Non-microbial methane emissions from soils

doi:10.1016/j.atmosenv.2013.08.010

	Non-microbial methane emissions from soils
	Wang, Bin ; Hou, Longyu 1; Liu, Wei ; Wang, Zhiping
	2013
发表期刊	ATMOSPHERIC ENVIRONMENT
ISSN	1352-2310
卷号	80 页码:290-298
摘要	Traditionally, methane (CH4) is anaerobically formed by methanogenic archaea. However, non-microbial CH4 can also be produced from geologic processes, biomass burning, animals, plants, and recently identified soils. Recognition of non-microbial CH4 emissions from soils remains inadequate. To better understand this phenomenon, a series of laboratory incubations were conducted to examine effects of temperature, water, and hydrogen peroxide (H2O2) on CH4 emissions under both aerobic and anaerobic conditions using autoclaved (30 min, 121 degrees C) soils and aggregates (>2000 inn, A1; 2000-250 mu m, A2; 250-53 mu m, M1; and <53 mu m, M2). Results show that applying autoclaving to pre-treat soils is effective to inhibit methanogenic activity, ensuring the CH4 emitted being non-microbial. Responses of non-microbial CH4 emissions to temperature, water, and H2O2 were almost identical between aerobic and anaerobic conditions. Increasing temperature, water of proper amount, and H2O2 could significantly enhance CH4 emissions. However, the emission rates were inhibited and enhanced by anaerobic conditions without and with the existence of H2O2, respectively. As regards the aggregates, aggregate-based emission presented an order of M1 > A2 > A1 > M2 and C-based emission an order of M2 > M1 > A1 > A2, demonstrating that both organic carbon quantity and property are responsible for CH4 emissions from soils at the scale of aggregate. Whole soil-based order of A2 > A1 > M1 > M2 suggests that non-microbial CH4 release from forest soils is majorly contributed by macro-aggregates (i.e., >250 mu m). The underlying mechanism is that organic matter through thermal treatment, photolysis, or reactions with free radicals produce CH4, which, in essence, is identical with mechanisms of other non-microbial sources, indicating that non-microbial CH4 production may be a widespread phenomenon in nature. This work further elucidates the importance of non-microbial CH4 formation which should be distinguished from the well-known microbial CH4 formation in order to define both roles in the atmospheric CH4 global budget. (C) 2013 Elsevier Ltd. All rights reserved.
关键词	Non-microbial methane Autoclaving Aerobic Anaerobic Soil organic matter Soil aggregate
学科领域	Environmental Sciences ; Meteorology & Atmospheric Sciences
DOI	10.1016/j.atmosenv.2013.08.010
收录类别	SCI
语种	英语
WOS关键词	NATIVE GRASSLAND SOILS ; ORGANIC-MATTER ; ULTRAVIOLET-RADIATION ; CARBON STORAGE ; BIOCIDAL TREATMENTS ; TERRESTRIAL PLANTS ; OXIDATIVE STRESS ; METABOLISM ; FRACTIONATION ; FUMIGATION
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000328094800031
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1873-2844
资助机构	National Natural Science Foundation of China(National Natural Science Foundation of China (NSFC)) ; State Key Laboratory of Vegetation and Environmental Change
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/28050
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.China Agr Univ, Dept Grassland Sci, Beijing 100193, Peoples R China
推荐引用方式 GB/T 7714	Wang, Bin,Hou, Longyu,Liu, Wei,et al. Non-microbial methane emissions from soils[J]. ATMOSPHERIC ENVIRONMENT,2013,80:290-298.
APA	Wang, Bin,Hou, Longyu,Liu, Wei,&Wang, Zhiping.(2013).Non-microbial methane emissions from soils.ATMOSPHERIC ENVIRONMENT,80,290-298.
MLA	Wang, Bin,et al."Non-microbial methane emissions from soils".ATMOSPHERIC ENVIRONMENT 80(2013):290-298.

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