Principal component analysis (α = 0.05) showing linear patterns of a wide range of variables across the ecological gradient (Sampling sites: MS = mining site, FE = forest edge, NF = naturel forest, and TN = Trecesson nursery) (only the axis 1 is significant; closer to center means smaller values) (MYC = % of roots colonized by ECM fungi).

<p>Principal component analysis (α = 0.05) showing linear patterns of a wide range of variables across the ecological gradient (Sampling sites: MS = mining site, FE = forest edge, NF = naturel forest, and TN = Trecesson nursery) (only the axis 1 is significant; closer to center means smaller values) (MYC = % of roots colonized by ECM fungi).