Predictor Importance Values for silver maple (Acer saccharinum)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	19.57	26
Mean May-September precipitation (mm)	20.55	24
Mean annual temperature (°C)	20.68	23
Mean May-September temperature (°C)	19.3	27
Mean temperature of coldest month (°C)	20.76	21
Mean temperature of warmest month (°C)	22.6	14
Annual aridity index	25.4	1
Minimum elevation	22.98	9
Maximum elevation	13.83	40
Average elevation	23.6	8
Median elevation	22.1	18
Range of elevation	22.82	10
Elevation coefficient ofvariation	24.68	5
Elevation standard deviation	25.23	2
Annual daylength coefficient of variation	24.8	3
Total available water capacity (cm, to 150 cm)	16.64	34
Total available water supply (cm, to 150 cm)	17.76	30
Depth to water table (cm)	21.36	20
Soil permeability rate (cm/hr)	22.49	15
Soil calcium carbonate (% by weight)	17.16	33
Soil cation-exchange capacity	19.96	25
Soil pH	22.73	11
Soil bulk density (g/cm3)	20.76	22
Organic matter content (% by weight)	22.68	12
Potential soil productivity	19.2	29
Soil erodibility factor, rock fragment free	22.22	16
Soil erosion by wind (tons/acre/year)	22.21	17
Percent soil passing sieve No. 10 (coarse)	24.11	6
Percent soil passing sieve No. 200 (fine)	19.22	28
Percent clay (< 0.002 mm size)	24.03	7
Percent sand (< 0.002 mm size)	17.64	31
Percent silt (< 0.002 mm size)	21.4	19
Percent of texture clayey	17.56	32
Percent of texture loamy	15.11	37
Percent of texture sandy	15.43	36
Percent of texture other	12.15	41
Alfisol (%)	15.66	35
Aridisol (%)	0	45
Entisol (%)	4.05	44
Histosol (%)	14.61	38
Inceptisol (%)	24.72	4
Mollisol (%)	22.66	13
Spodosol (%)	11.71	42
Ultisol (%)	14.25	39
Vertisol (%)	11.04	43