Predictor Importance Values for balsam poplar (Populus balsamifera)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	13.69	18
Mean May-September precipitation (mm)	13.49	20
Mean annual temperature (°C)	16.4	9
Mean May-September temperature (°C)	15	12
Mean temperature of coldest month (°C)	17.32	5
Mean temperature of warmest month (°C)	17.6	4
Annual aridity index	15.1	11
Minimum elevation	12.78	26
Maximum elevation	14.87	13
Average elevation	11.75	29
Median elevation	14.24	16
Range of elevation	6.76	41
Elevation coefficient ofvariation	7.67	39
Elevation standard deviation	7.86	38
Annual daylength coefficient of variation	18.18	2
Total available water capacity (cm, to 150 cm)	11.2	32
Total available water supply (cm, to 150 cm)	10.77	33
Depth to water table (cm)	10.47	34
Soil permeability rate (cm/hr)	14.63	14
Soil calcium carbonate (% by weight)	16.06	10
Soil cation-exchange capacity	8.57	37
Soil pH	18.52	1
Soil bulk density (g/cm3)	12.15	28
Organic matter content (% by weight)	11.5	30
Potential soil productivity	12.88	25
Soil erodibility factor, rock fragment free	13.13	24
Soil erosion by wind (tons/acre/year)	13.19	23
Percent soil passing sieve No. 10 (coarse)	13.49	21
Percent soil passing sieve No. 200 (fine)	16.94	6
Percent clay (< 0.002 mm size)	16.77	7
Percent sand (< 0.002 mm size)	16.75	8
Percent silt (< 0.002 mm size)	18.16	3
Percent of texture clayey	9.58	36
Percent of texture loamy	7.19	40
Percent of texture sandy	14.59	15
Percent of texture other	13.48	22
Alfisol (%)	14.01	17
Aridisol (%)	-1	45
Entisol (%)	5.18	42
Histosol (%)	11.47	31
Inceptisol (%)	13.53	19
Mollisol (%)	12.4	27
Spodosol (%)	10.05	35
Ultisol (%)	1.48	44
Vertisol (%)	5.12	43