Mechanisms of mitigating nitrous oxide emission during composting by biochar and calcium carbonate addition

被引：7
作者：
Yang, Xinyi [1 ,2 ,3 ]
Duan, Pengpeng [1 ,2 ,3 ]
Cao, Yubo [4 ]
Wang, Kelin [1 ,2 ,3 ]
Li, Dejun [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China
[2] Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Guangxi Key Lab Karst Ecol Proc & Serv, Huanjiang 547100, Peoples R China
[3] Chinese Acad Sci, Inst Subtrop Agr, Inst Ctr Shared Technol & Facil, Changsha 410125, Peoples R China
[4] Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Key Lab Agr Water Resources,Hebei Key Lab Soil Eco, Shijiazhuang, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2023年 / 388卷
基金：
中国国家自然科学基金;
关键词：
N2O production pathways; Isotopocule approach; Inhibitors; Biochar; CaCO3; N2O PRODUCTION; FUNGAL; AMMONIA; BACTERIAL; SOIL;
D O I：
10.1016/j.biortech.2023.129772
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
To investigate the mechanisms underlying effects of biochar and calcium carbonate (CaCO3) addition on nitrous oxide (N2O) emissions during composting, this paper conducted a systematic study on mineral nitrogen (N), dissolved organic carbon (C) and N, sources of N2O, and functional genes. Biochar and CaCO3 addition decreased N2O emissions by 26.5-47.8% (9.5-96.9 mg N kg(-1) dw) and 13.9-37.4% (12.0-121.0 mg N kg(-1) dw) compared to the control (14.3-179.7 mg N kg(-1) dw), respectively. The mitigation of N2O emission was caused by decreased contribution of ammonia-oxidizing bacteria (AOB) and fungi to N2O production due to diminished AOB amoA, fungal nirK and P450 gene abundances, or by stimulated N2O reduction to N-2 owing to increased abundances of nosZI and nosZII genes under biochar and CaCO3 addition. The findings suggest that the addition of biochar or CaCO3 is effective in mitigating N2O emission during composting.
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页数：9
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