Predictor Importance Values for balsam fir (Abies balsamea)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	17.23	33
Mean May-September precipitation (mm)	15.54	37
Mean annual temperature (°C)	20.67	12
Mean May-September temperature (°C)	26.77	1
Mean temperature of coldest month (°C)	15.98	36
Mean temperature of warmest month (°C)	22.81	5
Annual aridity index	16.92	34
Minimum elevation	21.72	9
Maximum elevation	17.6	31
Average elevation	21.11	11
Median elevation	22.22	6
Range of elevation	19.88	18
Elevation coefficient ofvariation	18.33	24
Elevation standard deviation	20.27	15
Annual daylength coefficient of variation	19.24	21
Total available water capacity (cm, to 150 cm)	14.06	40
Total available water supply (cm, to 150 cm)	23.45	4
Depth to water table (cm)	22.11	8
Soil permeability rate (cm/hr)	18.72	23
Soil calcium carbonate (% by weight)	19.36	19
Soil cation-exchange capacity	18.27	25
Soil pH	18.13	27
Soil bulk density (g/cm3)	20.33	13
Organic matter content (% by weight)	14.44	39
Potential soil productivity	24.39	3
Soil erodibility factor, rock fragment free	20.08	16
Soil erosion by wind (tons/acre/year)	18.01	28
Percent soil passing sieve No. 10 (coarse)	21.23	10
Percent soil passing sieve No. 200 (fine)	18.97	22
Percent clay (< 0.002 mm size)	17.96	29
Percent sand (< 0.002 mm size)	22.13	7
Percent silt (< 0.002 mm size)	15.43	38
Percent of texture clayey	11.48	41
Percent of texture loamy	17.67	30
Percent of texture sandy	19.99	17
Percent of texture other	20.3	14
Alfisol (%)	18.23	26
Aridisol (%)	0.85	45
Entisol (%)	6.14	43
Histosol (%)	16.3	35
Inceptisol (%)	26.35	2
Mollisol (%)	17.28	32
Spodosol (%)	19.36	20
Ultisol (%)	7.56	42
Vertisol (%)	5.67	44