Predictor Importance Values for American holly (Ilex opaca)

Predictor Name Importance Score Rank
Annual precipitation (mm)16.7615
Mean May-September precipitation (mm)1427
Mean annual temperature (°C)9.138
Mean May-September temperature (°C)10.0937
Mean temperature of coldest month (°C)8.7540
Mean temperature of warmest month (°C)11.9134
Annual aridity index21.672
Minimum elevation18.517
Maximum elevation18.816
Average elevation17.9712
Median elevation1525
Range of elevation13.0132
Elevation coefficient ofvariation16.7316
Elevation standard deviation13.4929
Annual daylength coefficient of variation11.2635
Total available water capacity (cm, to 150 cm)13.231
Total available water supply (cm, to 150 cm)12.3833
Depth to water table (cm)16.1820
Soil permeability rate (cm/hr)17.3613
Soil calcium carbonate (% by weight)15.3824
Soil cation-exchange capacity18.159
Soil pH22.091
Soil bulk density (g/cm3)19.624
Organic matter content (% by weight)8.9739
Potential soil productivity18.1110
Soil erodibility factor, rock fragment free19.863
Soil erosion by wind (tons/acre/year)13.4530
Percent soil passing sieve No. 10 (coarse)18.915
Percent soil passing sieve No. 200 (fine)15.4123
Percent clay (< 0.002 mm size)17.9911
Percent sand (< 0.002 mm size)15.9821
Percent silt (< 0.002 mm size)16.4218
Percent of texture clayey16.9414
Percent of texture loamy8.0441
Percent of texture sandy13.7328
Percent of texture other16.5517
Alfisol (%)16.219
Aridisol (%)1.3345
Entisol (%)7.5342
Histosol (%)6.1743
Inceptisol (%)14.7326
Mollisol (%)5.444
Spodosol (%)11.0336
Ultisol (%)18.368
Vertisol (%)15.6322