Predictor Importance Values for red pine (Pinus resinosa)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	20.9	9
Mean May-September precipitation (mm)	22.96	4
Mean annual temperature (°C)	17.53	25
Mean May-September temperature (°C)	19.94	16
Mean temperature of coldest month (°C)	17.47	27
Mean temperature of warmest month (°C)	17.94	22
Annual aridity index	18.11	21
Minimum elevation	16.48	31
Maximum elevation	17.01	29
Average elevation	17.51	26
Median elevation	16.25	33
Range of elevation	13.42	37
Elevation coefficient ofvariation	16.8	30
Elevation standard deviation	19.17	19
Annual daylength coefficient of variation	20.09	15
Total available water capacity (cm, to 150 cm)	17.65	24
Total available water supply (cm, to 150 cm)	21.72	8
Depth to water table (cm)	27.02	2
Soil permeability rate (cm/hr)	9.58	40
Soil calcium carbonate (% by weight)	17.2	28
Soil cation-exchange capacity	20.47	12
Soil pH	20.22	14
Soil bulk density (g/cm3)	22.64	5
Organic matter content (% by weight)	19.54	17
Potential soil productivity	20.79	10
Soil erodibility factor, rock fragment free	18.36	20
Soil erosion by wind (tons/acre/year)	27.11	1
Percent soil passing sieve No. 10 (coarse)	22.06	6
Percent soil passing sieve No. 200 (fine)	13.83	36
Percent clay (< 0.002 mm size)	20.52	11
Percent sand (< 0.002 mm size)	20.44	13
Percent silt (< 0.002 mm size)	25.76	3
Percent of texture clayey	10.11	39
Percent of texture loamy	16.44	32
Percent of texture sandy	14.32	35
Percent of texture other	19.51	18
Alfisol (%)	21.79	7
Aridisol (%)	0	45
Entisol (%)	5.85	43
Histosol (%)	14.84	34
Inceptisol (%)	17.78	23
Mollisol (%)	13.24	38
Spodosol (%)	7.67	42
Ultisol (%)	9.16	41
Vertisol (%)	4.87	44