文献类型： 外文期刊

作者： Zheng, Xuebo ¹ ; Cong, Ping ¹ ; Singh, Bhupinder Pal ² ; Wang, Hailong ³ ; Ma, Xiaogang ¹ ; Jiang, Yuji ⁴ ; Lin, Yongxin ⁵ ; Dong, Jianxin ¹ ; Song, Wenjing ¹ ; Feng, Yanfang ⁶ ; Xing, Baoshan ⁷ ;

作者机构： 1.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Tobacco Biol & Proc, Tobacco Res Inst, Qingdao 266101, Peoples R China

2.Univ New England, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia

3.Foshan Univ, Biochar Engn Technol Res Ctr Guangdong Prov, Sch Environm & Chem Engn, Foshan 528000, Peoples R China

4.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

5.Fujian Normal Univ, Sch Geog Sci, State Key Lab Subtrop Mt Ecol, Minist Technol & Fujian Prov, Fuzhou 350007, Peoples R China

6.Jiangsu Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Agroenvironm Downstream Yangze Plain, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

7.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

关键词： Biochar-loaded ammonium-nitrogen; Nitrous oxide; Ammonia-oxidizing bacteria; Ammonia-oxidizing archaea; nosZ gene

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：6.9 ）

ISSN： 2352-1864

年卷期： 2024 年 33 卷

页码：

收录情况： SCI

摘要： Biochar has been extensively demonstrated as an abundant, cost-effective, and highly efficient adsorbent material for removing ammonium (NH4+) from non-point source-polluted water. The new technology of biochar-loaded NH4+-N (BLN) is urgently needed. However, the underlying mechanisms of BLN in regulating N2O emissions by substituting chemical fertilizer nitrogen (CFN) were poorly understood. Based on the substitution rate of CFN with BLN, a soil column experiment was designed with six treatments: CFN-only (BLN0), 20% BLN plus 80% CFN (BLN20), 40% BLN plus 60% CFN (BLN40), 60% BLN plus 40% CFN (BLN60), 80% BLN plus 20% CFN (BLN80), and BLN only (BLN100). BLN application significantly decreased cumulative N2O emissions by 20.50-40.78% compared to the BLN0 treatment. The optimal ratio of CFN substitution was 66.10%, which was supported by the lowest N2O emissions in the BLN60 treatment. In BLNtreated soil, the abundance of nosZ played a dominant role in N transformation, followed by ammonia-oxidizing bacteria (AOB). Particularly, BLN60 significantly increased nosZ abundance. The high substitution ratio (BLN60-100) promoted N2O reduction by increasing the overall abundance of nosZ-harboring communities, however, low substitution ratio (BLN0-40) promoted it by increasing nosZ cluster IX abundance and the connectivity of operational taxonomic units within the module. Soil pH and C/N ratio were critical influencing factors to alter the nosZ community structure. These findings highlighted that BLN substitution treatments reduced N2O emissions, while the microbiological mechanism of emission reduction varied with the proportion