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Low O-2 level enhances CH4-derived carbon flow into microbial communities in landfill cover soils

文献类型： 外文期刊

作者： He, Ruo 1 ; Su, Yao 2 ; Leewis, Mary-Cathrine 4 ; Chu, Yi-Xuan 2 ; Wang, Jing 2 ; Ma, Ruo-Chan 2 ; Wu, Donglei 2 ; Zhan, 1 ;

作者机构： 1.Zhejiang Gongshang Univ, Sch Environm Sci & Engn, Zhejiang Prov Key Lab Solid Waste Treatment & Rec, Hangzhou 310012, Peoples R China

2.Zhejiang Univ, Dept Environm Engn, Hangzhou 310058, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Peoples R China

4.Univ Alaska Fairbanks, Inst Arctic Biol, Fairbanks, AK 99775 USA

5.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA

6.Zhejiang Univ, MOE Key Lab Soft Soils & Geoenvironm Engn, Hangzhou 310058, Peoples R China

关键词： Oxygen concentration; Landfill cover soils; Methane oxidation; Methanorrophs; Methane-derived carbon; Stable isotope probing

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 258 卷

页码：

收录情况： SCI

摘要： CH4 oxidation in landfill cover soils plays a significant role in mitigating CH4 release to the atmosphere. Oxygen availability and the presence of co-contaminants are potentially important factors affecting CH4 oxidation rate and the fate of CH4-derived carbon. In this study, microbial populations that oxidize CH4 and the subsequent conversion of CH4-derived carbon into CO2, soil organic C and biomass C were investigated in landfill cover soils at two O-2 tensions, i.e., O-2 concentrations of 21% ("sufficient") and 2.5% ("limited") with and without toluene. CH4-derived carbon was primarily converted into CO2 and soil organic C in the landfill cover soils, accounting for more than 80% of CH4 oxidized. Under the O-2-sufficient condition, 52.9%-59.6% of CH4-derived carbon was converted into CO2 (CECO2-C), and 29.1%-39.3% was converted into soil organic C (CEorganic-C). A higher CEorganic-C and lower CECO2-C occurred in the O-2-limited environment, relative to the O-2-sufficient condition. With the addition of toluene, the carbon conversion efficiency of CH4 into biomass C and organic C increased slightly, especially in the O-2-limited environment. A more complex microbial network was involved in CH4 assimilation in the O-2-limited environment than under the O-2-sufficient condition. DNA-based stable isotope probing of the community with (CH4)-C-13 revealed that Methylocaldum and Methylosarcina had a higher relative growth rate than other type I methanotrophs in the landfill cover soils, especially at the low O-2 concentration, while Methylosinus was more abundant in the treatment with both the high O-2 concentration and toluene. These results indicated that O-2-limited environments could prompt more CH4-derived carbon to be deposited into soils in the form of biomass C and organic C, thereby enhancing the contribution of CH4-derived carbon to soil community biomass and functionality of landfill cover soils (i.e. reduction of CO2 emission). (C) 2019 Elsevier Ltd. All rights reserved.

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