SALINE-ALKALINE SOIL BACTERIAL COMMUNITY STRUCTURE AND DIVERSITY ANALYSIS UNDER DIFFERENT PATTERNS OF LAND-USE IN A LAKE WETLAND IN SONGNEN PLAIN, CHINA

In this study, the saline-alkaline soil samples were collected from Gudahu Wetland in Songnen Plain, China, in May (dry season) and July (rainy season), 2018. The soil bacterial community structure and diversity in the original meadow, lake dam, cropland, and woodland were analyzed using high-throughput sequencing technology. The results showed that Proteobacteria were the dominant bacterial phylum during the two seasons. Except for an unclassified group at the generic level, Pseudomonas showed the highest relative abundance. The lake dam's soil bacterial community diversity was the lowest, followed by the original meadow, while those of cropland and woodland were higher. The soil bacterial community structures differed among the four land-use patterns. Cropland and woodland showed the highest differences in soil bacterial community structure compared to the original meadow than the lake dam. In contrast to cropland and woodland, soil bulk density, electrical conductivity, and pH had a higher impact on the bacterial community diversities of the original meadow and the lake dam. Dam construction, cultivation, and afforestation in the saline-alkaline lake wetland of Songnen Plain changed the physicochemical properties of soil from the original meadow. It affected the bacterial community structure and diversity.