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| Effects of different straw utilization methods on methane emissions from straw returning to paddy field in a rice-wheat rotation system |
| Received:August 28, 2020 |
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| KeyWord:biochar;straw-decomposing microbial inoculants;methane;yield-scaled methane emission;paddy field |
| Author Name | Affiliation | E-mail | | ZHANG Xi-dong | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | YAN Ling | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHOU Wei | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China | | | WU Qiu-ling | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | YANG Bo | AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | MA Yu-chun | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | mayc@nuist.edu.cn |
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| Abstract: |
| Straw returning to paddy field can promote soil carbon sequestration. There is great uncertainty about the effects of different straw utilization methods on methane(CH4) emissions in rice-wheat rotation systems. Therefore, in situ static chamber-gas chromatography was used to observe the effects of different straw utilization methods on CH4 emissions in a rice-wheat rotation system in the Taihu Lake region. Four treatments were set up in the experiment, including NPK(no straw plus fertilizer), NPK+S(wheat straw plus fertilizer), NPK+ B(straw-derived biochar plus fertilizer), and NPK+SDI(wheat straw with straw-decomposing microbial inoculants plus fertilizer). The CH4 emissions under different treatments were mainly concentrated in the rice growing season. Compared with those of the NPK treatment, the NPK+S and NPK+SDI treatments increased the CH4 emissions by 12.7% and 20.9%, respectively. Conversely, the NPK+B treatment decreased the CH4 emissions by 7.5% compared with those of NPK. Compared with those of the NPK+S treatment, the CH4 emissions in the NPK + SDI treatment significantly increased by 7.3%, whereas they decreased significantly by 17.9% in the NPK + B treatment. Biochar amendment(NPK+B) increased the grain yield, but other treatments did not. Compared with those of the NPK treatment, the NPK+S and NPK+SDI treatments significantly increased the yield-scaled methane emissions by 23.7% and 18.4%, respectively. In contrast, the NPK+ B treatment reduced the yield-scaled methane emissions by 19.9%. However, compared with those of the NPK+S treatment, both the NPK+ SDI and NPK + B treatments reduced the yield-scaled methane emissions by 4.3% and 35.3%, respectively. This study shows that coapplication of straw-decomposing microbial inoculants or application of straw-derived biochar are advantageous for reducing the environmental damage caused by straw returning to the field. In addition, the straw-derived biochar is better. |
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