Predictor Importance Values for Shumard oak (Quercus shumardii)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	14.67	13
Mean May-September precipitation (mm)	17.4	6
Mean annual temperature (°C)	13.38	25
Mean May-September temperature (°C)	9.66	40
Mean temperature of coldest month (°C)	12.92	26
Mean temperature of warmest month (°C)	9.83	38
Annual aridity index	13.95	18
Minimum elevation	6.85	43
Maximum elevation	8.83	41
Average elevation	9.97	36
Median elevation	10.41	34
Range of elevation	11.81	29
Elevation coefficient ofvariation	13.46	23
Elevation standard deviation	12.48	28
Annual daylength coefficient of variation	13.64	22
Total available water capacity (cm, to 150 cm)	22.32	1
Total available water supply (cm, to 150 cm)	21.98	2
Depth to water table (cm)	18.06	5
Soil permeability rate (cm/hr)	16.67	8
Soil calcium carbonate (% by weight)	16.29	9
Soil cation-exchange capacity	18.35	4
Soil pH	13.9	20
Soil bulk density (g/cm3)	15.8	10
Organic matter content (% by weight)	14.54	14
Potential soil productivity	16.68	7
Soil erodibility factor, rock fragment free	14.02	17
Soil erosion by wind (tons/acre/year)	18.5	3
Percent soil passing sieve No. 10 (coarse)	15.77	11
Percent soil passing sieve No. 200 (fine)	10.41	35
Percent clay (< 0.002 mm size)	13.69	21
Percent sand (< 0.002 mm size)	10.72	33
Percent silt (< 0.002 mm size)	14.31	15
Percent of texture clayey	11.79	30
Percent of texture loamy	14.82	12
Percent of texture sandy	13.9	19
Percent of texture other	13.41	24
Alfisol (%)	9.7	39
Aridisol (%)	-0	45
Entisol (%)	9.83	37
Histosol (%)	4.21	44
Inceptisol (%)	11.61	31
Mollisol (%)	14.29	16
Spodosol (%)	7.07	42
Ultisol (%)	12.79	27
Vertisol (%)	11.45	32