若尔盖国家自然公园四川片区不同生境下 土壤细菌群落结构及多样性分析.

[Objective] The paper aimed to reveal the community structure and species diversity of soil bacteria in different habitats of the Sichuan section of Zoige National Natural Park. [Method] The study employed high-throughput sequencing technology to study the diversity and community structure of soil bacteria in the soils from five different habitats (subalpine meadow soil, cinnamon soils, bog soils, aeolian soils and meadow soils) in the Sichuan section of Zoige National Park and discussed the relationship between soil physicochemical properties and microbial community structure. [Result] (i) The taxonomic analysis of soil bacteria revealed the identification of 36 phyla, with the dominant bacteria encompassing Actinobacteriota, Proteobacteria, Firmicutes, Acidobacteriota and Chloroflexi. (ii) In a-diversity analysis, subalpine meadow soils (YGS) showed the highest Chaol, Observed Species, Shannon and Simpson index, indicating the highest bacterial community richness and diversity in soil. (iii) In ẞ-diversity analysis, the high overlap among cinnamon soils (HT), bog soils (ZZT), YGS and aeolian soils (ST) suggested a similar composition of bacterial communities among these four soil types in the region, while meadow soils (CD) bacteria community showed significant differences (P<0.05). (iv) In RDA redundancy analysis of different habitats, Actinobacteriota showed a positive correlation with soil pH; Proteobacteria showed a positive correlation with soil pH and total potassium (TK); Firmicutes showed significant positive correlations with soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP) and moisture content (MC). [Conclusion] The research results reveal that the differences in the composition and diversity of soil bacterial communities in different habitats of the Sichuan section of Zoige National Natural Park, as well as the strong correlation of these differences with environmental factors. The finding not only contributes to a deeper understanding of soil microbial ecology but also provides a scientific basis for the management of soil ecosystems. [ABSTRACT FROM AUTHOR]