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Table 4 Summary statistics and parameter estimates for multiple regression models of stand BAI including average environmental indicators of site fertility and the effects of stand stocking and developmental stage (Eq. 4 without temporal change effect) for the eight species under study

From: Recent growth changes in Western European forests are driven by climate warming and structured across tree species climatic habitats

 

Variables

P. abies

A. alba

P. sylvestris

F. sylvatica

Q. robur

Q. petraea

Q. pubescens

P. halepensis

Statistics

RSE (m2 ha1 5 years−1)

0.41

0.41

0.43

0.41

0.38

0.33

0.41

0.40

Adj. R 2 (%)

50

42

49

43

42

46

48

49

Stand dynamics

Intercept

4.78

***

4.17

***

2.42

***

4.61

***

−1.30e01

***

9.38

***

−2.47e-2

−3.88e-1

ln RDI

7.23e-1

***

7.55e-1

***

6.74e-1

***

6.40e-1

***

7.50e-1

***

7.57e-1

***

7.21e-1

***

7.61e-1

***

ln H0

−9.25e-1

***

−8.99e-1

***

−1.27

***

−9.35e-1

***

−7.91e-1

***

−8.12e-1

***

4.73e-2

−1.13

***

1/H0

  

−1.31e1

***

3.05e-3

***

   

−7.07

**

Nutritional status

C:N

    

−9.59e-3

  

2.39e-1

*

pH

  

−1.54e-1

***

  

−1.14

***

  

Water status

SWC

3.43e-3

***

−1.91e-3

      

ln SWC

    

3.54e-1

***

−1.16

***

1.86e-1

***

 

CWB11

   

−4.65e-4

*

    

CWB1–2

  

3.78e-3

***

     

CWB1–22

  

−9.87e-6

***

     

SWD7

 

6.27e-3

***

      

SWB8

  

7.32e-3

***

     

Radiations

Rad9–4

   

−5.07e-5

***

    

Rad10–4

 

−2.21e-5

***

      

Rad11–12

     

−4.66e-5

***

  

Rad11–2

−2.30e-5

***

       

Rad4

    

6.64e-4

***

   

Rad42

    

−7.34e-9

***

   

Minimum temperatures

Tn10–2

  

4.65e-2

***

     

Tn11–3

      

5.63e-2

***

 

Tn12

     

3.07e-2

***

  

Tn122

     

−2.20e-2

***

  

Tn3–4

8.75e-2

***

       

Tn3–42

−9.97e-3

***

       

Maximum temperatures

Tx10–2

   

−7.62e-2

***

    

Tx2–3

       

3.88e-1

***

Tx4

   

9.02e-2

***

    

Tx5

 

2.87e-2

      

Tx6

  

3.62e-1

***

     

Tx62

  

−9.01e-3

***

     

Interactions

Tx5 x SWC

 

4.21e-4

*

      

SWC x SWD7

 

−7.67e-5

***

      

pH x ln SWC

     

2.51e-1

***

  

Tx2–3 x C/N

       

−0.01918

*

  1. Significance levels (p values): <0.1; *<0.05; **<0.01; ***<0.001. Variable units are given in Table 2. Adj. R 2 is the adjusted coefficient of determination
  2. RSE the residual standard error (m2/ha/5 years)
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Annals of Forest Science

ISSN: 1297-966X