Predictor Importance Values for shortleaf pine (Pinus echinata)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	20.96	25
Mean May-September precipitation (mm)	26.86	6
Mean annual temperature (°C)	21.92	21
Mean May-September temperature (°C)	22.99	19
Mean temperature of coldest month (°C)	24.62	12
Mean temperature of warmest month (°C)	26.01	8
Annual aridity index	17.78	33
Minimum elevation	19.66	28
Maximum elevation	23.19	16
Average elevation	21.04	24
Median elevation	19.44	29
Range of elevation	23.07	17
Elevation coefficient ofvariation	21.79	22
Elevation standard deviation	18.5	31
Annual daylength coefficient of variation	25.47	10
Total available water capacity (cm, to 150 cm)	27.44	4
Total available water supply (cm, to 150 cm)	22.82	20
Depth to water table (cm)	36.86	1
Soil permeability rate (cm/hr)	23.72	15
Soil calcium carbonate (% by weight)	16.51	37
Soil cation-exchange capacity	20.15	26
Soil pH	24.33	13
Soil bulk density (g/cm3)	25.34	11
Organic matter content (% by weight)	15.85	39
Potential soil productivity	17.38	35
Soil erodibility factor, rock fragment free	24.17	14
Soil erosion by wind (tons/acre/year)	19.97	27
Percent soil passing sieve No. 10 (coarse)	21.34	23
Percent soil passing sieve No. 200 (fine)	27.18	5
Percent clay (< 0.002 mm size)	23.01	18
Percent sand (< 0.002 mm size)	26.4	7
Percent silt (< 0.002 mm size)	28.89	3
Percent of texture clayey	18.23	32
Percent of texture loamy	19.37	30
Percent of texture sandy	17.41	34
Percent of texture other	16.89	36
Alfisol (%)	16.17	38
Aridisol (%)	1.39	45
Entisol (%)	7.59	44
Histosol (%)	10.28	42
Inceptisol (%)	25.84	9
Mollisol (%)	13.33	41
Spodosol (%)	8.06	43
Ultisol (%)	29.15	2
Vertisol (%)	14.92	40