Predictor Importance Values for white oak (Quercus alba)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	38.32	9
Mean May-September precipitation (mm)	41.83	6
Mean annual temperature (°C)	28.52	35
Mean May-September temperature (°C)	36.6	12
Mean temperature of coldest month (°C)	35.2	15
Mean temperature of warmest month (°C)	30.74	24
Annual aridity index	43.22	2
Minimum elevation	36.36	14
Maximum elevation	29.55	31
Average elevation	23.93	39
Median elevation	33.4	19
Range of elevation	28.07	37
Elevation coefficient ofvariation	34.95	16
Elevation standard deviation	29.85	28
Annual daylength coefficient of variation	31.65	21
Total available water capacity (cm, to 150 cm)	40.85	8
Total available water supply (cm, to 150 cm)	34.04	17
Depth to water table (cm)	43.55	1
Soil permeability rate (cm/hr)	42.91	3
Soil calcium carbonate (% by weight)	21.47	40
Soil cation-exchange capacity	42.59	5
Soil pH	37.62	11
Soil bulk density (g/cm3)	42.81	4
Organic matter content (% by weight)	28.37	36
Potential soil productivity	30.61	25
Soil erodibility factor, rock fragment free	40.9	7
Soil erosion by wind (tons/acre/year)	30.17	26
Percent soil passing sieve No. 10 (coarse)	37.79	10
Percent soil passing sieve No. 200 (fine)	31.11	23
Percent clay (< 0.002 mm size)	29.78	29
Percent sand (< 0.002 mm size)	29.72	30
Percent silt (< 0.002 mm size)	36.55	13
Percent of texture clayey	28.87	33
Percent of texture loamy	30	27
Percent of texture sandy	29.41	32
Percent of texture other	34.03	18
Alfisol (%)	33.35	20
Aridisol (%)	1.18	45
Entisol (%)	11.59	44
Histosol (%)	15.27	41
Inceptisol (%)	31.64	22
Mollisol (%)	28.85	34
Spodosol (%)	12.56	43
Ultisol (%)	27.38	38
Vertisol (%)	12.61	42