Table 1 Inter-host species variabilities in bacterial Shannon diversity and the correlation between bacterial Shannon diversity and elevation, tree traits, based on step-wise linear regression. Samples have been rarefied to 10,312 reads/sample

Tree species birch

4.07

0.30

13.50

 < 0.01

0.42

F(4, 51) = 10.88

 < 0.01

Tree species oak

− 0.17

0.35

− 0.47

0.64

Tree species pine

− 0.61

0.43

− 1.43

0.16

Tree species spruce

− 1.76

0.37

− 4.77

 < 0.01

Interspecific

Bavaria

Coefficient

Std. Error

t

p-value

Adj. R²

F

p-value

Tree species spruce

0.92

0.08

11.11

 < 0.01

0.45

F(1, 146) = 123.3

 < 0.01

Spruce

Intra-specific

Coefficient

Std. Error

t

p-value

Adj. R²

F

p-value

Mg

− 0.0005

0.0001

− 3.8

 < 0.01

0.22

F(5,64) = 4.91

 < 0.01

Chlorophyll

0.0063

0.0035

1.77

0.08

Zn

0.0083

0.0038

2.18

0.03

P

− 0.0003

0.0002

− 2.01

0.048

N

0.3660

0.2268

1.61

0.11

Beech

Intra-specific

Coefficient

Std. Error

t

p-value

Adj. R²

F

p-value

Elevation

− 0.0021

0.0007

− 2.97

 < 0.01

0.09

F(2, 72) = 4.44

0.02

P

0.0003

0.0001

2.25

0.03