The aim of this study was to identify the effects of ammonia-oxidizing bacteria (AOB) inoculation on humus formation. Both nitrogen conversion and humus formation were considered as the main processes, because NH4+-N-like compounds not only substrates of nitrification, but also precursors of humus. During composting, the inoculation of AOB indeed increased humus concentration by fixing NH3 emission as NH4+-N, but it has also promoted nitrogen transformation. While the main reason was the changed bacteria community structure caused by inoculating AOB. Moreover, the relationship between bacteria and nitrogen transformation and humus formation has become closer. And bacteria were more likely to synthesize humus. Therefore, it is conjectured that AOB inoculation could not only provide NH4+-N for humus formation, but also enhance the anabolism of microorganisms. This suppose has been confirmed by structural equation model in this study. Therefore, AOB inoculation has a driving effect on promoting humus formation.

中文翻译：

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在混合物料堆肥过程中，由氨氧化细菌驱动的腐殖质形成。

这项研究的目的是确定接种氨氧化细菌（AOB）对腐殖质形成的影响。氮的转化和腐殖质的形成均被认为是主要过程，因为类似NH4 + -N的化合物不仅是硝化的底物，而且是腐殖质的前体。在堆肥过程中，AOB的接种通过将NH3排放固定为NH4 + -N确实增加了腐殖质浓度，但也促进了氮的转化。主要原因是接种AOB引起细菌群落结构改变。此外，细菌与氮转化和腐殖质形成之间的关系也越来越紧密。而且细菌更容易合成腐殖质。因此，推测AOB接种不仅可以为腐殖质形成提供NH4 + -N，而且还增强了微生物的合成代谢。该假设已通过结构方程模型在本研究中得到证实。因此，接种AOB对促进腐殖质形成具有驱动作用。