Predictor Importance Values for Virginia pine (Pinus virginiana)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	24.61	8
Mean May-September precipitation (mm)	26.64	2
Mean annual temperature (°C)	23.01	14
Mean May-September temperature (°C)	26.49	3
Mean temperature of coldest month (°C)	20.67	22
Mean temperature of warmest month (°C)	23.16	13
Annual aridity index	26.46	4
Minimum elevation	17.49	32
Maximum elevation	15.49	36
Average elevation	13.33	39
Median elevation	10.75	40
Range of elevation	20.36	23
Elevation coefficient ofvariation	21.63	18
Elevation standard deviation	19.11	29
Annual daylength coefficient of variation	23.95	10
Total available water capacity (cm, to 150 cm)	24.36	9
Total available water supply (cm, to 150 cm)	21.26	19
Depth to water table (cm)	28.57	1
Soil permeability rate (cm/hr)	20.88	21
Soil calcium carbonate (% by weight)	15.35	37
Soil cation-exchange capacity	21.02	20
Soil pH	20.09	27
Soil bulk density (g/cm3)	23.86	11
Organic matter content (% by weight)	20.11	26
Potential soil productivity	23.36	12
Soil erodibility factor, rock fragment free	19.49	28
Soil erosion by wind (tons/acre/year)	26.41	5
Percent soil passing sieve No. 10 (coarse)	25.71	6
Percent soil passing sieve No. 200 (fine)	13.94	38
Percent clay (< 0.002 mm size)	21.75	17
Percent sand (< 0.002 mm size)	20.31	24
Percent silt (< 0.002 mm size)	18.52	30
Percent of texture clayey	17.27	33
Percent of texture loamy	16.06	35
Percent of texture sandy	17.68	31
Percent of texture other	21.97	16
Alfisol (%)	16.45	34
Aridisol (%)	1	45
Entisol (%)	4.96	44
Histosol (%)	8.85	41
Inceptisol (%)	25.04	7
Mollisol (%)	20.24	25
Spodosol (%)	7.41	43
Ultisol (%)	22.12	15
Vertisol (%)	8.49	42