This study aimed to reveal the potential mechanism of influence exogenous cellulose-degrading bacteria (ECDB) exerted on humus synthesis during the co-composting of corn straw and cattle manure. By measuring the changes in physicochemical factors and bacterial communities, it was revealed that inoculation with ECDB enhanced the driving force of cellulose degradation and humus synthesis. ECDB not only directly participated in cellulose degradation as degrading bacteria, but also changed the bacterial community succession, and increased the abundance of bacterial communities associated with cellulose degradation. The results showed that ECDB stimulated the potential functions and interactions of bacterial communities. Structural equation modeling confirmed that ECDB acted mainly as a bioactivator to promote humus formation in co-composting of corn straw and cattle manure. Taken together, these findings offered new strategies which can be effectively utilized to increase the efficiency and quality of corn straw composting.

本研究旨在揭示外源纤维素降解菌（ECDB）对玉米秸秆和牛粪共同堆肥过程中腐殖质合成的影响的潜在机制。通过测量理化因子和细菌群落的变化，发现接种ECDB增强了纤维素降解和腐殖质合成的驱动力。ECDB不仅作为降解菌直接参与纤维素降解，而且改变了细菌群落演替，增加了与纤维素降解相关的细菌群落的丰度。结果表明，ECDB刺激了细菌群落的潜在功能和相互作用。结构方程模型证实，ECDB 主要作为生物活化剂，在玉米秸秆和牛粪的共同堆肥中促进腐殖质的形成。总之，这些发现提供了新的策略，可以有效地用于提高玉米秸秆堆肥的效率和质量。