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| Effects of DCD addition on CH4, N2O and CO2 emissions from paddy field under rice straw incorporation |
| Received:July 02, 2016 |
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| KeyWord:rice straw incorporation;dicyandiamide(DCD);global warming potential;greenhouse gas intensity;net ecosystem economic budget |
| Author Name | Affiliation | E-mail | | WANG Guo-qiang | College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Department of Agricultural Science and Technology, Tibet Vocational Technical College, Lhasa 850030, China | | | CHANG Yu-yan | College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | SONG Xing-xing | College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | ZHU Si-ming | College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | MAO Yan-ling | College of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | fafum@126.com |
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| Abstract: |
| Incorporation of crop residues in agricultural soils can maintain soil organic matter, but simultaneously stimulates greenhouse gas emission. The application of the nitrification inhibitor has been demonstrated to inhibit effectively greenhouse gas emission. However, it remains largely unknown in effects of the nitrification inhibitor application on soil CH4, N2O and CO2 emissions under straw return in farmland.In the present study, the emissions of farmland soil CH4, N2O and CO2 under rice straw return were investigated and estimated when the nitrification inhibitor(dicyandiamide, abbreviated DCD) was applied during the whole rice growing season through the pot experiment. The experiment included five treatments:conventional fertilization(CF), conventional fertilization plus DCD(CF+DCD), conventional fertilization plus straw return(CF+S), conventional fertilization plus straw return and DCD(CF+S+DCD), and no input of fertilizers as control(CK). The results showed that CH4 and CO2 emissions during the whole rice growing season were highest in the CF+S treatment, followed by CF+S+DCD treatment, and lowest in CK treatment. In contrast, N2O during the whole rice growing season were highest in the CF treatment, followed by CF+DCD treatment, and lowest in CF+S+DCD treatment. Compared with CF and CF+S treatments, the application of nitrification inhibitor significantly reduced CH4 and N2O emissions. In general, both straw return and nitrification inhibitor application significantly increased rice yield and net ecosystem economic budget(NEEB) but decreased global warming potential(GWP) and greenhouse gas intensity(GHGI). Compared with CF and CF+S treatments, the application of nitrification inhibitor increased crop yield by 9.5% and 10.0%, and NEEB by 16.8% and 20.1%, but decreased GWP by 23.7% and 21.0%, and GHGI by 23.7% and 21.1%. Thus, the application of nitrification inhibitor can significantly decrease greenhouse gas and sustain crop yield irrespective of straw return. Our results suggest that the combined of straw return and DCD application can be an effective greenhouse gas mitigation strategy without sacrifice crop yield. |
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