No-tillage enhances soil organic carbon and methane-oxidizing bacteria to mitigate methane emissions in an oilseed rape-rice system
文献类型： 外文期刊
作者： Ma, Mingkun 1 ; Yang, Zepeng 1 ; Chen, Shanghong 1 ; Liu, Dinghui 1 ; Zheng, Shenghua 1 ; Chen, Honglin 1 ;
作者机构： 1.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Agr Environm Southwest Mt Areas, Chengdu 610066, Peoples R China
关键词： No-tillage; Oilseed rape-rice rotation system; Greenhouse gases; Carbon fixation; Methane-oxidizing bacteria
期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）
ISSN： 0032-079X
年卷期： 2025 年
页码：
收录情况： SCI
摘要： Background and aimsDifferences in farming practices play a crucial role in shaping farmland sustainability, soil quality, and global warming potential (GWP). While no-tillage (NT) practices have been extensively studied in widely adopted cropping systems such as wheat-corn and rice monoculture, the effects of no-tillage on oilseed rape-rice rotation systems remain underexplored. In particular, the microbial-driven mechanisms involved remain poorly understood.MethodsThe study was conducted over a 2-year cycle of an oilseed rape-rice rotation system. Soil greenhouse gas emissions and carbon sequestration under NT and CT management practices were measured and compared. Additionally, high-throughput sequencing of soil methanogens and methane-oxidizing bacteria was performed.ResultsCompared with CT, NT significantly reduced CH4 and CO2 emissions by 20.3% and 16.6%, respectively. Although N2O emissions increased by 24.0%, the overall GWP decreased by 9.9%. NT also increased the carbon efficiency ratio (CER, the ratio of grain yield (carbon content) to carbon equivalent emissions) by 26.6% and increased soil organic carbon by 8.6% over the 2-year period. High-throughput sequencing revealed that NT significantly enhanced the diversity and abundance of methane-oxidizing microorganisms (methanotrophs, which mitigate methane by converting it to CO2 under aerobic conditions) and altered the relative abundance of dominant genera compared to CT.ConclusionNT is an effective strategy to reduce CH4 emissions, enhance soil and crop carbon fixation, and increase the diversity of soil methane-oxidizing bacteria in oilseed rape-rice rotation. This practice offers substantial environmental benefits, contributing to sustainable farmland development and mitigating global warming potential.
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