数字农科院2.0

Co-application of porous biochar and Fe2O3 in cattle manure and wheat straw composting: mechanistic insights into greenhouse gas mitigation and nitrogen transformation

文献类型： 外文期刊

作者： Xu Yang;Cong Shao;Xuan Wu;Wenxin Zhang;Kuok Ho Daniel Tang;Xiu Zhang;Junting Pan;Ronghua Li

作者机构：

关键词： Aerobic composting;Greenhouse gases;Mechanisms;Nitrogen fixation;Porous biochar and Fe2O3

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2025 年 394 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： This research assessed the effect of porous biochar and Fe2O3 amendments on GHG emissions and nitrogen conservation during 42-day aerobic co-composting of cattle manure with wheat straw. Four treatments included control (CL), 5 % biochar (PB), 5 % Fe2O3 (FO), and 5 % biochar + 5 % Fe2O3 (FB). Among the treatments, FO significantly increased CO2 and CH4 emissions by 30.92 % and 48.26 %, respectively, compared to CL, but significantly reduced NH3 and N2O emissions by 548.53 % and 652.28 %. All treatments enhanced the Total Kjeldahl Nitrogen (TKN) content compared to initial levels, with increases of 82.64 %, 84.22 %, 84.26 %, and 84.52 %, respectively. FO also notably increased the concentrations of ammonia sugar nitrogen (ASN) and amino acid nitrogen (AAN) in the final compost product. Microbial analysis showed that FO increased the relative abundance of nitrogen-fixing microbes, specifically Thermobacillus and Pseudomonas. Functional predictions via PICRUSt 2 revealed that FO significantly upregulated the activities of ammonia monooxygenase and hydroxylamine dehydrogenase during the maturation phase by 84.41 % and 2097.56 %, respectively, while suppressing denitrification-related enzymes such as nitric oxide reductase (cytochrome c) and nitrite reductase (NO-forming). Meanwhile, FO boosted nitrous oxide reductase activity by 403.25 % and glutamate-ammonia ligase activity by 13.50 %, thereby promoting organic nitrogen fixation. However, FB did not exhibit a significant advantage over FO in reducing N2O emissions. Mechanistically, this was linked to the inadequate suppression of nitric oxide reductase (cytochrome c) activity and the failure to synergistically enhance nitrous oxide reductase activity when combining Fe2O3 with biochar. Overall, this study elucidates the distinct roles of Fe2O3 and biochar in regulating nitrogen dynamics and GHG emissions during composting, offering new insights into the application of Fe2O3 for pollution mitigation and nitrogen retention.

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