数字农科院2.0

Differential contributions of microbial necromass to humic acid during composting of organic wastes

文献类型： 外文期刊

作者： Wenjie Chen;Yan Yang;Xia Liang;Su Chang;Yuan Chang;Nannan Miao;Ting Xu;Deli Chen;Yuquan Wei

作者机构：

关键词： Community function prediction;Fungal and bacterial necromass;Humification;Microbial driving mechanism;Precursors

期刊名称： Environmental Research

ISSN： 0013-9351

年卷期： 2025 年 270 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Microbial necromass is a crucial source of stable organic matter in composting, yet its role in the humification process remains poorly understood. This study aims to explore the contribution of microbial necromass carbon (MNC) to humic acid (HA) formation during the composting of sewage sludge (SS), kitchen waste (KW), and pig manure (PM), and to examine the involvement of fungal communities in microbial necromass humification. The results show that fungal necromass carbon (FNC) consistently contributes more to MNC than bacterial necromass carbon (BNC), with FNC accounting for over 60% of MNC across all treatments. KW exhibited the highest accumulation of FNC (4.09–98.92 g/kg), and its MNC contribution to total organic carbon was 23.63%, significantly higher than sewage sludge (5.57%) and pig manure (7.47%). The carbon-to-nitrogen (C/N) ratio was found to be a critical factor influencing microbial growth, necromass accumulation, and HA formation, with a lower C/N ratio promoting faster microbial turnover and enhancing MNC contribution to HA. The analysis also revealed that Ascomycota dominated the maturation phase, with a significant role in driving humification, especially in KW. Structural equation modeling confirmed that FNC and BNC are directly influenced by the C/N ratio, which in turn affects HA formation This study enhances our understanding of microbial necromass dynamics and its contribution to humic substance formation, providing valuable insights for improving compost quality and optimizing composting strategies for enhanced carbon sequestration.

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