Predictor Importance Values for white ash (Fraxinus americana)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	26.64	14
Mean May-September precipitation (mm)	21.73	30
Mean annual temperature (°C)	17.74	41
Mean May-September temperature (°C)	25.66	20
Mean temperature of coldest month (°C)	24.58	24
Mean temperature of warmest month (°C)	20.5	34
Annual aridity index	14.26	42
Minimum elevation	17.8	40
Maximum elevation	21.63	31
Average elevation	19.99	35
Median elevation	23.6	27
Range of elevation	26.67	13
Elevation coefficient ofvariation	26.01	18
Elevation standard deviation	28.45	7
Annual daylength coefficient of variation	28.62	6
Total available water capacity (cm, to 150 cm)	23.95	26
Total available water supply (cm, to 150 cm)	23.09	28
Depth to water table (cm)	32.48	2
Soil permeability rate (cm/hr)	29.27	5
Soil calcium carbonate (% by weight)	25.1	21
Soil cation-exchange capacity	31.36	3
Soil pH	35.24	1
Soil bulk density (g/cm3)	26.41	16
Organic matter content (% by weight)	28	12
Potential soil productivity	28.21	11
Soil erodibility factor, rock fragment free	29.53	4
Soil erosion by wind (tons/acre/year)	28.29	10
Percent soil passing sieve No. 10 (coarse)	25.82	19
Percent soil passing sieve No. 200 (fine)	26.47	15
Percent clay (< 0.002 mm size)	28.35	9
Percent sand (< 0.002 mm size)	24.94	23
Percent silt (< 0.002 mm size)	20.76	33
Percent of texture clayey	22.85	29
Percent of texture loamy	21.12	32
Percent of texture sandy	28.45	8
Percent of texture other	24.23	25
Alfisol (%)	25.1	22
Aridisol (%)	1.12	45
Entisol (%)	13.49	43
Histosol (%)	19.01	38
Inceptisol (%)	19.3	37
Mollisol (%)	26.26	17
Spodosol (%)	19.89	36
Ultisol (%)	17.89	39
Vertisol (%)	9.26	44