Predictor Importance Values for quaking aspen (Populus tremuloides)

Predictor Name Importance Score Rank
Annual precipitation (mm)19.6232
Mean May-September precipitation (mm)22.119
Mean annual temperature (°C)20.7527
Mean May-September temperature (°C)19.7530
Mean temperature of coldest month (°C)23.2414
Mean temperature of warmest month (°C)21.6521
Annual aridity index20.428
Minimum elevation14.8238
Maximum elevation21.3323
Average elevation18.5834
Median elevation9.4543
Range of elevation17.9236
Elevation coefficient ofvariation19.6931
Elevation standard deviation19.5133
Annual daylength coefficient of variation24.5613
Total available water capacity (cm, to 150 cm)21.622
Total available water supply (cm, to 150 cm)2510
Depth to water table (cm)27.475
Soil permeability rate (cm/hr)22.6916
Soil calcium carbonate (% by weight)22.4517
Soil cation-exchange capacity25.139
Soil pH24.6312
Soil bulk density (g/cm3)29.272
Organic matter content (% by weight)21.0625
Potential soil productivity22.8915
Soil erodibility factor, rock fragment free26.156
Soil erosion by wind (tons/acre/year)25.548
Percent soil passing sieve No. 10 (coarse)28.323
Percent soil passing sieve No. 200 (fine)21.1224
Percent clay (< 0.002 mm size)24.811
Percent sand (< 0.002 mm size)22.0620
Percent silt (< 0.002 mm size)26.157
Percent of texture clayey13.5439
Percent of texture loamy13.3840
Percent of texture sandy28.074
Percent of texture other17.0537
Alfisol (%)33.771
Aridisol (%)1.0545
Entisol (%)10.742
Histosol (%)20.9826
Inceptisol (%)22.1818
Mollisol (%)20.129
Spodosol (%)18.5435
Ultisol (%)11.4941
Vertisol (%)5.3944