Predictor Importance Values for northern white-cedar (Thuja occidentalis)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	14.5	35
Mean May-September precipitation (mm)	15.88	27
Mean annual temperature (°C)	18.24	19
Mean May-September temperature (°C)	17.87	21
Mean temperature of coldest month (°C)	20.37	6
Mean temperature of warmest month (°C)	18.68	12
Annual aridity index	20.06	8
Minimum elevation	9.5	42
Maximum elevation	18.63	13
Average elevation	16.29	25
Median elevation	20.2	7
Range of elevation	15.8	28
Elevation coefficient ofvariation	17.07	23
Elevation standard deviation	21.87	2
Annual daylength coefficient of variation	23.35	1
Total available water capacity (cm, to 150 cm)	13.51	36
Total available water supply (cm, to 150 cm)	18.4	16
Depth to water table (cm)	20.92	5
Soil permeability rate (cm/hr)	18.46	15
Soil calcium carbonate (% by weight)	16.03	26
Soil cation-exchange capacity	10.23	41
Soil pH	18.63	14
Soil bulk density (g/cm3)	12.21	39
Organic matter content (% by weight)	15.07	32
Potential soil productivity	14.94	33
Soil erodibility factor, rock fragment free	20.03	9
Soil erosion by wind (tons/acre/year)	17.38	22
Percent soil passing sieve No. 10 (coarse)	21.23	3
Percent soil passing sieve No. 200 (fine)	15.35	30
Percent clay (< 0.002 mm size)	12.63	38
Percent sand (< 0.002 mm size)	18.28	18
Percent silt (< 0.002 mm size)	20.99	4
Percent of texture clayey	14.92	34
Percent of texture loamy	15.08	31
Percent of texture sandy	19.35	11
Percent of texture other	19.41	10
Alfisol (%)	16.51	24
Aridisol (%)	0	44
Entisol (%)	11.14	40
Histosol (%)	13.47	37
Inceptisol (%)	18.31	17
Mollisol (%)	18.21	20
Spodosol (%)	15.47	29
Ultisol (%)	-2.61	45
Vertisol (%)	2.28	43