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The influence of soil temperature, methanogens and methanotrophs on methane emissions from cold waterlogged paddy fields

文献类型： 外文期刊

作者： Xu, Xiangyu 1 ; Zhang, Minmin 2 ; Xiong, Yousheng 2 ; Yuan, Jiafu 2 ; Shaaban, Muhammad 5 ; Zhou, Wei 1 ; Hu, Ronggui 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China

2.Minist Agr PR China, Qianjiang Sci Observing & Expt Stn Agroenvironm &, Qianjiang 433100, Peoples R China

3.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Wuhan 430064, Peoples R China

4.Minist Griculture, Key Lab Fertilizat Agr Wastes, Wuhan 430064, Peoples R China

5.Bahauddin Zakariya Univ, Fac Agr Sci & Technol, Dept Soil Sci, Multan, Pakistan

关键词： Cold-waterlogged paddy field; Methane emissions; Global warming potential

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN： 0301-4797

年卷期： 2020 年 264 卷

页码：

收录情况： SCI

摘要： Paddy fields are major sources of atmospheric methane (CH4). However, CH4 emissions from cold-waterlogged paddy fields, a major type of paddy soil in China, remain unclear. Here we investigated the CH4 emissions and associated influential factors in cold-waterlogged paddy fields at two sites (Yangxin County and Daye City) in Hubei Province, South China. Normal paddy fields matched with parental material and cropping system were used as the controls. The CH4 emissions from cold-waterlogged fields were significantly higher than those from normal fields with (3.0-4.4-fold) or without (3.5-8.6-fold) rice. Rice planting increased CH4 emissions by 59-78% in cold-waterlogged fields and by 85-247% in normal fields. CH4 instantaneous fluxes were positively correlated with soil temperature and methanogen mcrA (methyl coenzyme M reductase alpha subunit) and methanotroph pmoA (methane monooxygenase) copy numbers at the annual scale. Under rice planting, mcrA copy number was higher in cold-waterlogged fields than in normal fields at both sites, whereas pmoA copy number had the same trend at the Daye site only. Soil temperature and water content influenced mcrA and pmoA copy numbers in the normal paddy fields, whereas soil organic matter content was more influential in the cold-waterlogged paddy fields. These findings suggest that perennial waterlogging is a prerequisite for substantial CH4 emissions from cold-waterlogged paddy fields, and it promotes the proliferation of methanogens and methanotrophs under rice planting. Therefore, CH4 production-oxidation processes are more active in cold-waterlogged paddy fields than in normal paddy fields.

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