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| Reduction of nitrogen fertilizers combined with N conversion control additives influences CO2 and CH4 emissions in winter wheat field |
| Received:October 27, 2018 |
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| KeyWord:winter wheat;N reduction;conversion control additives;CO2 emission;CH4 emission |
| Author Name | Affiliation | E-mail | | WANG Yan-qun | College of Resources and Environmental Science/Hebei Province Key Laboratory for Farmland Eco-Environment, Hebei Agricultural University, Baoding 071001, China | | | PENG Zheng-ping | College of Resources and Environmental Science/Hebei Province Key Laboratory for Farmland Eco-Environment, Hebei Agricultural University, Baoding 071001, China | pengzhengping@sina.com | | MA Yang | College of Resources and Environmental Science/Hebei Province Key Laboratory for Farmland Eco-Environment, Hebei Agricultural University, Baoding 071001, China | | | WU Min | College of Resources and Environmental Science/Hebei Province Key Laboratory for Farmland Eco-Environment, Hebei Agricultural University, Baoding 071001, China | | | WANG Yang | College of Resources and Environmental Science/Hebei Province Key Laboratory for Farmland Eco-Environment, Hebei Agricultural University, Baoding 071001, China | | | SONG Xue-li | Agriculture Bureau of Suning County, Cangzhou 062350, China | | | WANG Hui-xian | Agriculture Bureau of Rongcheng County, Rongcheng 071700, China | |
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| Abstract: |
| In order to address the problem of increasing CO2 and CH4 emissions and potential greenhouse gas warming(GWP)caused by excessive application of N fertilizer in wheat production, a field experiment was conducted to study the emissions of CO2, CH4 and GWP from wheat field soil under the conditions of reducing N, combined with N conversion control additives. Soil temperature, moisture and fertilization significantly affected greenhouse gas emissions. Compared with farmers' conventional nitrogen model, the average CO2 emission flux and total CO2 emission from the N reduction models decreased by 8.3%~32.6% and 7.8%~31.6%, but the average CH4 absorption flux and total absorption increases by 43.0%~130.8% and 49.4%~138.5%, respectively, with the total GWP and net GWP decreasing by 7.9%~31.6% and 14.5%~55.5%, respectively. Compared with the N reduction model, CO2 emission flux and total emission from models of the N reduction model, combined with N conversion control additives decreased by 5.9%~26.5% and 6.6%~25.8% respectively. Average absorption flux and total absorption of CH4 increased by 19.7%~61.3% and 20.2%~59.7% and total GWP and net GWP decreased by 6.6%~25.8% and 12.6%~47.9%, respectively. In summary, N reduction on the basis of farmers' N fertilizer rate and N fertilizer combined with N conversion control additives can significantly reduce soil CO2 emissions, promote CH4 uptake, and reduce GWP in the wheat season. Wheat fields are the source of CO2 emissions, and their emission flux has clear seasonal variations that are higher in summer, lower in spring and autumn, and lowest in winter. Under the experimental conditions, the soil shows weak absorption of CH4. |
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