Predictor Importance Values for mountain maple (Acer spicatum)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	12.42	9
Mean May-September precipitation (mm)	11.35	13
Mean annual temperature (°C)	10.47	24
Mean May-September temperature (°C)	12.17	10
Mean temperature of coldest month (°C)	11.04	19
Mean temperature of warmest month (°C)	14.04	3
Annual aridity index	9.7	29
Minimum elevation	9.69	30
Maximum elevation	9.81	28
Average elevation	7.89	38
Median elevation	10.61	23
Range of elevation	11.18	15
Elevation coefficient ofvariation	15.18	2
Elevation standard deviation	9.48	31
Annual daylength coefficient of variation	13.57	4
Total available water capacity (cm, to 150 cm)	10.89	21
Total available water supply (cm, to 150 cm)	12.53	7
Depth to water table (cm)	12.93	6
Soil permeability rate (cm/hr)	8.48	35
Soil calcium carbonate (% by weight)	10.91	20
Soil cation-exchange capacity	11.04	18
Soil pH	12.99	5
Soil bulk density (g/cm3)	11.67	12
Organic matter content (% by weight)	11.12	16
Potential soil productivity	15.51	1
Soil erodibility factor, rock fragment free	12.48	8
Soil erosion by wind (tons/acre/year)	9.86	27
Percent soil passing sieve No. 10 (coarse)	11.78	11
Percent soil passing sieve No. 200 (fine)	7.74	39
Percent clay (< 0.002 mm size)	8.49	34
Percent sand (< 0.002 mm size)	7.17	40
Percent silt (< 0.002 mm size)	8.74	33
Percent of texture clayey	9.94	26
Percent of texture loamy	9.12	32
Percent of texture sandy	10.16	25
Percent of texture other	7.95	37
Alfisol (%)	11.21	14
Aridisol (%)	1	45
Entisol (%)	11.1	17
Histosol (%)	4	44
Inceptisol (%)	10.72	22
Mollisol (%)	8.14	36
Spodosol (%)	6.72	41
Ultisol (%)	4.06	43
Vertisol (%)	5.14	42