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| Effect of different irrigation methods on rice yield and greenhouse gas emissions under crop residue incorporation in double rice-cropping systems |
| Received:June 22, 2017 |
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| KeyWord:double rice-cropping systems;straw return;irrigation methods;greenhouse gases;grain yield |
| Author Name | Affiliation | E-mail | | CHENG Chen | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | YANG Xiu-xia | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | WANG Jian-jun | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | CHENG Hui-huang | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | LUO Kang | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | ZENG Yong-jun | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | SHI Qing-hua | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | | | SHANG Qing-yin | Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China | sqyt@163.com |
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| Abstract: |
| As the main by-product of crop production, crop straw contains abundant organic matter, nitrogen, phosphorus, potassium, and other nutrients. As a popular management practice in double rice-cropping systems of China, straw incorporation can increase crop yield by improving soil physical and chemical properties and promoting soil quality and nutrient cycling. However, straw incorporation would increase greenhouse gas emissions from rice paddies; therefore, a feasible management practice should be sought to mitigate the global warming potential from CH4 and N2O emissions. Appropriate water management is an effective way to reduce greenhouse gas emissions, but the effect of different irrigation methods on rice yield and greenhouse gas emissions under crop residue incorporation is still unclear. A field experiment was conducted in 2013-2015 to determine the effect of water regimes on rice yield and greenhouse effect under crop residue incorporation in typical double rice-cropping systems. The three irrigation methods included continuous flooding(F), flooding-midseason drainage-reflooding(F-D-F), and flooding-midseason drainage-reflooding-moist intermittent irrigation(F-D-F-M) in the rice growing seasons. Rice straw was simultaneously chopped into 5 cm pieces by using a combine harvester. The results showed that, compared with that of the F plots, the grain yield in the F-D-F and F-D-F-M plots was increased by 9.8% and 2.7% in the early-rice season and by 4.8% and 2.0% in the late-rice season, respectively. The grain yield in the F-D-F plots was significantly higher than that in the F-D-F-M plots in the early-rice season. Compared with that of the F plots, the average spikelet number per panicle in the F-D-F and F-D-F-M plots was increased by 12.5% and 5.7% in the early-rice season and by 9.7% and 3.1% in the late-rice season, respectively. Across the three-year rotation cycle in the double rice-cropping system, the annual range of CH4 emission in the F, F-D-F, and F-D-F-M plots was 678.2~988.4, 322.6~661.7 kg·hm-2·a-1, and 208.3~520.6 kg·hm-2·a-1, and that of N2O emissions of the F, F-D-F, and F-D-F-M plots was 5.86~12.64, 4.25~11.24 kg N·hm-2·a-1, and 9.14~14.91 kg N·hm-2·a-1, respectively. Compared with that of the F plots, the global warming potential in the F-D-F and F-D-F-M plots was remarkably reduced by 31.5%~44.9% and 38.2%~53.4%, respectively. The greenhouse gas emission intensity in the F-D-F and F-D-F-M plots was remarkably reduced by 36.2%~48.7% and 38.8%~54.6%, respectively. Therefore, compared with continuous waterlogging, both of midseason drainage and intermittent irrigation can increase rice yield and mitigate greenhouse gas emissions under crop residue incorporation in the double rice-cropping system. |
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