Objective  Soil microorganisms play a very important role in reflecting the influence of above-ground vegetation on soil, so the community structure of microorganism is needed to be clarified in soil.

  Method  the microbial community structures were analyzed in soils of 4 stands in Yulin Sand Area.

  Result  The results showed that Sequencing yielded a total of 15,509 effective operational taxonomic units (OTU) and apparent differences were not observed from the OTUs among stands or the diversity indicators of each unit. Dominant strain species presented large fluctuations in different soil layers, while converged among different stands. Their abundances varied considerably in different soil layers and the top-five dominant species included Proteobacteria, Actinobacteria, Acidobacteria, Firmicutes, and Chloroflexi. In the forest soils of P.sylvestris and P.tabulaeformis, Acidobacteria’s proportion maximized at 22.32% and 29.02% separately. In the forest soils of S.psammophila and C.microphylla, Proteobacteria became dominant and accounted for 27.64% and 28.51%, respectively. Proteobacteria and Actinobacteria owned higher proportions in shrub forest soils than that in arboreal forest soils.

  Conclusion  Despite of the slight abundance differences of dominant species among different stands, the differences were not significant (P < 0.05).The insignificant difference between forest stands showed that the microbial community structure in a certain area was more affected by the soil background. The influence of different seasons or changes in soil temperature and humidity on the microbial community structure will be eliminated after a period of time, and the community structure will be stable.