Haishi Qi, Wenfang Gao, Lina Xie, Guogang Zhang, Caihong Song, Zimin Wei, Ning Hu, Tong Li
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引用次数: 0
摘要
本研究旨在加速腐殖化，并探讨二氧化锰改性生物炭（MBC）如何在鸡粪堆肥过程中促进腐殖质的形成。在本研究中，与对照组（CK）相比，添加 MBC 可提高腐殖质和腐殖酸（HA）的浓度，分别提高了 29.1% 和 37.2%。此外，MBC 还提高了堆肥产品的稳定性。异种二维相关光谱进一步表明，MBC 可以改变堆肥过程中腐殖质组分的形成机制。随机森林分析表明，微杆菌、乳杆菌、Kroppenstedtia、Gracilibacillus 和 Lentibacillus 与腐殖质的形成显著相关（P < 0.05）。在堆肥过程中，MBC 提高了这五个菌属的绝对丰度。结构方程模型进一步证实，这五个菌属可通过次生代谢产生芳香族化合物，从而间接参与腐殖质的形成。此外，这五种菌属还能直接将有机成分转化为大分子腐殖质结构。因此，这五种菌属的增加可能是对 MBC 堆肥过程中腐殖化加速的直接反应。亮点生物炭的二氧化锰改性改变了腐殖质组分的形成机制，确定了参与腐殖质形成的关键菌属，揭示了生物炭的二氧化锰改性、关键菌属和腐殖质形成。
Effect of MnO2-biochar composites on promoting humification during chicken manure composting
The present study aimed to accelerate the humification and to investigate how MnO2 modification of biochar (MBC) drives the humus formation during composting with chicken manure. In this study, compared with the control group (CK), the addition of MBC caused an increase in the concentration of both humus and humic acid (HA), with a respective enhancement of 29.1% and 37.2%. In addition, MBC also improved the stability of compost products. Hetero two-dimensional correlation spectra further exhibited that the MBC could alter the formation mechanism of humus fractions during composting. Random forest analysis showed that Microbacterium, Bacteroides, Kroppenstedtia, Gracilibacillus, and Lentibacillus were significantly related to humus formation (P < 0.05). MBC enhanced the absolute abundance of these five genera during composting. The structural equation model further confirmed that these five genera could be indirectly involved in humus formation, through the production of aromatic compounds via secondary metabolism. Additionally, these five genera could directly transform organic components into macromolecular humus structures. Therefore, the increase in these five genera might be a direct response to the acceleration of the humification during MBC composting. These findings demonstrate the potential value of MBC in harmless disposal of hazardous biowastes through composting.
Highlights
MnO2 modification of biochar changed the formation mechanism of humus fractions.
Key genera involved in humus formation were identified.
Among of MnO2 modification of biochar, key genera and humus formation were revealed.
期刊介绍：
Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.
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