Predictor Importance Values for eastern white pine (Pinus strobus)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	21.88	29
Mean May-September precipitation (mm)	31.4	3
Mean annual temperature (°C)	21.94	28
Mean May-September temperature (°C)	22.19	26
Mean temperature of coldest month (°C)	18.82	35
Mean temperature of warmest month (°C)	28.67	8
Annual aridity index	28.78	7
Minimum elevation	28.94	6
Maximum elevation	21.71	30
Average elevation	26.11	18
Median elevation	25.98	19
Range of elevation	21.42	31
Elevation coefficient ofvariation	26.37	15
Elevation standard deviation	23.76	22
Annual daylength coefficient of variation	20.14	34
Total available water capacity (cm, to 150 cm)	26.69	14
Total available water supply (cm, to 150 cm)	26.35	16
Depth to water table (cm)	32.03	2
Soil permeability rate (cm/hr)	30.56	5
Soil calcium carbonate (% by weight)	22.18	27
Soil cation-exchange capacity	27.86	10
Soil pH	24.71	21
Soil bulk density (g/cm3)	26.97	13
Organic matter content (% by weight)	20.17	33
Potential soil productivity	34.51	1
Soil erodibility factor, rock fragment free	26.14	17
Soil erosion by wind (tons/acre/year)	27.56	11
Percent soil passing sieve No. 10 (coarse)	30.69	4
Percent soil passing sieve No. 200 (fine)	27.24	12
Percent clay (< 0.002 mm size)	23.19	24
Percent sand (< 0.002 mm size)	25.76	20
Percent silt (< 0.002 mm size)	28.6	9
Percent of texture clayey	18.66	36
Percent of texture loamy	18.28	37
Percent of texture sandy	20.29	32
Percent of texture other	17.81	38
Alfisol (%)	23.01	25
Aridisol (%)	1.36	45
Entisol (%)	10.1	43
Histosol (%)	15.63	40
Inceptisol (%)	23.54	23
Mollisol (%)	17.6	39
Spodosol (%)	12.32	42
Ultisol (%)	13.86	41
Vertisol (%)	3.66	44