Predictor Importance Values for swamp chestnut oak (Quercus michauxii)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	16.62	11
Mean May-September precipitation (mm)	14.58	19
Mean annual temperature (°C)	11.42	31
Mean May-September temperature (°C)	6.26	42
Mean temperature of coldest month (°C)	11.13	33
Mean temperature of warmest month (°C)	6.13	43
Annual aridity index	15.87	15
Minimum elevation	16.69	10
Maximum elevation	16.99	7
Average elevation	12.73	26
Median elevation	14.49	20
Range of elevation	15.46	16
Elevation coefficient ofvariation	16.79	9
Elevation standard deviation	12.84	25
Annual daylength coefficient of variation	8.21	39
Total available water capacity (cm, to 150 cm)	14.48	21
Total available water supply (cm, to 150 cm)	11.88	30
Depth to water table (cm)	18.03	4
Soil permeability rate (cm/hr)	17.49	5
Soil calcium carbonate (% by weight)	20.06	3
Soil cation-exchange capacity	16.54	13
Soil pH	15.87	14
Soil bulk density (g/cm3)	23.42	1
Organic matter content (% by weight)	16.81	8
Potential soil productivity	13.56	23
Soil erodibility factor, rock fragment free	10.58	34
Soil erosion by wind (tons/acre/year)	15.25	17
Percent soil passing sieve No. 10 (coarse)	12.59	27
Percent soil passing sieve No. 200 (fine)	8.97	38
Percent clay (< 0.002 mm size)	16.58	12
Percent sand (< 0.002 mm size)	11.41	32
Percent silt (< 0.002 mm size)	15.18	18
Percent of texture clayey	14.44	22
Percent of texture loamy	12.3	28
Percent of texture sandy	13.47	24
Percent of texture other	11.94	29
Alfisol (%)	5.25	44
Aridisol (%)	0	45
Entisol (%)	7.65	40
Histosol (%)	10.22	35
Inceptisol (%)	20.75	2
Mollisol (%)	17.31	6
Spodosol (%)	7.16	41
Ultisol (%)	9.53	36
Vertisol (%)	9.06	37