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| Dynamic characteristics and mechanisms of CaO2 regulation on CH4 emissions from paddy fields under cultivation |
| Received:December 12, 2024 |
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| KeyWord:submerged rice soil;calcium peroxide;methanogens;methanotrophs;CH4 emission |
| Author Name | Affiliation | E-mail | | WANG Jianing | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | XU Xiangyu | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | xuxy@hbaas.ac.cn | | LI Mengtao | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
College of Life Sciences, Hubei University, Wuhan 430062, China | | | YUE Lulu | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LI Jiaying | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | | | ZHAO Shujun | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | | | TONG Lisha | Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China | | | ZHAO Zhuqing | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | |
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| Abstract: |
| Long-term waterlogging in gleization paddy fields creates anaerobic soil conditions that promote substantial accumulation of reductive substances, which not only impedes rice growth but also exacerbates methane（CH4）emissions. To address this issue, calcium peroxide（CaO2）granules（2-3 mm diameter）prepared through disc granulation were applied to investigate their impacts on CH4 emissions and underlying mechanisms under continuous flooding. A pot experiment with four treatments was conducted: control（CK）, and three CaO2 application rates（LC: 0.15 g · kg-1, MC: 0.30 g · kg-1, HC: 0.60 g · kg-1, fresh soil basis）. Systematic analyses were performed on soil physicochemical properties, reductive substances, microbial functional gene abundance, and CH4 emissions. Key findings revealed that: all CaO2 treatments initially suppressed CH4 emissions within 43 days after transplanting, but ultimately enhanced emissions by maturity. The MC treatment showed 88.2% higher cumulative emissions than CK, though 29.2% and 10.4% lower than LC and HC treatments respectively. LC treatment demonstrated superior reduction efficiency for total reductive substances（0.1%）, active reductive substances （0.6%）, Fe2+（3.0%）, and Mn2+（8.2%）compared to CK. Methanogen（mcrA）gene abundance increased across all treatments（LC > HC > MC）, while methanotroph（pmoA）abundance decreased in LC, MC but increased in HC. CaO2 amendments elevated soil pH and dissolved organic carbon（DOC）, while reducing NH4+-N and NO3--N contents. These findings indicate that CaO2 application can temporarily mitigate CH4 emissions within 43 days, but exhibits complex long-term dynamics. |
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