Analysis of bacterial community structure and influencing factors in the rhizosphere of Tibetan poplar in Duodigou
Populus szechuanica var.tibetica is a endemic tree species distributed at high-altitudes,which has impor-tant ecological and economic value.Rhizosphere microorganisms play a crucial role in plant growth and health.In this study,high-throughput 16S rDNA sequencing technology was used to analyze the bacterial communities in the rhizosphere and non rhizosphere soils of Tibetan Sichuan poplar in Duodigou.By comparing the differences in bacte-rial community composition between the rhizosphere and non rhizosphere soils,the bacterial community composition in different environments was explored to reveal the adaptive mechanism of Tibetan Sichuan poplar.The results indi-cated that,from the perspective of community composition,the bacterial community in the rhizosphere soil of Tibet-an Sichuan poplar includes 29826 OTUs,identified as 81 phyla,860 genus,and 533 species.Among them,Proteobac-teria was the dominant phylum of the rhizosphere bacterial community of Tibetan Sichuan poplar;Proteobacteria,ac-idobacteria,and Actinomycetes were dominant genus;Proteobacteria,acidobacteria,and bacteroidetes were the domi-nant species.From the relationship between bacterial community diversity and metal factors,Ti ions and Zr ions were significantly positively correlated with Simpson index and Pielou_e index in rhizosphere soil,respectively;In non rhi-zosphere soil,Zn ions were significantly positively correlated with Chao1 index;Mn ions were the most important in-fluencing factor of the community,and no significant correlation was found between other metal ions and the diversi-ty index.With the increase of altitude,the diversity of rhizosphere bacterial communities also increased.
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