| 温度和氨氮浓度对水体N2O释放的影响 |
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| 引用本文： | 路俊玲,陈慧萍,肖琳.温度和氨氮浓度对水体N2O释放的影响[J].中国环境科学,2019,39(1):330-335. |
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| 作者姓名： | 路俊玲 陈慧萍 肖琳 |
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| 作者单位： | 南京大学环境学院, 污染控制与资源化国家重点实验室, 江苏 南京 210023 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项（2017ZX07204002） |
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| 摘 要： | 氧化亚氮的释放已经成为了一个全球性的环境问题，水体中N2O的释放量会随着氮含量的增加而增加.本文通过微宇宙系统的构建，分析氮的转化过程和氮转化基因的变化，并结合结构方程模型分析了温度、氨氮含量对水体N2O释放的贡献.研究结果发现氨氧化古菌和反硝化细菌丰度均与N2O释放呈正相关，表明水体中的硝化和反硝化作用都会造成N2O的释放.氨氮浓度的升高并不直接促进N2O的释放，而温度和通过硝化作用产生的硝态氮对N2O的释放有促进作用.此外，硝化速率通过促进亚硝态氮和反硝化菌的丰度而间接地促进N2O的释放.
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| 关 键 词： | 氧化亚氮 温度 硝化 反硝化 结构方程模型 |
| 收稿时间： | 2018-06-19 |
Coupling effect of temperature and ammonia on N2O emission in surface water |
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| LU Jun-ling,CHEN Hui-ping,XIAO Lin.Coupling effect of temperature and ammonia on N2O emission in surface water[J].China Environmental Science,2019,39(1):330-335. |
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| Authors: | LU Jun-ling CHEN Hui-ping XIAO Lin |
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| Institution: | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China |
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| Abstract: | The increase of nitrous oxide emission has become a worldwide problem. The emission of nitrous oxide from water body increased with the increase of N inputs. Our study analyzed the roles of temperature and ammonia in N2O emission through quantification of nitrogen transformation and related functional genes. The results showed that the abundance of ammonia oxidizing archaea and denitrifiers positively correlated to N2O emission in water. Structural equation model revealed ammonia content had no direct effect on N2O emission, however, high temperature and nitrification directly accelerated the release of N2O. In addition, nitrification process also increased the release of N2O indirectly through promoting abundance of denitrifiers and nitrite content. |
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| Keywords: | nitrous oxide temperature nitrification denitrification structural equation mode |
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