Predictor Importance Values for pignut hickory (Carya glabra)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	22.23	29
Mean May-September precipitation (mm)	25.95	10
Mean annual temperature (°C)	22.47	26
Mean May-September temperature (°C)	25.27	17
Mean temperature of coldest month (°C)	31.56	4
Mean temperature of warmest month (°C)	25.22	18
Annual aridity index	24.06	23
Minimum elevation	20.22	34
Maximum elevation	22.35	28
Average elevation	21.61	31
Median elevation	24.75	21
Range of elevation	19.46	36
Elevation coefficient ofvariation	20.34	33
Elevation standard deviation	25.44	15
Annual daylength coefficient of variation	26.6	9
Total available water capacity (cm, to 150 cm)	25.47	14
Total available water supply (cm, to 150 cm)	25.16	19
Depth to water table (cm)	19.21	38
Soil permeability rate (cm/hr)	35.91	1
Soil calcium carbonate (% by weight)	19.08	39
Soil cation-exchange capacity	34.15	2
Soil pH	21.29	32
Soil bulk density (g/cm3)	31.6	3
Organic matter content (% by weight)	22.43	27
Potential soil productivity	24.56	22
Soil erodibility factor, rock fragment free	19.41	37
Soil erosion by wind (tons/acre/year)	25.77	11
Percent soil passing sieve No. 10 (coarse)	25.44	16
Percent soil passing sieve No. 200 (fine)	25.5	13
Percent clay (< 0.002 mm size)	30.23	5
Percent sand (< 0.002 mm size)	21.84	30
Percent silt (< 0.002 mm size)	29.77	6
Percent of texture clayey	25.08	20
Percent of texture loamy	23.58	24
Percent of texture sandy	20.16	35
Percent of texture other	25.58	12
Alfisol (%)	29.15	8
Aridisol (%)	0.36	45
Entisol (%)	12.38	43
Histosol (%)	15.01	41
Inceptisol (%)	29.38	7
Mollisol (%)	22.75	25
Spodosol (%)	12.37	44
Ultisol (%)	17.34	40
Vertisol (%)	13.76	42