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Aerobic and Anaerobic Nonmicrobial Methane Emissions from Plant Material

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† State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Xiangshan, Beijing 100093, China
‡ State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
§ Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
E-mail: [email protected] or [email protected]; phone: 0086-01-6283 6635; fax: 0086-01-6859 7569.
Cite this: Environ. Sci. Technol. 2011, 45, 22, 9531–9537
Publication Date (Web):September 30, 2011
https://doi.org/10.1021/es2020132
Copyright © 2011 American Chemical Society
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    Abstract

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    Methane (CH4) may be generated via microbial and nonmicrobial mechanisms. Nonmicrobial CH4 is also ubiquitous in nature, such as in biomass burning, the Earthʼs crust, plants, and animals. Relative to microbial CH4, nonmicrobial CH4 is less understood. Using fresh (living) and dried (dead) leaves and commercial structural compounds (dead) of plants, a series of laboratory experiments have been conducted to investigate CH4 emissions under aerobic and anaerobic conditions. CH4 emissions from fresh leaves incubated at ambient temperatures were nonmicrobial and enhanced by anaerobic conditions. CH4 emissions from dried leaves incubated at rising temperature ruled out a microbial-mediated formation pathway and were plant-species-dependent with three categories of response to oxygen levels: enhanced by aerobic conditions, similar under aerobic and anaerobic conditions, and enhanced by anaerobic conditions. CH4 emissions in plant structural compounds may help to fully understand nonmicrobial CH4 formation in plant leaves. Experiments of reactive oxygen species (ROS) generator and scavengers indicate that ROS had a significant role in nonmicrobial CH4 formation in plant material under aerobic and anaerobic conditions. However, the detailed mechanisms of the ROS were uncertain.

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