Predictor Importance Values for southern magnolia (Magnolia grandiflora)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	11.83	17
Mean May-September precipitation (mm)	10.34	26
Mean annual temperature (°C)	12.79	12
Mean May-September temperature (°C)	11.04	21
Mean temperature of coldest month (°C)	12.05	14
Mean temperature of warmest month (°C)	13.44	7
Annual aridity index	14.68	2
Minimum elevation	8.03	36
Maximum elevation	5.92	41
Average elevation	5.46	43
Median elevation	5.11	44
Range of elevation	13.3	8
Elevation coefficient ofvariation	11.94	15
Elevation standard deviation	12.65	13
Annual daylength coefficient of variation	13.69	5
Total available water capacity (cm, to 150 cm)	6.68	39
Total available water supply (cm, to 150 cm)	10.09	30
Depth to water table (cm)	18.03	1
Soil permeability rate (cm/hr)	11.29	19
Soil calcium carbonate (% by weight)	10.21	28
Soil cation-exchange capacity	10.29	27
Soil pH	14.52	3
Soil bulk density (g/cm3)	10.93	23
Organic matter content (% by weight)	12.97	9
Potential soil productivity	9.47	31
Soil erodibility factor, rock fragment free	11.83	16
Soil erosion by wind (tons/acre/year)	8.74	32
Percent soil passing sieve No. 10 (coarse)	13.51	6
Percent soil passing sieve No. 200 (fine)	7.79	37
Percent clay (< 0.002 mm size)	12.83	10
Percent sand (< 0.002 mm size)	11.34	18
Percent silt (< 0.002 mm size)	10.49	25
Percent of texture clayey	12.79	11
Percent of texture loamy	10.94	22
Percent of texture sandy	8.37	33
Percent of texture other	10.86	24
Alfisol (%)	8.26	34
Aridisol (%)	0	45
Entisol (%)	8.12	35
Histosol (%)	7.07	38
Inceptisol (%)	6.05	40
Mollisol (%)	11.13	20
Spodosol (%)	10.17	29
Ultisol (%)	14.23	4
Vertisol (%)	5.67	42