Mutualistic microorganism composition and application thereof

The invention relates to the technical field of microorganisms, in particular to a mutualistic microorganism composition and application thereof. The oligonitrogen bacterium E5 capable of degrading the petroleum is obtained through separation, belongs to pandoraea and has a certain petroleum degrading capacity. The invention further provides a combination of the Pandoraea E5 and the nitrogen-fixing bacteria PJ 12, after the two strains are combined, the petroleum degradation capability of the Pandoraea E5 can be effectively improved, and particularly, the efficiency of degrading various alkanes and aromatic hydrocarbons in petroleum is remarkably improved. The combination of the pandoraea E5 and the nitrogen-fixing bacteria PJ 12 provided by the invention can realize supply of nitrogen demand by virtue of a synergistic matrix between the two, a continuous and stable carbon-nitrogen interaction microenvironment is formed, meanwhile, the petroleum degradation efficiency is further improved, and the Pandoraea E5