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Spatial patterns of methane oxidation and methanotrophic diversity in landfill cover soils of southern China. | LitMetric

AI Article Synopsis

  • Aerobic methane (CH4) oxidation plays a crucial role in reducing CH4 emissions in landfills, particularly in the Mengzi semi-aerobic landfill in China, where research was conducted on methanotroph diversity related to soil conditions.
  • Different locations within the landfill showed distinct methanotroph communities, especially near venting pipes where oxygen (O2) levels were higher, promoting methanotroph abundance.
  • Type II methanotrophs were more prevalent than Type I across all samples, with Methylocystis and Methylobacter being the dominant genera, indicating that the landfill environment supports significant methanotroph activity due to elevated CH4 and O2 concentrations.

Article Abstract

Aerobic CH4 oxidation is an important CH4 sink in landfills. To investigate the distribution and community diversity of methanotrophs and link with soil characteristics and operational parameters (e.g., concentrations of O2, CH4), cover soil samples were collected at different locations and depths from the Mengzi semi-aerobic landfill (SAL) in Yunnan Province of southern China. Specific PCR followed by denaturing gradient gel electrophoresis and realtime PCR were used to examine methanotrophs in the landfill cover soils. The results showed that different locations did harbor distinct methanotroph communities. Methanotrophs were more abundant in areas near the venting pipes because of the higher O2 concentrations. The depth of 20-25 cm, where the ratio of the CH4 to O2 was within the range from 1.3 to 8.6, was more conducive to the growth of CH4-oxidizing bacteria. Type II methanotrophs dominated in all samples compared with Type I methanotrophs, as evidenced by the high ratio of Type II to Type I methanotrophic copy numbers (from 1.76 to 11.60). The total copy numbers of methanotrophs detected were similar to other ecosystems, although the CH4 concentration was much higher in SAL cover soil. Methylobacter and Methylocystis were the most abundant Type I and Type II methanotrophs genera, respectively, in the Mengzi SAL. The results suggested that SALs could provide a special environment with both high concentrations of CH4 and O2 for methanotrophs, especially around the vertical venting pipes.

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Source
http://dx.doi.org/10.4014/jmb.1408.08055DOI Listing

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