【摘要】 生物炭由于具有良好的微孔结构，较大的比表面积，被用于改善人工湿地内部环境，可实现强化脱氮和氧化亚氮（N₂O）减排，但生物炭对N₂O减排的途径尚不明晰。通过在温室内构建生物炭曝气潜流湿地（BW），以曝气潜流湿地（CK）作为对照，采用化学抑制剂法，量化湿地中N₂O的排放途径，探究生物炭对N₂O的减排效应。结果表明，生物炭投加可以显著提高湿地脱氮效率（p<0.05）。CK和BW系统N₂O的平均释放量分别为17.62 mg·（m²·d）^-1和10.45 mg·（m²·d）^-1,30%的生物炭投加可实现N₂O减排40.69%。化学抑制剂实验表明，湿地系统中硝化和反硝化作用对N₂O释放的贡献率分别为43.48%和34.81%。生物炭的添加可使上述2个主要脱氮过程的N₂O减排43.20%和71.93%。本研究可为污水处理流程的碳减排提供参考。更多还原

【Abstract】 Biochar is used to improve the internal environment of constructed wetlands, achieving nitrogen removal enhancement and nitrous oxide（N₂O） emission reduction, due to the microporous structure and huge specific surface area. However, the way of N₂O emission reduction by biochar is not clear yet. In this experiment, the aeration subsurface flow constructed wetland with biochar（BW） was built in the greenhouse,using the one without biochar（CK） as control. The chemical inhibitor method was used to quantify the N₂O emission pathway and explore the reduction effects of biochar on N₂O. The results revealed that biochar addition could significantly improve the nitrogen removal efficiency（p <0.05）. The average release of N₂O in CK and BW were 17.62 mg·（m²·d）^-1 and 10.45 mg·（m²·d）^-1, respectively, and 30% biochar addition would reduce N₂O emissions by 40.69%. Chemical inhibitor tests showed that the contribution of nitrification and denitrification to N₂O release were 43.48% and 34.81%, and the addition of biochar could reduce the N₂O emission by 43.20%and 71.93%, respectively, in these two major nitrogen removal processes.更多还原