, 2022). In theory, both DR and RW were planted with crops harvested twice a year (Zhang et al, 2017), resulting in more readily available root stubble and root exudate than RF soil.…”

Section: Effect On Mppmentioning

confidence: 99%

“…However, most of the previous studies on CH 4 production and methanogenic pathway in Chinese paddy soils have focused on the RW cropping mode (Zhang et al, 2011;Zhang et al, 2012), and little is known about RF and DR soils with high CH 4 emissions and large emission reduction potential (Cai et al, 2000;Chen et al, 2013). Furthermore, paddy soils under different cropping modes have various methanogenic communities due to their specific soil conditions, which leads to changes in methanogenic pathways (Jiang et al, 2022;Zhang et al, 2017). However, there is no clear information so far on the targeted comparative study about the microbiological mechanisms between methanogenesis pathways and environmental factors in paddy soils under different cropping modes.…”

Section: Introductionmentioning

confidence: 99%

Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Shen

Huang

et al. 2023

Preprint

View full text Add to dashboard Cite

Microbial methane (CH4) production varies among different cropping modes,which has important implications for how to reduce CH4 emissions from paddy fields.However,little is known about the values of anaerobically produced δ13CH4,methanogenic pathways,and their dominant communities in different paddy soils.Through anaerobic incubation experiments and the stable carbon isotope with fluoromethane inhibitor method,CH4 production potential (MPP), the relative contribution of acetoclastic methanogenesis(fac),and the abundance and community composition of methanogens in paddy soils were measured under three typical cropping modes (Rice-Wheat,RW;Rice-Fallow,RF;Double-Rice,DR) in China. The results showed that MPP was 30.7 μg CH4 g–1 d–1 in DR soil,57% and 66% higher than that in RW and RF soils,respectively,possibly due to the lower pH and higher abundance of mcrA genes. Moreover,RF soil had the highest produced δ13CH4 value(–43.9‰) and the lowest produced δ13CO2 value(–26.3‰). Based on the carbon isotope fractionations associated with H2/CO2-dependent methanogenesis(1.049–1.062), the values of fac estimated in RF soil(80–98%)were much higher than that in RW(39–60%) and DR(52–75%) soils. It might be supported by that the Methanosarcina (acetoclastic methanogens) were dominant in RF soil while Methanosarcina and Methanobacterium(hydrogenotrophic methanogens) dominated in RW and DR soils. Redundancy analysis revealed that the community structure of methanogens was significantly affected by soil pH,indicating that the differences in methanogenic pathways under the three typical cropping modes might be caused by the changes in community composition driven by soil pH. The findings suggest that soil pH-induced methanogenic abundance and community composition drive paddy MPP and methanogenic pathways, which would provide important insights into the CH4 reduction in paddies.

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Effects of salinity on methane emissions and methanogenic archaeal communities in different habitat of saline-alkali wetlands

Li,

et al. 2023

Environ Sci Pollut Res

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The increase in temperature caused by global climate change has promoted the salinization of wetlands.Inland saline-alkaline wetlands have an environment of over-humidity and shallow water and are hot spots for CH 4 emissions. However, there are few reports on the effect of salinity on CH 4 emissions in inland saline-alkaline wetlands. This study revealed the effects of salinity, habitat, and their interactions on CH 4 emissions, and explored the response of methanogenic archaea to salinity. Overall, salinity inhibited CH 4 emissions. But there were different responses in the three habitat soils. Salinity decreased the relative abundance of methanogenic archaea and changed the community structure. In addition, salinity changed soil pH and dissolved organic carbon (DOC) and ammonium (NH 4 + ) concentrations, which were signi cantly correlated with methanogenic archaea. Our study showed that salinity changed the soil physicochemical properties and characteristics of the methanogenic archaeal community, affecting CH 4 emissions.

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Methane emission, methanogenic and methanotrophic communities during rice-growing seasons differ in diversified rice rotation systems

Cited by 19 publications

References 53 publications

Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Differences in methanogenic pathways and methanogenic communities in paddy soils under three typical cropping modes

Effects of salinity on methane emissions and methanogenic archaeal communities in different habitat of saline-alkali wetlands

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