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Table 2 Regressions between the growth variable (ring width, ring area) and height along the stem

From: No matter how much space and light are available, radial growth distribution in Fagus sylvatica L. trees is under strong biomechanical control

Growth variable

Period

Treatment

Slope (mm/m or cm2/m)

Null slope (p value)

Period effect (p value)

Treatment comparison

p value

Ring width

2011–2014

TF

0.36

0.015

  

1

TG

0.25

0.068

  

uTF

0.35

0.004

  

uTG

0.41

0.001

  

2014–2018

TF

 − 0.27

0.060

0.001

TF-uTF

0.193

TG

1.37

0.000

 < 0.001

TG-uTG

 < 0.001

uTF

0.12

0.331

0.382

TF-TG

 < 0.001

uTG

0.64

0.000

0.406

uTF-uTG

0.010

Ring area

2011–2014

TF

 − 0.72

0.195

  

0.89

TG

 − 0.95

0.075

  

uTF

 − 1.23

0.009

  

uTG

 − 0.23

0.615

  

2014–2018

TF

 − 4.07

0.000

 < 0.001

TF-uTF

 < 0.001

TG

3.57

0.000

 < 0.001

TG-uTG

0.011

uTF

 − 1.22

0.010

1

TF-TG

 < 0.001

uTG

1.38

0.003

0.007

uTF-uTG

 < 0.001

  1. P values refer to the slope significance in the linear model (compared to zero) or Tukey contrasts (period and treatment effects). Significant values are in bold