Predictor Importance Values for bitternut hickory (Carya cordiformis)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	23.03	7
Mean May-September precipitation (mm)	16.81	23
Mean annual temperature (°C)	15.29	27
Mean May-September temperature (°C)	17.2	22
Mean temperature of coldest month (°C)	18.63	19
Mean temperature of warmest month (°C)	16.38	25
Annual aridity index	24.6	4
Minimum elevation	6.78	44
Maximum elevation	8.53	40
Average elevation	13.08	34
Median elevation	11.39	38
Range of elevation	12.55	36
Elevation coefficient ofvariation	16.55	24
Elevation standard deviation	13.82	32
Annual daylength coefficient of variation	20.62	13
Total available water capacity (cm, to 150 cm)	19.84	16
Total available water supply (cm, to 150 cm)	15.2	29
Depth to water table (cm)	25.17	3
Soil permeability rate (cm/hr)	21.34	11
Soil calcium carbonate (% by weight)	21.98	8
Soil cation-exchange capacity	23.16	6
Soil pH	18.28	20
Soil bulk density (g/cm3)	27.54	2
Organic matter content (% by weight)	15.23	28
Potential soil productivity	18.71	18
Soil erodibility factor, rock fragment free	30.19	1
Soil erosion by wind (tons/acre/year)	18.77	17
Percent soil passing sieve No. 10 (coarse)	19.92	15
Percent soil passing sieve No. 200 (fine)	15.98	26
Percent clay (< 0.002 mm size)	19.94	14
Percent sand (< 0.002 mm size)	17.62	21
Percent silt (< 0.002 mm size)	21.51	10
Percent of texture clayey	8.38	41
Percent of texture loamy	14.69	31
Percent of texture sandy	12.03	37
Percent of texture other	14.93	30
Alfisol (%)	21.18	12
Aridisol (%)	-1	45
Entisol (%)	8.33	42
Histosol (%)	12.73	35
Inceptisol (%)	23.98	5
Mollisol (%)	21.54	9
Spodosol (%)	13.21	33
Ultisol (%)	11.01	39
Vertisol (%)	7.42	43