Influence of carbon-to-phosphorus ratios on phosphorus fractions transformation and bacterial community succession in phosphorus-enriched composting

•C/P at 50 could promote AP accumulation in P-enriched composting.•High C/P was beneficial for increasing MBP in P-enriched composting.•Initial C/P affected the topology structure of bacterial co-occurrence network.•Mesorhizobium and Pseudomonas were identified as core species for AP transformation.•C/P indirectly affected bacterial P cycle genes to regulate AP and MBP accumulation.