Plant rhizosphere bacterial community structure in northern Tibetan alpine grassland shows host preference

The Qiangtang area in northern Xizang is a typical alpine grassland ecosystem on the Qinghai-Xizang Plateau In this study, using high-throughput sequencing, bioinformatics methods, and analysis of the bacterial diversity characteristics of the non-rhizosphere soil and rhizosphere soil of dominant plants in the alpine grassland in northern Xizang, it was found that, compared to geographical and environmental factors, environmental factors had more effects on non-rhizosphere soil bacterial diversity than on plant rhizosphere bacterial diversity. The construction of soil bacterial communities in the rhizosphere showed stronger host preference than the communities in the non-rhizosphere soil. Additionally, stochastic processes played a more dominant role in soil bacterial community construction than deterministic processes did. The results of this study provide a theoretical basis for further revealing the adaptation mechanisms of rhizosphere bacteria and their symbiotic plants to extreme environments and the response mechanisms of these systems to global change.