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| Effects of optimized N fertilization on carbon dioxide, methane and nitrous oxide fluxes in paddy fields in Yellow River water irrigation region of Ningxia |
| Received:November 30, 2015 |
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| KeyWord:Yellow River water irrigation region of Ningxia;optimized N fertilization;soil;greenhouse gas;global warming potential |
| Author Name | Affiliation | E-mail | | WANG Yong-sheng | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China | | | ZHANG Ai-ping | Institute of Agro-Environment and Sustainable Development, CAAS/Key Laboratory of Agro-Environment and Climate Change, China Ministry of Agriculture, Beijing 100081, China | apzhang0601@126.com | | LIU Ru-liang | Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750000, China | | | YANG Shi-qi | Institute of Agro-Environment and Sustainable Development, CAAS/Key Laboratory of Agro-Environment and Climate Change, China Ministry of Agriculture, Beijing 100081, China | | | LI Cun-jun | Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China | |
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| Abstract: |
| Excessive nitrogen(N) fertilizer application is a widespread practice in Yellow River water irrigation region of Ningxia. Previous studies have demonstrated that optimized N fertilization can not only improve rice yield but also reduce nitrogen leaching. However, there was little information available about the responses of soil greenhouse gas fluxes to optimized N fertilization in this region. A field experiment was conducted to evaluate the effects of different N fertilization on carbon dioxide(CO2), methane(CH4) and nitrous oxide(N2O) fluxes and global warming potential(GWP) in paddy field in Yellow River water irrigation region of Ningxia, using static chamber technique and gas chromatography. Treatments included conventional N fertilization(N300), optimized N fertilization(N240) and no N fertilization(N0). Our results showed obvious differences in greenhouse gas fluxes during the rice growth period. Higher CO2 emissions appeared at filling and mature stages, but CH4 emissions mainly occurred at booting stage. However, the peak of N2O emissions was observed at tillering and elongation stages. Applying nitrogen significantly increased soil CO2, CH4, and N2O emissions and the global warming potential. During the experimental period, average CO2, CH4, and N2O fluxes were 18 446.87 kg C·hm-2, 146.57 kg C·hm-2, and 2.93 kg N·hm-2, respectively. One-season optimized N fertilization did not affect CO2 emissions, but significantly reduced CH4 and N2O emissions by 24.42% and 36.28%, respectively, as compared with conventional N fertilization. Overall, our results indicate that the global warming potential of paddy field was significantly reduced by 26.70% by optimized N fertilization in Yellow River water irrigation region of Ningxia. Further research is needed to analyze the mechanisms of soil greenhouse gas fluxes under long-term optimized N fertilization by integrating the variations of soil organic carbon and N availability and soil microbiology methods. |
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