Bacterial community dynamics and co-occurrence network patterns during different stages of biochar-driven composting

•Bacterial community was tracked at four stages of biochar driven composting.•Biochar regulates bacterial community primarily acting in the thermophilic stage.•Predominant bacteria from the Proteobacteria shifted into Firmicutes in the thermophilic stage.•The 7.5 and 10% biochar amended composts has more cooperative and complex interactions.