TABLE 1 .

Statistical tests of treatments^a

Community and treatment	Copper	Drought	Shade
Root
Control	5.3 × 10−3,b 5.1 × 10−1	2.8 × 10−6,c 5.5 × 10−3b	1.4 × 10−10,c 4.4 × 10−2d
Copper		7.2 × 10−2, 2.7 × 10−3b	5.5 × 10−2, 6.9 × 10−1
Drought			1.4 × 10−3,b 7.4 × 10−1
Rhizosphere
Control	1.0 × 10−2,d 1.3 × 10−1	5.2 × 10−7,c 3.2 × 10−8c	1.7 × 10−10,c 1.1 × 10−11c
Copper		1.3 × 10−3,b 4.2 × 10−7c	3.4 × 10−1, 1.7 × 10−2d
Drought			4.9 × 10−7,c 5.5 × 10−7c

^aResults 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.

^bP < 0.01.

^cP < 0.001.

^dP < 0.05.