Predictor Importance Values for sugar maple (Acer saccharum)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	36.08	8
Mean May-September precipitation (mm)	39.38	2
Mean annual temperature (°C)	30.63	23
Mean May-September temperature (°C)	28.3	30
Mean temperature of coldest month (°C)	32.93	16
Mean temperature of warmest month (°C)	28.34	29
Annual aridity index	27.55	33
Minimum elevation	30.74	22
Maximum elevation	27.94	31
Average elevation	29.69	27
Median elevation	22.73	38
Range of elevation	28.49	28
Elevation coefficient ofvariation	27.64	32
Elevation standard deviation	32.47	18
Annual daylength coefficient of variation	31.52	21
Total available water capacity (cm, to 150 cm)	34.7	11
Total available water supply (cm, to 150 cm)	33.94	13
Depth to water table (cm)	36.15	7
Soil permeability rate (cm/hr)	38.76	3
Soil calcium carbonate (% by weight)	41.27	1
Soil cation-exchange capacity	38.53	4
Soil pH	29.98	26
Soil bulk density (g/cm3)	37.75	6
Organic matter content (% by weight)	30.08	25
Potential soil productivity	34.83	10
Soil erodibility factor, rock fragment free	36.01	9
Soil erosion by wind (tons/acre/year)	33.61	15
Percent soil passing sieve No. 10 (coarse)	26.58	34
Percent soil passing sieve No. 200 (fine)	32.83	17
Percent clay (< 0.002 mm size)	32.15	20
Percent sand (< 0.002 mm size)	25.15	35
Percent silt (< 0.002 mm size)	38.01	5
Percent of texture clayey	22.2	40
Percent of texture loamy	32.42	19
Percent of texture sandy	30.32	24
Percent of texture other	24.14	36
Alfisol (%)	33.77	14
Aridisol (%)	1.89	45
Entisol (%)	13.18	43
Histosol (%)	17.38	42
Inceptisol (%)	34.49	12
Mollisol (%)	23.2	37
Spodosol (%)	21.96	41
Ultisol (%)	22.47	39
Vertisol (%)	9.06	44