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Table 2 Statistical parameters of the three best-performing linear mixed-effect models of tree-ring indices with one, two or three climate variables for site Schlossberg

From: Drought sensitivity of beech on a shallow chalk soil in northeastern Germany – a comparative study

 

Coefficients

ΔAICc

R2 (%)

 

p1

c1

p2

c2

p3

c3

  

Full period (1902–2009)

null model

     

-

0.0

pPPT_sm

0.09

    

204.6

7.4

pSHM

-0.09

    

207.1

7.5

pTmax07

-0.09

    

223.8

8.0

pTmax07

-0.07

pPPT_sm

0.07

  

341.6

12.0

pTmax07

-0.08

pMAP

0.07

  

374.8

13.1

pTmax07

-0.10

pPPT08

0.07

  

377.1

13.2

pTmax07

-0.09

pMAP

0.06

pbFFP

-0.05

451.4

15.6

pTmax07

-0.11

pPPT08

0.07

pNFFD

0.05

457.6

15.8

pTmax07

-0.11

pPPT08

0.06

pbFFP

-0.05

459.7

15.8

Early period (1902–1955)

null model

     

-

0.0

PPT_sp

0.09

    

110.9

8.0

pPPT_sm

0.09

    

115.1

8.3

PPT05

0.10

    

119.1

8.6

PPT_sp

0.10

pPPT06

0.10

  

247.2

17.0

PPT05

0.10

pPPT06

0.10

  

251.6

17.3

pPPT_sm

0.10

PPT_sp

0.10

  

267.1

18.2

PPT_sp

0.11

pPPT06

0.08

pPPT08

0.07

323.2

21.7

PPT_sp

0.11

pPPT06

0.10

Tmax06

-0.07

323.8

21.7

pPPT_sm

0.12

PPT_sp

0.09

pTmin11

0.07

330.3

22.1

Late period (1956–2009)

null model

     

-

0.0

pSHM

-0.10

    

132.4

9.5

pTave07

-0.10

    

148.1

10.5

pTmax07

-0.10

    

152.8

10.8

pTmax07

-0.11

pPPT08

0.07

  

228.1

15.8

pTave07

-0.10

PPT06

0.08

  

242.1

16.7

pTmax07

-0.11

PPT06

0.08

  

245.1

16.9

pTave07

-0.09

PPT06

0.08

pPPT_sm

0.06

288.8

19.6

pTave07

-0.11

PPT06

0.07

pPPT08

0.06

300.1

20.3

pTmax07

-0.11

PPT06

0.07

pPPT08

0.06

305.4

20.6

  1. Best-fit models are presented based on the full climate data period (1902–2009), an early period (1902–1955), and a late period (1956–2009). The presented null models consider constant tree-ring indices
  2. p1-p3 climate predictors 1 to 3, c1-c3 coefficients of fixed effects, ΔAIC c corrected AIC value (AICc) of the null model minus the AICc of the tested model, R 2 marginal explained variance. Climate predictors are abbreviated as in Additional file 1: Table S1. The most frequent climate predictor for each period is indicated in bold