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| Screening of methane abatement materials and reduction mechanisms in green manure paddy soils |
| Received:June 07, 2024 |
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| KeyWord:green manure;methane;emission reduction material;methanogenic archaea;2-chloroethanesulfonate |
| Author Name | Affiliation | E-mail | | SUN Jinxin | State Key Laboratory of Efficient Utilization of Arable Land in China, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | | | ZHOU Guopeng | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization
Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | zhouguopeng@ahau.edu.cn | | MA Zhengbo | State Key Laboratory of Efficient Utilization of Arable Land in China, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LIANG Ting | State Key Laboratory of Efficient Utilization of Arable Land in China, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | | | CHANG Danna | State Key Laboratory of Efficient Utilization of Arable Land in China, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LIU Jia | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China | | | LIU Han | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China | | | CAO Weidong | State Key Laboratory of Efficient Utilization of Arable Land in China, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | caoweidong@caas.cn |
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| Abstract: |
| Green manure plays an important role in cultivating healthy soil and ensuring high yield and quality of rice. However, it may trigger the increase of CH4 emission from green manure paddy soil for the return of high amount of organic matter to the field, and corresponding control pathways need to be developed. In this study, we investigated the CH4 emission reduction effects of five CH4 abatement materials, including sesbania biochar, calcium peroxide, sulfur, 2-chloroethanesulfonate, and goethite, after green manure returned to the paddy soils through simulation experiments, and carried out the mechanism studies for the materials with better abatement effects. The results showed that green manure returned to paddy field increased CH4 emission compared with no green manure（CK）, and CH4 emission was reduced by the addition of abatement materials. Among them, the cumulative CH4 emission reduction was smaller with the addition of the sesbania biochar（GM+C）and sulfur（GM+S）compared to green manure alone（GM）19.5% and 23.8%, respectively. And 2-chloroethanesulfonate（GM+CES）showed the best CH4 emission reduction compared to GM, with 66.7% reduction in cumulative CH4 emission and 52.5% reduction in global warming potential（GWP）. At the end of the incubation（90 d）, compared to GM, the addition of 2-chloroethanesulfonate decreased soil pH by 0.4 units and methanogenic archaea by 29.9%. Random forest modeling and correlation analyses revealed that the abundance of the mcrA gene of methanogenic archaea was significantly and positively correlated with CH4 emission, and this result suggests that methanogenic archaea is an important factor in driving CH4 emission from paddy soil. In summary, CH4 emission can be reduced through the addition of emission-reduction materials to green manure paddy field soils. Among these, 2- chloroethanesulfonate demonstrates the best performance in this study, specifically and efficiently inhibiting the methanogenic archaeal community, making it a promising material for future exploration in reducing CH4 emissions. |
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