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Table 4 Variable importance in the projections (VIP) score for beech

From: Variables related to nitrogen deposition improve defoliation models for European forests

Predictor

Models

Reference

Reference + BADoAP

Reference + Nthrdep

Reference + BADoAP + Nthrdep

Reference + foliar

Reference + Soil

Latitude

0.20

0.81

0.12

0.14 (−)

1.15

0.00

Longitude

0.28 (−)

0.26 (−)

0.16 (−)

0.67 (−)

0.34

0.20 (−)

Altitude

0.34 (−)

0.78 (−)

0.19 (−)

0.20 (−)

0.97 (−)

0.05

Tree density

1.53 (−)

1.16 (−)

0.85 (−)

1.23 (−)

0.54 (−)

0.19 (−)

Pr

1.69

0.88

0.94

0.69

0.56

0.93

Summer Pr

0.75 (−)

0.78

0.42 (−)

0.58

0.95 (−)

0.45 (−)

BADoAP

 

1.72

 

1.55

  

Nthrdep

  

2.27

1.65

  

Foliar N/P

    

0.27

 

Foliar N/Ca

    

1.74

 

Foliar N/Mg

    

0.95

 

Foliar N/K

    

1.44

 

Soil pH (CaCl2)

     

1.69 (−)

Soil C/N

     

1.85

Soil BCE

     

1.23 (−)

  1. VIP > 1 are in italics
  2. (−) negative regression coefficient, Pr precipitation, BADoAP biotic or abiotic damage for known causes other than air pollution, Nthr dep nitrogen throughfall deposition
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Annals of Forest Science

ISSN: 1297-966X