Predictor Importance Values for mockernut hickory (Carya alba)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	24.54	18
Mean May-September precipitation (mm)	23.66	23
Mean annual temperature (°C)	20.08	30
Mean May-September temperature (°C)	20.61	29
Mean temperature of coldest month (°C)	18.48	33
Mean temperature of warmest month (°C)	24.07	20
Annual aridity index	26.02	13
Minimum elevation	16.39	37
Maximum elevation	8.2	42
Average elevation	6.12	44
Median elevation	6.67	43
Range of elevation	14.37	39
Elevation coefficient ofvariation	23.79	22
Elevation standard deviation	26.64	12
Annual daylength coefficient of variation	23.59	24
Total available water capacity (cm, to 150 cm)	25.21	14
Total available water supply (cm, to 150 cm)	24.74	17
Depth to water table (cm)	35.42	1
Soil permeability rate (cm/hr)	33.07	3
Soil calcium carbonate (% by weight)	20.9	28
Soil cation-exchange capacity	29.48	5
Soil pH	26.86	11
Soil bulk density (g/cm3)	34.88	2
Organic matter content (% by weight)	28.12	8
Potential soil productivity	19.31	31
Soil erodibility factor, rock fragment free	27.75	9
Soil erosion by wind (tons/acre/year)	17.33	35
Percent soil passing sieve No. 10 (coarse)	24.31	19
Percent soil passing sieve No. 200 (fine)	24.94	16
Percent clay (< 0.002 mm size)	18.53	32
Percent sand (< 0.002 mm size)	23.85	21
Percent silt (< 0.002 mm size)	28.32	7
Percent of texture clayey	22.23	26
Percent of texture loamy	21.88	27
Percent of texture sandy	17	36
Percent of texture other	28.39	6
Alfisol (%)	27.14	10
Aridisol (%)	1.31	45
Entisol (%)	13.56	40
Histosol (%)	13.14	41
Inceptisol (%)	31.4	4
Mollisol (%)	22.49	25
Spodosol (%)	15.48	38
Ultisol (%)	24.99	15
Vertisol (%)	18.12	34