Percent difference (d-values) between microbial communities of different spiking treatments for different taxa and different sampling times (21 and 63 days after spiking [DAS]) per soil.

D-values were calculated based on pairwise Pearson similarity coefficients for the effect of phenanthrene (+P) in non-litter or litter-amended soils and the effect of litter (+L) in the absence or presence of phenanthrene. Bold numbers indicate significant differences (pPercent difference (d-values) between microbial communities of different spiking treatments for different taxa and different sampling times (21 and 63 days after spiking [DAS]) per soil.