The influence of soil temperature, methanogens and methanotrophs on methane emissions from cold waterlogged paddy fields
| Autor: | Yousheng Xiong, Minmin Zhang, Xiangyu Xu, Ronggui Hu, Muhammad Shaaban, Wei Zhou, Jiafu Yuan |
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| Rok vydání: | 2020 |
| Předmět: |
China
Environmental Engineering Methanotroph 0208 environmental biotechnology 02 engineering and technology Euryarchaeota 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Soil Cropping system Waste Management and Disposal Water content 0105 earth and related environmental sciences biology Atmospheric methane Soil organic matter Temperature Sowing Oryza General Medicine biology.organism_classification Methanogen 020801 environmental engineering Agronomy Environmental science Methane Waterlogging (agriculture) |
| Zdroj: | Journal of Environmental Management. 264:110421 |
| ISSN: | 0301-4797 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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