Predictor Importance Values for slippery elm (Ulmus rubra)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	20.3	12
Mean May-September precipitation (mm)	23.16	4
Mean annual temperature (°C)	11.45	39
Mean May-September temperature (°C)	14.13	31
Mean temperature of coldest month (°C)	17.35	21
Mean temperature of warmest month (°C)	14.46	29
Annual aridity index	22.58	5
Minimum elevation	6.28	43
Maximum elevation	19.06	16
Average elevation	18.11	19
Median elevation	12.32	37
Range of elevation	14.78	27
Elevation coefficient ofvariation	17.22	22
Elevation standard deviation	20.38	11
Annual daylength coefficient of variation	20.4	10
Total available water capacity (cm, to 150 cm)	19.48	14
Total available water supply (cm, to 150 cm)	21.08	9
Depth to water table (cm)	21.95	6
Soil permeability rate (cm/hr)	21.78	7
Soil calcium carbonate (% by weight)	13.04	33
Soil cation-exchange capacity	19.43	15
Soil pH	14.69	28
Soil bulk density (g/cm3)	21.36	8
Organic matter content (% by weight)	12.42	36
Potential soil productivity	18.92	17
Soil erodibility factor, rock fragment free	16.69	24
Soil erosion by wind (tons/acre/year)	27.17	1
Percent soil passing sieve No. 10 (coarse)	23.46	3
Percent soil passing sieve No. 200 (fine)	20.19	13
Percent clay (< 0.002 mm size)	11.6	38
Percent sand (< 0.002 mm size)	12.98	34
Percent silt (< 0.002 mm size)	8.05	42
Percent of texture clayey	16.97	23
Percent of texture loamy	14.89	26
Percent of texture sandy	15.73	25
Percent of texture other	12.97	35
Alfisol (%)	26.91	2
Aridisol (%)	1.01	45
Entisol (%)	10.37	40
Histosol (%)	14.14	30
Inceptisol (%)	17.6	20
Mollisol (%)	18.66	18
Spodosol (%)	5.9	44
Ultisol (%)	9.43	41
Vertisol (%)	13.65	32