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Table 6 Interaction size for the variables included in the boosted regression trees for the data as a whole. Large values of the interaction size indicate strong interactions. SM3 Interaction size for the variables included in the boosted regression trees for the data as a whole. Large values of the interaction size indicate strong interactions.

From: Shrub richness is primarily driven by climate conditions in Southwestern European woodlands

Interaction

Interaction size

Var_Rainfall x Temperature

11.16

Var_Rainfall x Rainfall

7.28

Sand x Rainfall

3.84

Var_Rainfall x Altitude

3.34

Sand x Var_Rainfall

3.05

Sand x Temperature

2.78

Nitrogen x Altitude

1.59

Silt x Rainfall

1.57

Temperature x Rainfall

1.52

CEC x Rainfall

1.34

Var_Rainfall x Slope

1.16

Var_Rainfall x pH

1.14

Silt x Var_Rainfall

1.01

Var_Temp x Temperature

0.98

Sand x Altitude

0.88

Bulk x Var_Rainfall

0.85

Nitrogen x DBH

0.84

Nitrogen x BA

0.76

  1. Rainfall = mean cumulative rainfall; Temp = mean annual temperature; Var_temp and Var_Rainfall = temperature and rainfall variability as the ratio of the standard deviation of monthly values and the mean, respectively; DBH = mean plot dbh; N =number of trees per ha; CEC = cation exchange capacity at ph 7