Pathways and biological mechanisms of N2O emission reduction by adding biochar in the constructed wetland based on 15N stable isotope tracing
文献类型： 外文期刊
作者： Huang, Lei 1 ; Xiong, Haifeng 1 ; Jiang, Chunli 1 ; He, Jinke 1 ; Lyu, Wanlin 1 ; Chen, Yucheng 1 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400715, Peoples R China
2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China
3.Chongqing Engn Res Ctr Rural Cleaner Prod, Chongqing 400716, Peoples R China
4.Southwest Univ, Coll Resources & Environm, 216 Tiansheng St, Chongqing 400716, Peoples R China
关键词： Constructed wetland; Biochar; Nitrous oxide; Emission pathway; Functional microbes; Enzyme activity
期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）
ISSN： 0301-4797
年卷期： 2023 年 342 卷
页码：
收录情况： SCI
摘要： Constructed wetlands (CWs) added with biochar were built to study pollutant removal efficiencies, nitrous oxide (N2O) emission characteristics, and biological mechanisms in nitrogen transformation. The results showed that biochar addition enhanced the average removal rates of ammonium (NH4+-N), total nitrogen, and chemical oxygen demand by 4.03-18.5%, 2.90-4.99%, and 2.87-5.20% respectively while reducing N2O emissions by 25.85-83.41%. Based on 15N stable isotope tracing, it was found that nitrification, denitrification, and simultaneous nitrification and denitrification were the main processes contributing to N2O emission. The addition of biochar resulted in maximum reduction rates of 71.50%, 80.66%, and 73.09% for these three processes, respectively. The relative abundance of nitrogen-transforming microbes, such as Nitrospira, Dechloromonas, and Denitratisoma, increased after the addition of biochar, promoting nitrogen removal and reducing N2O emissions. Adding biochar could increase the functional gene copy number and enzyme activity responsible for nitrogen conversion, which helped achieve efficient NH4+-N oxidation and eliminate nitrite accumulation, thereby reducing N2O emissions.
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