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| Effects of nitrogen fertilization and water content on the process and rate of N2O emission in paddy soils |
| Received:May 31, 2017 |
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| KeyWord:N2O;paddy soils;autotrophic nitrification;heterotrophic nitrification;abiotic nitrification |
| Author Name | Affiliation | E-mail | | XI Rui-ze | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | FU Qing-ling | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | fuqingling@mail.hzau.edu.cn | | YANG Yong-qiang | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | YOU Jin-wei | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHU Jun | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Hong-qing | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | YE Lei | Tuanlin Irrigation Experimental Station, Zhanghe Water Engineering Authority, Jingmen 448800, China | |
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| Abstract: |
| Paddy soil is an important source of N2O emission, and nitrogen availability and soil moisture are the key factors affecting the emission of N2O. The influence of nitrogen form (urea and ammonium sulfate) and water content on the attribution of autotrophic, heterotrophic, and abiotic nitrification to N2O emission from the paddy soil was investigated under simulated conditions by using the acetylene inhibition method to measure the N2O emission rate at different stages. The results showed that the nitrogen fertilizer significantly increased the rate of N2O emission by autotrophic and heterotrophic nitrification processes and the total process. The N2O emission of the soil treated with urea was higher than that of the soil treated with ammonium sulfate. With the soil moisture content ranging from 48% to 160%, the total N2O emissions and the amount of N2O emitted by autotrophic and heterotrophic nitrification processes increased significantly. The production of N2O is mainly dominated by the biological processes. The highest contribution of the biological nitrification process (including autotrophic and heterotrophic nitrification) reached 51.1%, but the contribution of abiotic nitrification was relatively less. These results provide a scientific base for improving the nitrogen-use efficiency of rice plants and for reducing the agricultural greenhouse-gas emission in paddy soils. |
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