Change of Core Microorganisms and Nitrogen Conversion Pathways in Chicken Manure Composts by Different Substrates to Reduce Nitrogen Losses

In this study, the effects of sawdust + hulls (CK) and rice straw stalks + mushroom waste (T1) as auxiliary materials on nitrogen as well as microbial structure in the composting process when composted with chicken manure were investigated. At the end of composting, the nitrogen loss of T1 was reduced by 17.18% relative to CK. Spearman correlation analysis shows that Truepera, Pseudofulvimonas and Aequorivita were positively correlated with total nitrogen in CK, while Acinetobacter positively correlated with total nitrogen in T1. Analysis of the relationship between the two groups of core microorganisms and the environment revealed that the core microorganisms (Enterococcaceae) in both groups showed opposite trends to the TN in the compost. When straw + mushroom waste was used as a composting substrate, it could increase the enzyme activity of nitrogen assimilation and reduce the enzyme activity of the denitrification pathway