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Mechanisms of mitigating nitrous oxide emission during composting by biochar and calcium carbonate addition. | LitMetric
To investigate the mechanisms underlying effects of biochar and calcium carbonate (CaCO) addition on nitrous oxide (NO) emissions during composting, this paper conducted a systematic study on mineral nitrogen (N), dissolved organic carbon (C) and N, sources of NO, and functional genes. Biochar and CaCO addition decreased NO emissions by 26.5-47.8% (9.5-96.9 mg N kg dw) and 13.9-37.4% (12.0-121.0 mg N kg dw) compared to the control (14.3-179.7 mg N kg dw), respectively. The mitigation of NO emission was caused by decreased contribution of ammonia-oxidizing bacteria (AOB) and fungi to NO production due to diminished AOB amoA, fungal nirK and P450 gene abundances, or by stimulated NO reduction to N owing to increased abundances of nosZⅠ and nosZⅠⅠ genes under biochar and CaCO addition. The findings suggest that the addition of biochar or CaCO is effective in mitigating NO emission during composting.
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