Distinct Functions and Assembly Mechanisms of Soil Abundant and Rare Bacterial Taxa Under Increasing Pyrene Stresses.

Notably, along the increasing PAH concentrations in soil, the average niche width (8.83–11.05) of the community showed a trend of gradual increase ( Figure 4A ; ANOVA, p < 0.05).

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Interestingly, compared with Control, abundance of “Metabolism” showed an increasing trend along with increasing pollution concentrations no matter in abundant or rare bacterial taxa.

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With the increase of pollutant concentrations, the co-occurrence networks tended to be simplified, among which nodes and links showed a decreasing trend gradually ( Figure 3 ).

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