[Patterns of Bacterial Community Through Soil Depth Profiles and Its Influencing Factors Under Betula albosinensis Burkill in the Xinjiashan Forest Region of Qinling Mountains].

were the most dominant bacteria. The relative abundance of Acidobacteria in 40-60 cm soil depth(62.88%) was higher than those in other soil depths. Proteobacteria in 0-10 cm(23.62%) was more abundant than that in 40-60 cm. The relative abundance of Acidobacteria was significantly correlated with the total N, soil organic carbon, C/N, and soil dissolved organic carbon. Soil water content, soil organic matter and soil dissolved organic carbon were the key factors affecting soil Proteobacteria. RDA sequencing results showed that soil dissolved organic carbon was the key factor contributing to the bacteria community abundance. The results demonstrated that there are plenty of bacterial distribution in all four soil layers, which provides a fundamental basis for vertical soil bacterial community diversity, and possesses very important research value in biogeochemical cycling.