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| Evaluation of greenhouse gas emissions and economic benefits of different measures of rice-wheat rotation under warming |
| Received:December 11, 2024 |
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| KeyWord:rice-wheat rotation;greenhouse gas;warming;economic efficiency |
| Author Name | Affiliation | E-mail | | TANG Yujie | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology, Nanjing 210044, China | | | WU Yue | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology, Nanjing 210044, China | | | QIAO Yunfa | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology, Nanjing 210044, China | | | MA Yinzheng | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology, Nanjing 210044, China | | | MIAO Shujie | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Jiangsu Provincial University Key Laboratory of Agricultural and Ecological Meteorology, Nanjing 210044, China | Sjmiao2015@nuist.edu.cn |
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| Abstract: |
| To assessed the combined effects of different management practices on greenhouse gas emissions and economic benefits in a rice-wheat rotation system under a warming scenario. In this study, from November 2022 to October 2023, we set up ambient and increased temperature treatments in an open warming system, and combined six management practices, including control（CK）, change of planting density（PD）, change of varieties（CV）, application of biochar（BC）, delayed sowing date（SD）, and increase of nitrogen fertilizer（NF）, and CH4 and N2O emissions were monitored by static chamber gas chromatography, and the comprehensive benefits of the system were analyzed in terms of the annual yields, greenhouse gas emissions, and economic inputs. Results showed that both annual CH4 and N2O emissions from the rice-wheat rotation system were significantly affected by temperature increase and management practices. Under ambient condition, CH4 emissions reduced by 27.23%, 21.12%, 17.30%, and 11.96% in PD, CV, BC and SD treatments, respectively, compared to CK treatment, and PD treatment also reduced N2O emissions（19.38%, P<0.05）. Under warming condition, CH4 emissions reduced by 21.78%, 21.49%, and 10.03% in the PD, BC, and NF treatments, respectively, compared to the CK treatment, and N2O emissions reduced in all treatments. In addition, BC and NF treatments showed stronger adaptability to temperature increase, and the global warming potential significantly reduced by 18.56% and 20.84%（P<0.05）in BC and NF treatments under warming condition compared with ambient condition, respectively. In terms of yields and economic benefits, both PD and SD treatments reduced yields and economic benefits under both temperature conditions, whereas CV, NF and BC treatments showed significant increases in annual yields and net margins compared to CK treatments, and NF treatments showed stronger adaptation to temperature increase, and the net margins of NF treatments under temperature increase conditions were significantly（8.82%, P<0.05）higher compared to ambient conditions. The study showed that under warming conditions, the application of biochar and nitrogen fertilizer can effectively reduce greenhouse gas emissions and improve crop yields and economic benefits in the rice-wheat rotation system by accelerating the decomposition of biochar for crop uptake and utilization and improving crop nitrogen utilization efficiency by warming, respectively, to achieve sustainable agricultural development. |
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