Abstract：To explore the effect of the microbial community on phosphorus speciation in the sediment from plateau lake, the lakeside sediments from Caohai were collected, then the phosphorus speciation was analyzed, and the community compositions of bacteria and archaea were investigated using high-throughput sequencing. The results showed that the total phosphorus content in the sediments ranged from 662.89 to 881.26 mg/kg, with an average of 750.36mg/kg. Among the phosphorus fractions, NaOH- NRP>Res-P>BD-P>HCl-P>NaOH-SRP>NH4Cl-P. The bacterial community consisted of 59 phyla (dominated by Proteobacteria) and 1259 genera (dominated by Thiobacillus and Anaeromyxobacter). The archaeal community consisted of 8 phyla (dominated by Crenarchaeota) and 67 genera (dominated by Methanosaeta). The redundancy analysis, principal component analysis, and co-occurrence network analysis revealed that the microbial community could drive the transformation of the phosphorus speciation in lakeside sediments from Caohai. The bacteria affected the phosphorus species mainly through regulating the activity of alkaline phosphatase and the oxidation/reduction of iron, while the archaea impacted it by changing organic matter and acid phosphatase.
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