Long term effects of Lespedeza bicolor revegetation on soil bacterial communities in Dexing copper mine tailings in Jiangxi Province, China

•Direct L. bicolor revegetation increased bacterial diversity.•Bacterial communities dominated by acid tolerant and nutrient regulated species.•Olsen-P and pH were main regulators of bacterial composition.•Long term L. bicolor revegetation facilitated bacterial community development in mine tailings.