Fig. 2

Simpson’s (1 − D) diversity across broad habitats (leaf, stem, root, and soil—denoted in light gray) and genotypes (DD = P. deltoides, TD = P. trichocarpa × deltoides—denoted in dark gray) for both archaeal/bacterial and fungal communities. For both archaea/bacteria and fungi, diversity differed across habitats (p ≤ 0.01). Fungal diversity differed between genotypes (p ≤ 0.01). Letters denote significant differences based on Tukey’s HSD post hoc comparison tests. Diversity was arcsine square root transformed prior to analysis, but raw data average and standard errors per habitat and genotype are shown