Predictor Importance Values for southern red oak (Quercus falcata)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	22.7	24
Mean May-September precipitation (mm)	31.39	3
Mean annual temperature (°C)	25.35	14
Mean May-September temperature (°C)	20.04	29
Mean temperature of coldest month (°C)	24.92	16
Mean temperature of warmest month (°C)	23.21	21
Annual aridity index	26.08	11
Minimum elevation	20.36	28
Maximum elevation	25.17	15
Average elevation	24.23	17
Median elevation	23.51	20
Range of elevation	27.49	8
Elevation coefficient ofvariation	32.64	1
Elevation standard deviation	30.76	4
Annual daylength coefficient of variation	15.86	37
Total available water capacity (cm, to 150 cm)	28.51	7
Total available water supply (cm, to 150 cm)	26.98	10
Depth to water table (cm)	29.62	6
Soil permeability rate (cm/hr)	29.83	5
Soil calcium carbonate (% by weight)	16.62	35
Soil cation-exchange capacity	22.49	25
Soil pH	16.37	36
Soil bulk density (g/cm3)	18.74	31
Organic matter content (% by weight)	22.44	26
Potential soil productivity	22.27	27
Soil erodibility factor, rock fragment free	23.2	22
Soil erosion by wind (tons/acre/year)	22.82	23
Percent soil passing sieve No. 10 (coarse)	25.93	12
Percent soil passing sieve No. 200 (fine)	25.38	13
Percent clay (< 0.002 mm size)	32.22	2
Percent sand (< 0.002 mm size)	14.56	39
Percent silt (< 0.002 mm size)	27.09	9
Percent of texture clayey	13.16	42
Percent of texture loamy	18.3	32
Percent of texture sandy	14.47	40
Percent of texture other	18.77	30
Alfisol (%)	16.72	34
Aridisol (%)	1.49	45
Entisol (%)	18.16	33
Histosol (%)	9.98	43
Inceptisol (%)	23.93	18
Mollisol (%)	14.12	41
Spodosol (%)	5.28	44
Ultisol (%)	23.52	19
Vertisol (%)	15.58	38