Predictor Importance Values for black hickory (Carya texana)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	14.51	22
Mean May-September precipitation (mm)	17.05	14
Mean annual temperature (°C)	16.09	16
Mean May-September temperature (°C)	19.96	5
Mean temperature of coldest month (°C)	10.54	36
Mean temperature of warmest month (°C)	25.13	1
Annual aridity index	16.69	15
Minimum elevation	13.77	24
Maximum elevation	5.59	39
Average elevation	4.94	41
Median elevation	2.64	44
Range of elevation	15.94	17
Elevation coefficient ofvariation	12.17	31
Elevation standard deviation	13.23	26
Annual daylength coefficient of variation	12.08	33
Total available water capacity (cm, to 150 cm)	17.35	12
Total available water supply (cm, to 150 cm)	15.93	18
Depth to water table (cm)	14.65	21
Soil permeability rate (cm/hr)	12.94	28
Soil calcium carbonate (% by weight)	11.01	35
Soil cation-exchange capacity	13.17	27
Soil pH	17.33	13
Soil bulk density (g/cm3)	19.85	6
Organic matter content (% by weight)	20.07	4
Potential soil productivity	12.8	29
Soil erodibility factor, rock fragment free	18.27	11
Soil erosion by wind (tons/acre/year)	19.61	7
Percent soil passing sieve No. 10 (coarse)	19.12	9
Percent soil passing sieve No. 200 (fine)	18.89	10
Percent clay (< 0.002 mm size)	15.48	19
Percent sand (< 0.002 mm size)	14.66	20
Percent silt (< 0.002 mm size)	5.54	40
Percent of texture clayey	12.09	32
Percent of texture loamy	12.6	30
Percent of texture sandy	7.49	38
Percent of texture other	21.78	3
Alfisol (%)	19.49	8
Aridisol (%)	0.61	45
Entisol (%)	8.13	37
Histosol (%)	3.56	43
Inceptisol (%)	24.81	2
Mollisol (%)	14.13	23
Spodosol (%)	3.57	42
Ultisol (%)	13.23	25
Vertisol (%)	11.66	34