The electrochemical mechanism of biochar for mediating the product ratio of N2O/(N2O+N2) in the denitrification process

文献类型： 外文期刊

第一作者： Liu, Xiaowan

作者： Liu, Xiaowan;Liu, Xingren;Gao, Shangjie

作者机构：

关键词： Biochar; Denitrifying microorganisms; Electrochemical properties; Oxygen-containing functional groups; N2O/(N2O+N2) ratio

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 951 卷

页码：

收录情况： SCI

摘要： The biochar electrochemical properties and surface functional groups significantly impact N2O 2 O production and reduction during denitrification process. However, its effects on N2O 2 O emissions during the denitrification process and its electrochemical mechanisms remain unclear. The study examined the impact of pristine and oxidized biochar combined with two types of nitrogen fertilizers on the N2O/(N2O 2 O/(N 2 O + N2) 2 ) ratio and N2O 2 O emissions in an incubation experiment with seven treatments: (1) CK (no application of chemical fertilizer); (2) N1 1 (applying (NH4)2SO4); 4 ) 2 SO 4 ); (3) N1B 1 B ((NH4)2SO4 4 ) 2 SO 4 + pristine biochar); (4) N1BO 1 B O ((NH4)2SO4 4 ) 2 SO 4 + oxidized biochar); (5) N2 2 (applying KNO3); 3 ); (6) N2B 2 B (KNO3 3 + pristine biochar); (7) N2BO 2 B O (KNO3 3 + oxidized biochar). The study found that in comparison with applying nitrogen fertilizer alone, combining pristine biochar decreased soil N2O 2 O concentration by 7.1 %-85.8 %, while combining oxidized biochar increased it by 15.7 %-125.6 %. Applying pristine biochar reduced N2O/(N2O 2 O/(N 2 O + N2) 2 ) ratio by 10.4 %-86.2 %, whereas applying oxidized biochar increased it by 12.9 %- 121.6 %. The application of pristine biochar increased the nosZ gene abundance and decreased the ( nirS + nirK)/ )/ nosZ ratio, which contributed to reducing N2O 2 O to N2. 2 . Compared with oxidized biochar, the oxygen-containing functional groups of pristine biochar decreased by 46.6 %, and it possessed a higher specific surface area (23.01 m2 2 g-1)-1 ) and electrical conductivity (0.003 mS cm-1 ). The correlation analysis showed that DOC and inorganic nitrogen were the key environmental factors affecting N2O 2 O emissions. Additionally, the electrical conductivity, specific capacitance, and oxygen-containing functional groups of the biochar were identified as the main factors driving N2O 2 O emissions. The SEM analysis suggested that the indirect influence of biochar electrochemical properties on N2O 2 O emissions was greater than its direct influence. Our work provides fresh perspectives on reducing soil N2O 2 O emissions and establishes a theoretical foundation for the subsequent prep- aration of biochar materials with enhanced N2O 2 O reduction capabilities.

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