Predictor Importance Values for river birch (Betula nigra)

Predictor Name Importance Score Rank
Annual precipitation (mm)10.425
Mean May-September precipitation (mm)14.5912
Mean annual temperature (°C)8.4935
Mean May-September temperature (°C)7.9939
Mean temperature of coldest month (°C)8.1637
Mean temperature of warmest month (°C)7.1642
Annual aridity index14.9411
Minimum elevation11.0521
Maximum elevation10.5823
Average elevation7.4841
Median elevation9.1630
Range of elevation4.1644
Elevation coefficient ofvariation15.1810
Elevation standard deviation8.3836
Annual daylength coefficient of variation1218
Total available water capacity (cm, to 150 cm)15.369
Total available water supply (cm, to 150 cm)13.1816
Depth to water table (cm)19.191
Soil permeability rate (cm/hr)16.736
Soil calcium carbonate (% by weight)11.0422
Soil cation-exchange capacity10.3526
Soil pH17.794
Soil bulk density (g/cm3)14.4514
Organic matter content (% by weight)14.3915
Potential soil productivity8.9731
Soil erodibility factor, rock fragment free15.488
Soil erosion by wind (tons/acre/year)8.8633
Percent soil passing sieve No. 10 (coarse)8.138
Percent soil passing sieve No. 200 (fine)14.5213
Percent clay (< 0.002 mm size)16.815
Percent sand (< 0.002 mm size)17.943
Percent silt (< 0.002 mm size)8.9332
Percent of texture clayey11.7819
Percent of texture loamy10.1927
Percent of texture sandy7.9540
Percent of texture other11.1120
Alfisol (%)10.5524
Aridisol (%)045
Entisol (%)12.2517
Histosol (%)1028
Inceptisol (%)18.912
Mollisol (%)15.777
Spodosol (%)6.0143
Ultisol (%)8.534
Vertisol (%)9.4129