Abstract
BackgroundThe saline-alkali soil area accounts for over 1/4-1/5 of the land area in Gansu Province of China, which are mainly distributed in the north of Hexi corridor and Jingtai basin. The unique ecological environment contains unique and diverse microbial resources. The investigation of microbial diversity in saline environment is vital to comprehend the biological mechanisms of saline adaption, develop and utilize microbial resources.ResultsThe Illumina MiSeq sequencing method was practiced to investigate the bacterial diversity and composition in the 5 subtypes and 13 genera of saline-alkali soil in Gansu Province, China. The results from this study show that Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Gemmatimonadetes were the dominant bacterial groups in 13 saline soil. Proteobacteria had the greatest abundance in sulfate-type meadow solonchaks and orthic solonchaks, chloride-type orthic solonchaks and bog solonchaks, sulfate-chloride-type, chloride-sulfate-type, and sulfate-type dry solonchaks. Halobacteria was the dominant bacterial class in soil samples except for sulfate-type meadow solonchaks and orthic solonchaks, chloride-type orthic solonchaks and bog solonchaks. The richness estimators of Ace and Chao 1 and the diversity indices of Shannon and Simpson revealed the least diversity in bacterial community in sulfate-chloride-type orthic solonchaks.ConclusionsThe sulfate anion was the most important driving force for bacterial composition (17.7%), and the second most influencing factor was pH value (11.7%).
Highlights
The saline-alkali soil area accounts for over 1/4-1/5 of the land area in Gansu Province of China, which are mainly distributed in the north of Hexi corridor and Jingtai basin
Soil biochemical characteristics There were significant differences (P < 0.01) in pH, Soil organic matter (SOM), Total salt content (TS), SO42−, Cl−, UA, alkaline phosphatase (APA), and DHA among soil samples collected from 13 sites (Table 1)
TS contents ranged from 3.81 to 24.35%, which far exceeded the thresholds of 0.2% [9], indicating a high hypersaline environment
Summary
The saline-alkali soil area accounts for over 1/4-1/5 of the land area in Gansu Province of China, which are mainly distributed in the north of Hexi corridor and Jingtai basin. The unique ecological environment contains unique and diverse microbial resources. Bacteria are the most abundant microorganisms in the soil [31] Their ecology, structure, diversity, and population dynamics are driven by soil physicochemical characteristics [12] such as soil organic carbon content [17], pH [11, 34], soil electrical conductivity [38], the plant secretion [32], trophic status [40], geographic distance [41], salinity [22], and types and concentrations of soil ions [19, 43]
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