Predictor Importance Values for sourwood (Oxydendrum arboreum)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	30.36	3
Mean May-September precipitation (mm)	26.34	15
Mean annual temperature (°C)	21.37	26
Mean May-September temperature (°C)	13.67	38
Mean temperature of coldest month (°C)	18.52	32
Mean temperature of warmest month (°C)	22.13	23
Annual aridity index	29.47	6
Minimum elevation	13.33	39
Maximum elevation	21.95	24
Average elevation	17.46	34
Median elevation	16.98	36
Range of elevation	19.83	29
Elevation coefficient ofvariation	26.04	16
Elevation standard deviation	19.66	30
Annual daylength coefficient of variation	22.17	22
Total available water capacity (cm, to 150 cm)	30.62	2
Total available water supply (cm, to 150 cm)	25.67	18
Depth to water table (cm)	29.22	7
Soil permeability rate (cm/hr)	27.48	12
Soil calcium carbonate (% by weight)	15.95	37
Soil cation-exchange capacity	19.37	31
Soil pH	24.27	20
Soil bulk density (g/cm3)	27.24	13
Organic matter content (% by weight)	21.61	25
Potential soil productivity	20.76	27
Soil erodibility factor, rock fragment free	26	17
Soil erosion by wind (tons/acre/year)	23.41	21
Percent soil passing sieve No. 10 (coarse)	24.66	19
Percent soil passing sieve No. 200 (fine)	17.39	35
Percent clay (< 0.002 mm size)	29.68	4
Percent sand (< 0.002 mm size)	26.89	14
Percent silt (< 0.002 mm size)	28.76	8
Percent of texture clayey	11.3	40
Percent of texture loamy	27.81	9
Percent of texture sandy	29.64	5
Percent of texture other	20.26	28
Alfisol (%)	27.51	11
Aridisol (%)	1.68	45
Entisol (%)	11.14	41
Histosol (%)	10.46	42
Inceptisol (%)	35.49	1
Mollisol (%)	17.82	33
Spodosol (%)	8.17	44
Ultisol (%)	27.8	10
Vertisol (%)	9.4	43