Predictor Importance Values for sassafras (Sassafras albidum)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	20.6	8
Mean May-September precipitation (mm)	16.8	20
Mean annual temperature (°C)	11.93	31
Mean May-September temperature (°C)	6.32	43
Mean temperature of coldest month (°C)	16.65	21
Mean temperature of warmest month (°C)	14.25	25
Annual aridity index	21.86	6
Minimum elevation	17.88	16
Maximum elevation	15.99	22
Average elevation	8.27	39
Median elevation	17.67	17
Range of elevation	15.86	23
Elevation coefficient ofvariation	22.45	4
Elevation standard deviation	13.27	28
Annual daylength coefficient of variation	10.51	33
Total available water capacity (cm, to 150 cm)	25.22	2
Total available water supply (cm, to 150 cm)	17.61	18
Depth to water table (cm)	29.3	1
Soil permeability rate (cm/hr)	19.81	13
Soil calcium carbonate (% by weight)	17.91	14
Soil cation-exchange capacity	20.12	10
Soil pH	20.19	9
Soil bulk density (g/cm3)	23.09	3
Organic matter content (% by weight)	8.65	38
Potential soil productivity	17.9	15
Soil erodibility factor, rock fragment free	8.82	37
Soil erosion by wind (tons/acre/year)	21.9	5
Percent soil passing sieve No. 10 (coarse)	20.05	12
Percent soil passing sieve No. 200 (fine)	4.18	44
Percent clay (< 0.002 mm size)	10.18	34
Percent sand (< 0.002 mm size)	6.33	42
Percent silt (< 0.002 mm size)	9.32	36
Percent of texture clayey	10.85	32
Percent of texture loamy	14.01	27
Percent of texture sandy	12.81	29
Percent of texture other	7.25	41
Alfisol (%)	12.27	30
Aridisol (%)	0	45
Entisol (%)	14.07	26
Histosol (%)	7.92	40
Inceptisol (%)	20.08	11
Mollisol (%)	21.84	7
Spodosol (%)	14.48	24
Ultisol (%)	16.93	19
Vertisol (%)	9.52	35