Afforestation of soils contaminated by potentially toxic element (PTE), notably with fast growing trees producing large biomass has been demonstrated to be an attractive option for their bioremediation. Mycorrhizal fungi form symbiotic associations with plants, contributing to their tolerance towards toxic elements and actively participating to the biorestoration processes. The aim of this study was to deepen understanding the mycorrhizal community in 2 PTE-contaminated sites (Pierrelaye and Fresnes-sur-Escaut, France) planted with poplar trees (P. trichocarpa x P. maximowiczii) in order to underline the environmental factors affecting the abundance, diversity and structure of microbial communities. The 2 sites (around 1 ha each) were divided into 4 replicated field blocks with a final plant density of 2200 tree h^-1. Half of the trees were inoculated with a commercial inoculum made of a mix of mycorrhizal species. The sites presented different physico-chemical characteristics and various PTE contamination levels (mostly Cd and Zn). Field inoculation had a significant positive effect on biomass production on the 2 sites; although the beneficial effect tended to decrease with time. We characterized the fungal communities using Illumina Miseq sequencing. Although, detailed study of the fungal composition demonstrated a predominance of Ascomycota at both sites, higher percentages were found in Pierrelaye soil. In general, the majority of OTUs for the 2 sites is shared between the two treatments, but Pierrelaye site showed higher homogeneity of OTUs distribution compared to Fresnes-sur-Escaut. Overall, 227 OTUs (≈29%) were shared by all habitats and the highest proportions of unique OTUs is observed in Pierrelaye soil (≈30%). Furthermore, mycorrhizal colonisation rate showed differences in percentage between treatments just for Pierrelaye site. Finally, fungal community appeared to be highly constrained by soil characteristics at the phytomanagement sites. The detailed distribution of fungal OTUs within the various phyla and guilds will be further discussed in the presentation.