本实验采用的研究方法是通过16SRNA基因测序来进行菌种鉴定，利用土壤

The research method used in this experiment is to identify strains through 16SRNA gene sequencing, use the isolated and purified bacterial strains in the soil, extract bacterial DNA, perform PCR amplification, and finally determine the strain type through genetic comparison

The research method used in this experiment is to identify the strains by 16srna gene sequencing, extract the bacterial DNA from the isolated and purified bacterial strains in the soil, amplify it by PCR, and finally determine the strain type by gene comparison

The research method used in this experiment is to identify strains by sequencing 16SRNA gene, extract bacterial DNA from isolated and purified bacterial strains in soil, and amplify by PCR. Finally, the strain type is determined by gene comparison.