Figure 1. Plot showing the top four bacterial taxa in each sample based on the mean value of relative OTU abundance in pristine and contaminated communities.

For the sample labels, the first two uppercase letters are site names abbreviation, followed by lowercase alphabet “b” and “p” specified the bottom active layer and upper permafrost, and last numeric suffix “0” or “3” indicates innate soils (without pollutants) and 30% (v/w) treatment, respectively.