Structural Characteristics and Assembly Mechanisms of Soil Microbial Communities under Water-Salt Gradients in Arid Regions.

Main Environmental Factors Affecting the Structure of Soil Microbial Communities Bacterial OTUs were most strongly correlated with soil environmental factors, which included significant positive correlations with SOC, LAP, β-GC, NAG, and AKP ( p < 0.05) ( Table 1 ); pH was most strongly correlated with soil bacterial community structure, with the Chao index showing a highly significant negative correlation with pH ( p < 0.01), the Shannon index showing a significant negative correlation with pH ( p < 0.05) and the Bray–Curtis distance showing a significant positive correlation with pH ( p < 0.05) ( Table 1 ).

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Kocuria showed a trend of increasing relative abundance with the decreasing water–salt gradient.

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