Predictor Importance Values for northern pin oak (Quercus ellipsoidalis)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	13.52	18
Mean May-September precipitation (mm)	22.34	2
Mean annual temperature (°C)	9.64	33
Mean May-September temperature (°C)	10.9	28
Mean temperature of coldest month (°C)	13.21	19
Mean temperature of warmest month (°C)	11.06	27
Annual aridity index	22.48	1
Minimum elevation	10.45	31
Maximum elevation	8.28	38
Average elevation	9.23	36
Median elevation	11.52	25
Range of elevation	12.39	22
Elevation coefficient ofvariation	9.56	35
Elevation standard deviation	11.82	24
Annual daylength coefficient of variation	10.33	32
Total available water capacity (cm, to 150 cm)	12.42	21
Total available water supply (cm, to 150 cm)	14.86	11
Depth to water table (cm)	18.41	4
Soil permeability rate (cm/hr)	14.9	10
Soil calcium carbonate (% by weight)	14.18	14
Soil cation-exchange capacity	14.82	12
Soil pH	7.04	41
Soil bulk density (g/cm3)	11.97	23
Organic matter content (% by weight)	9.59	34
Potential soil productivity	12.7	20
Soil erodibility factor, rock fragment free	13.8	16
Soil erosion by wind (tons/acre/year)	17.84	5
Percent soil passing sieve No. 10 (coarse)	17.64	7
Percent soil passing sieve No. 200 (fine)	17.01	8
Percent clay (< 0.002 mm size)	13.87	15
Percent sand (< 0.002 mm size)	14.45	13
Percent silt (< 0.002 mm size)	20.8	3
Percent of texture clayey	11.26	26
Percent of texture loamy	10.49	30
Percent of texture sandy	10.66	29
Percent of texture other	7.7	40
Alfisol (%)	16.98	9
Aridisol (%)	-1	44
Entisol (%)	4.81	42
Histosol (%)	8.28	39
Inceptisol (%)	17.66	6
Mollisol (%)	13.6	17
Spodosol (%)	8.32	37
Ultisol (%)	4.06	43
Vertisol (%)	-1.41	45