Effect of elevated atmospheric CO2 concentration on the activity, abundance and community composition of aerobic methanotrophs in paddy soils

Liu, Xin; Shen, Li‐dong; Yang, Wang-ting; Tian, Mao-hui; Jin, Jing-hao; Yang, Yumei; Liu, Jiaqi; Hu, Zhenghua; Wu, Hong‐sheng

doi:10.1016/j.apsoil.2021.104301

Cited by 18 publications

(5 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And the measured CH4 concentration is much higher than the average concentration in the atmosphere. This phenomenon is caused by CH4 production and its release from soil microorganisms, such as methanotrophs, and chemical reactions of fertilizers [21]. In contrast, the measured CO2 concentration data mainly complied with the data for photosynthesis and artificial ventilation, implying a desired detection performance [22].…”

Section: A Field Application In Lab and Greenhousementioning

confidence: 99%

Near-Infrared Off-Axis Integrated Cavity Output Spectroscopic Dual Greenhouse Gas Sensor Based on FPGA for in situ Application

Wang

Chuai

et al. 2022

IEEE Access

View full text Add to dashboard Cite

In this study, we investigated the trade-off between the applicable field performance and the high sensitivity of infrared absorption sensors and provided an optimization scheme. A near-infrared greenhouse gas sensor was developed based on off-axis integrated cavity output spectroscopy (OA-ICOS) for optimal detection performance with a highly integrated design. The developed sensor included a 12 cm compact cavity length with an effective absorption path length of ~68.2 m, simultaneously focused on carbon dioxide (CO2) and methane (CH4) detection. Different from in-lab studies, the whole driving and signal processing functions were realized by a single FPGA processer. Using a calibration experiment with limited hardware resources, the developed optimized locked-in amplifier and denoising scheme improved the precision levels by ~3.2 times compared to a traditional design. An Allan deviation analysis showed that the minimum detection limits were optimized to 0.9 ppmv (CH4) and 21 ppmv (CO2). A field application was carried out in the town of SheLin over the course of 1 day, and the measurement results conformed to the gas diffusion, biological photosynthesis and respiration characteristics, which indicated the potential of the sensor for in situ applications. This work reveals the relationship between limited hardware resources and detection performance and provides an optimization scheme to exploit compact OA-ICOS sensors with improved sensitivity.INDEX TERMS off-axis integrated cavity output spectroscopy; Gas sensor; near-infrared; dew condensation; greenhouse gases

show abstract

Section: A Field Application In Lab and Greenhousementioning

confidence: 99%

Near-Infrared Off-Axis Integrated Cavity Output Spectroscopic Dual Greenhouse Gas Sensor Based on FPGA for in situ Application

Wang

Chuai

et al. 2022

IEEE Access

View full text Add to dashboard Cite

show abstract

“…As the second-most powerful greenhouse gas after carbon dioxide (CO 2 ), methane (CH 4 ) has received great global concern to address climate change (Liu et al, 2022). Rice fields are important anthropogenic sources of worldwide CH 4 emissions and are estimated at 24-39 Tg yr -1 , accounting for 12-21% of the global agriculture emission per year (Saunois et al, 2020).…”

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.

show abstract

“…Atmospheric methane (CH 4 ) is the second most abundant greenhouse gas, following carbon dioxide (CO 2 ). Consequently, considerable global attention has been focused on efforts to reduce CH 4 emissions to mitigate climate change (X. Liu et al., 2022). Rice fields are significant anthropogenic sources of global CH 4 emissions, contributing to approximately 24–39 Tg yr −1 , which accounts for 12%–21% of the annual global emissions from agriculture (Saunois et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Differences in Methanogenic Pathways and Communities in Paddy Soils Under Three Typical Cropping Modes

Shen,

Ji,

Huang

et al. 2023

JGR Biogeosciences

View full text Add to dashboard Cite

The methane (CH4) production process in paddy fields varies depending on different cropping modes. However, there is limited knowledge on the changes in anaerobically produced CH4 isotopic ratios (δ13CH4), the methanogenic pathways, and the dominant communities of methanogens in paddy soils under different modes. To address this, we conducted experiments using anaerobic incubation methods, stable carbon isotope fractionation through inhibition studies with fluoromethane, and high‐throughput sequencing. These methods allowed us to measure the CH4 production potential (MPP), the relative contribution of acetoclastic methanogenesis to CH4 production (fac), and the composition of the methanogen community in paddy soils under three typical cropping modes: Rice‐Wheat (RW), Rice‐Fallow (RF), and Double‐Rice (DR) in China. The results showed that MPP was 30.7 μg CH4 g−1 d−1 in DR soil, around 57% and 66% higher than that in RW and RF soils, respectively, possibly due to the lower pH, clay content, and higher abundance of the mcrA gene. Moreover, RF soil had the highest value of produced δ13CH4 (−43.9‰) but the lowest value of produced δ13CO2 (−26.3‰). Based on the carbon isotope fractionation associated with methanogenesis via H2/CO2 reduction (1.049–1.062), the values of fac estimated in the RF soil (80%–98%) were much higher than that in the RW (39%–60%) and DR soils (52%–75%). This could be supported by the finding showing that Methanosarcina, the acetoclastic methanogens, were dominant in RF soil, while Methanosarcina and Methanobacterium (the hydrogenotrophic methanogens) dominated in RW and DR soils. Redundancy analysis revealed that the community structure of methanogens was significantly affected by soil pH. The findings suggest that differences in the abundance and composition of methanogens, possibly driven by soil pH, play a key role in regulating methanogenesis in the paddy soils, and further provide valuable insights into the process of CH4 production in different cropping modes.

show abstract

Effect of elevated atmospheric CO2 concentration on the activity, abundance and community composition of aerobic methanotrophs in paddy soils

Cited by 18 publications

References 69 publications

Near-Infrared Off-Axis Integrated Cavity Output Spectroscopic Dual Greenhouse Gas Sensor Based on FPGA for in situ Application

Near-Infrared Off-Axis Integrated Cavity Output Spectroscopic Dual Greenhouse Gas Sensor Based on FPGA for in situ Application

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

Differences in Methanogenic Pathways and Communities in Paddy Soils Under Three Typical Cropping Modes

Contact Info

Product

Resources

About