Objective This paper aims to elucidate the impacts of soil bacterial community structure after Phyllostachys edulis invaded Cunninghamia lanceolata forest, and reveals the relationship between bacterial community diversity and structure and forest types as well as soil environment factors.

Method Illumina MiSeq high throughput sequencing and OTU analysis were used to assess the soil bacterial community structure and its correlation with soil physical and chemical factors in Cunninghamia lanceolata forest invaded by Phyllostachys edulis （CP） to compare with that in Phyllostachys edulis forest （PF） and Cunninghamia lanceolata forest （CF）.

Result A total of 2939 OTU soil bacteria of 36 phyla, 108 classes, 241 orders, 354 families, 552 genera were obtained from this 3 forest stand samples, among them Acidobacteria, Proteobacteria, Chloroflexi were the predominant bacterial phyla, accounting for 71.15%-76.07%. The relative abundance of Acidobacteria in CF and CP was significantly higher than that in PF（P<0.05）, the relative abundance of Proteobacteria in CF was significantly lower than that in other two forests, the relative abundance of Chloroflexi in CF was significantly higher than that in PF. The bacteria with relative abundance of more than 1% identified in the 3 forest sample plots are: Acidobacteriia, Alphaproteobacteria, Ktedonobacteria, Planctomycetes, Gammaproteobacteria, Actinobacteria, Thermoleophilia, Vicinamibacteria and Acidimicrobiia, Acidobacteriia and Alphaproteobacteria are two dominant classes. The bacterial genera with relative abundance of more than 1% identified in the 3 forests are: HSB_OF53-F07, Acidothermus, Candidatus Solibacter, Acidobacterium, Bryobacter and Bradyrhizobium. Spearman correlation analysis between dominant bacterial genera and soil environmental factors showed that, soil water content and available phosphorus are the main factors affecting soil bacterial community.

Conclusion The invasion of Phyllostachys edulis into the Cunninghamia lanceolata forest has a significant impact on the soil bacterial community. The non-dominant bacteria isolated from the CP and the PF can provide an important reference for studying the changes of bacterial community during this intrusion process.