Predictor Importance Values for black ash (Fraxinus nigra)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	17.62	20
Mean May-September precipitation (mm)	18.36	19
Mean annual temperature (°C)	13.98	36
Mean May-September temperature (°C)	15.4	31
Mean temperature of coldest month (°C)	18.59	15
Mean temperature of warmest month (°C)	16.8	24
Annual aridity index	16.21	27
Minimum elevation	8.23	43
Maximum elevation	15.32	32
Average elevation	13.55	37
Median elevation	16.34	25
Range of elevation	12.31	39
Elevation coefficient ofvariation	16.26	26
Elevation standard deviation	15.93	29
Annual daylength coefficient of variation	20.89	4
Total available water capacity (cm, to 150 cm)	14.89	35
Total available water supply (cm, to 150 cm)	20.03	8
Depth to water table (cm)	17.48	21
Soil permeability rate (cm/hr)	18.78	14
Soil calcium carbonate (% by weight)	16.01	28
Soil cation-exchange capacity	15.3	33
Soil pH	16.99	23
Soil bulk density (g/cm3)	20.68	6
Organic matter content (% by weight)	18.55	17
Potential soil productivity	20.19	7
Soil erodibility factor, rock fragment free	21.72	3
Soil erosion by wind (tons/acre/year)	18.57	16
Percent soil passing sieve No. 10 (coarse)	19.67	11
Percent soil passing sieve No. 200 (fine)	19.7	10
Percent clay (< 0.002 mm size)	17.11	22
Percent sand (< 0.002 mm size)	19.54	12
Percent silt (< 0.002 mm size)	20.86	5
Percent of texture clayey	19.71	9
Percent of texture loamy	22.9	1
Percent of texture sandy	18.44	18
Percent of texture other	12.85	38
Alfisol (%)	21.89	2
Aridisol (%)	0	45
Entisol (%)	10.44	42
Histosol (%)	15.55	30
Inceptisol (%)	14.9	34
Mollisol (%)	19.11	13
Spodosol (%)	10.9	41
Ultisol (%)	11.95	40
Vertisol (%)	5.17	44