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| The relationship between N2O emission flux from paddy fields and nitrifying-denitrifying bacteria under different irrigation methods and nitrogen treatments |
| Received:May 25, 2017 |
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| KeyWord:irrigation methods;combined application of organic and inorganic N fertilizers;N2O;emission flux |
| Author Name | Affiliation | E-mail | | PEI Zi-wei | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Academician Work Station of the New Technology of Water-saving Agriculture in Karst Region, Nanning 530004, China
Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Nanning 530005, China | | | CHEN Yi-chao | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Academician Work Station of the New Technology of Water-saving Agriculture in Karst Region, Nanning 530004, China
Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Nanning 530005, China | | | LI Fu-sheng | College of Agriculture, Guangxi University, Nanning 530004, China
Guangxi Academician Work Station of the New Technology of Water-saving Agriculture in Karst Region, Nanning 530004, China
Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Nanning 530005, China | zhenz@gxu.edu.cn,lpfu6@163.com | | HUANG Zhong-hua | Nanning Irrigation Experimental Station, Nanning 530001, China | | | LUO Wei-gang | Nanning Irrigation Experimental Station, Nanning 530001, China | |
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| Abstract: |
| To develop a suitable irrigation method and nitrogen (N) management approach for reducing N2O emissions from paddy fields, the effect of different irrigation methods and N treatments on the N2O emission flux from paddy fields over an entire growth period was investigated. To achieve this, the inorganic N content and number of nitrifying-denitrifying bacteria in the soil at different growth stages were determined using field experiments. The relationship between the N2O emission flux from paddy fields and the inorganic N content as well as the number of nitrifying and denitrifying bacteria was analyzed for each sampling day. The field experiment included three irrigation methods, namely, conventional irrigation (CI), "thin-shallow-wet-dry" irrigation (TI), and alternate drying and wetting irrigation (DI). Two N treatments, namely, 100% urea (RN1) and 50% urea + 50% pig manure (RN2) were also used at the same N application rate. For the same N application, the TI method was found to reduce the N2O emission flux from paddy fields. The DI and TI methods were found to have a higher number of nitrate and nitrite bacteria as well as inorganic N content than the CI method. The CI and TI methods were found to increase the number of denitrifying bacteria compared to the DI method. Under the same irrigation method, the RN1 treatment was found to decrease the N2O emission flux significantly, and the RN1 treatment decreased the number of nitrate, nitrite, and denitrifying bacteria, as well as the inorganic N content compared to the RN2 treatment. There were significant positive correlations between the N2O emission flux from paddy fields and the NH4+-N content, as well as the number of nitrate bacteria and denitrifying bacteria in the soil. Significant positive correlations were also observed between the NH4+-N content and the number of nitrate bacteria and denitrifying bacteria in the soil. Therefore, it is shown that the "thin-shallow-wet-dry" irrigation method and urea treatment can reduce the N2O emission flux from paddy fields, and the N2O emission flux was affected by the NH4+-N content and number of nitrate bacteria and denitrifying bacteria in the soil. |
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