The aim of this study is to reveal the roles of MnO₂ in Maillard reaction of biotic composting, and to identify its effectiveness in promoting humus formation. Corn straw (CS) and chicken manure (CM) have been chosen to be composted. During CS composting, addition of MnO₂ rapidly reduced reducing sugars concentration (decreased by 84.0%) in 5 days and significantly improved humus production by 38.7% compared with treatment without MnO₂. Whereas in CM composting, the promoting effect of MnO₂ on humus formation was relatively weak by comparing with the treatment group of CS. Additionally, the presence of MnO₂ has reshaped bacteria community, which might be the reason of MnO₂ stimulated bacteria to utilize organic matter during CM composting. Therefore, the structural equation modeling has confirmed that MnO₂ mainly performed as chemical catalyst to promote humus formation during CS composting. Besides catalyst, MnO₂ also played as a bioactive activator in CM composting.

这项研究的目的是揭示MnO ₂在生物堆肥的美拉德反应中的作用，并确定其在促进腐殖质形成中的有效性。玉米秸秆（CS）和鸡粪（CM）已被选择堆肥。与不使用MnO _2的处理相比，在CS堆肥过程中，添加MnO _2可以在5天之内迅速降低还原糖的浓度（降低84.0％），并使腐殖质产生显着提高38.7％。而在CM堆肥中，与CS处理组相比，MnO ₂对腐殖质形成的促进作用相对较弱。另外，MnO ₂的存在使细菌群落重塑，这可能是MnO ₂的原因。刺激细菌在CM堆肥过程中利用有机物。因此，结构方程模型已证实MnO ₂主要用作化学催化剂以促进CS堆肥过程中腐殖质的形成。除催化剂外，MnO ₂在CM堆肥中还起着生物活性活化剂的作用。