Predictor Importance Values for sweet birch (Betula lenta)

Predictor Name Importance Score Rank
Annual precipitation (mm)14.9729
Mean May-September precipitation (mm)21.437
Mean annual temperature (°C)15.6127
Mean May-September temperature (°C)16.1425
Mean temperature of coldest month (°C)19.2716
Mean temperature of warmest month (°C)13.9632
Annual aridity index14.7730
Minimum elevation22.681
Maximum elevation19.2915
Average elevation13.8334
Median elevation14.0731
Range of elevation22.632
Elevation coefficient ofvariation17.8920
Elevation standard deviation17.4721
Annual daylength coefficient of variation21.865
Total available water capacity (cm, to 150 cm)16.5124
Total available water supply (cm, to 150 cm)17.4122
Depth to water table (cm)17.2123
Soil permeability rate (cm/hr)19.8613
Soil calcium carbonate (% by weight)10.0143
Soil cation-exchange capacity20.699
Soil pH12.238
Soil bulk density (g/cm3)13.933
Organic matter content (% by weight)20.1512
Potential soil productivity20.2311
Soil erodibility factor, rock fragment free20.5410
Soil erosion by wind (tons/acre/year)19.7414
Percent soil passing sieve No. 10 (coarse)22.054
Percent soil passing sieve No. 200 (fine)21.526
Percent clay (< 0.002 mm size)18.3418
Percent sand (< 0.002 mm size)22.363
Percent silt (< 0.002 mm size)20.868
Percent of texture clayey10.4842
Percent of texture loamy13.2135
Percent of texture sandy18.1219
Percent of texture other13.0136
Alfisol (%)18.5617
Aridisol (%)1.245
Entisol (%)12.7137
Histosol (%)15.7526
Inceptisol (%)15.5328
Mollisol (%)11.939
Spodosol (%)10.641
Ultisol (%)11.4440
Vertisol (%)2.8344