Microbial communities and natural fermentation of corn silages prepared with farm bunker-silo in Southwest China

[Display omitted] •This is the first microbiome study of corn silage in hot and humid area.•Lactobacillu and Acetobacter spp. are dominant bacteria after ensiling.•Lactobacillus and Pediococcus spp. improve silage fermentation.•Acetobacter and Bradyrhizobium spp. are correlated to acetic acid produced.•Rainfall and humidity affect the microbial community of corn silage. This study analyzed the variation of microbial communities, their achieved fermentation quality, and the association between microbial diversity and environmental factors after ensiling of 96 samples prepared with bunker-silo in Southwest China. Most of natural corn silages achieved good fermentation, e.g., low pH value (