DIVERSITY AND COMMUNITY ASSEMBLY OF ABUNDANT AND RARE BACTERIAL TAXA IN MINING AREAS

Rhizosphere microorganisms are closely related to plant growth.Due to a lack of systematic understanding of the diversity characteristics and assembly processes of soil microbial communities under human disturbance.This study investigated these parameters along with influencing factors of the rhizosphere soil in a mining area.We found that there was no significant difference in soil bacterial communities among different plants in this area.Soil organic matter (SOM) was the main parameter affecting α-diversity of rhizosphere soil bacterial communities, while total phosphorus (TP) and pH dominated variation of community structure.SOM and salinity were significantly positively correlated with α-diversity of abundant taxa, while soil environmental parameters were not significantly related to αdiversity of rare taxa.The β-diversity of rare taxa was significantly higher than that of abundant taxa, whereas abundant taxa had a wider niche.The assembly processes of both rare and abundant taxa were mainly stochastic.Dispersal limitation contributed the most to abundant taxa.Rare taxa were mainly determined by both dispersal limitation and undominated processes.These results broaden our understanding of the structure and ecological assembly mechanisms of rhizosphere bacterial communities in mining areas.