TABLE 1

Statistical tests of treatmentsa

Community and treatmentCopperDroughtShade
Root
    Control5.3 × 10−3,b 5.1 × 10−12.8 × 10−6,c 5.5 × 10−3b1.4 × 10−10,c 4.4 × 10−2d
    Copper7.2 × 10−2, 2.7 × 10−3b5.5 × 10−2, 6.9 × 10−1
    Drought1.4 × 10−3,b 7.4 × 10−1
Rhizosphere
    Control1.0 × 10−2,d 1.3 × 10−15.2 × 10−7,c 3.2 × 10−8c1.7 × 10−10,c 1.1 × 10−11c
    Copper1.3 × 10−3,b 4.2 × 10−7c3.4 × 10−1, 1.7 × 10−2d
    Drought4.9 × 10−7,c 5.5 × 10−7c
  • a Results of 999 Monte Carlo permutations to determine the significance of differences between weighted UniFrac distance metrics for communities subjected to different treatments. The first value is the result of a pairwise test of distance within a column treatment compared to the distance between column and row treatments. The second value is for the distance within a row treatment compared to the distance between row and column treatments.

  • b P < 0.01.

  • c P < 0.001.

  • d P < 0.05.