Predictor Importance Values for black willow (Salix nigra)

Predictor Name Importance Score Rank
Annual precipitation (mm)14.8133
Mean May-September precipitation (mm)16.0929
Mean annual temperature (°C)17.924
Mean May-September temperature (°C)13.5837
Mean temperature of coldest month (°C)16.3828
Mean temperature of warmest month (°C)19.7912
Annual aridity index14.235
Minimum elevation8.243
Maximum elevation11.9440
Average elevation14.2934
Median elevation18.0123
Range of elevation8.2142
Elevation coefficient ofvariation18.2521
Elevation standard deviation7.9244
Annual daylength coefficient of variation18.7318
Total available water capacity (cm, to 150 cm)19.9811
Total available water supply (cm, to 150 cm)18.6120
Depth to water table (cm)22.074
Soil permeability rate (cm/hr)19.0216
Soil calcium carbonate (% by weight)19.1914
Soil cation-exchange capacity18.1622
Soil pH17.7625
Soil bulk density (g/cm3)23.452
Organic matter content (% by weight)21.147
Potential soil productivity20.519
Soil erodibility factor, rock fragment free21.048
Soil erosion by wind (tons/acre/year)18.7319
Percent soil passing sieve No. 10 (coarse)21.985
Percent soil passing sieve No. 200 (fine)21.326
Percent clay (< 0.002 mm size)15.532
Percent sand (< 0.002 mm size)12.8938
Percent silt (< 0.002 mm size)15.8230
Percent of texture clayey15.6131
Percent of texture loamy19.6413
Percent of texture sandy18.9417
Percent of texture other20.510
Alfisol (%)23.153
Aridisol (%)1.645
Entisol (%)19.0715
Histosol (%)14.0536
Inceptisol (%)28.111
Mollisol (%)17.626
Spodosol (%)11.2941
Ultisol (%)16.5427
Vertisol (%)12.6139