Predictor Importance Values for loblolly pine (Pinus taeda)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	32.28	24
Mean May-September precipitation (mm)	39.49	8
Mean annual temperature (°C)	32.43	22
Mean May-September temperature (°C)	25.94	35
Mean temperature of coldest month (°C)	36.95	14
Mean temperature of warmest month (°C)	22.89	38
Annual aridity index	31	29
Minimum elevation	32.15	26
Maximum elevation	31.18	28
Average elevation	28.77	31
Median elevation	27.61	34
Range of elevation	32.25	25
Elevation coefficient ofvariation	45.3	3
Elevation standard deviation	37.11	13
Annual daylength coefficient of variation	31.93	27
Total available water capacity (cm, to 150 cm)	41.13	4
Total available water supply (cm, to 150 cm)	37.62	11
Depth to water table (cm)	40.11	7
Soil permeability rate (cm/hr)	36.44	15
Soil calcium carbonate (% by weight)	19.5	39
Soil cation-exchange capacity	27.66	33
Soil pH	39.15	9
Soil bulk density (g/cm3)	46.12	1
Organic matter content (% by weight)	36.15	16
Potential soil productivity	29.28	30
Soil erodibility factor, rock fragment free	38.94	10
Soil erosion by wind (tons/acre/year)	33.18	20
Percent soil passing sieve No. 10 (coarse)	32.29	23
Percent soil passing sieve No. 200 (fine)	35.57	17
Percent clay (< 0.002 mm size)	35	19
Percent sand (< 0.002 mm size)	35.2	18
Percent silt (< 0.002 mm size)	37.43	12
Percent of texture clayey	17.57	40
Percent of texture loamy	33.02	21
Percent of texture sandy	24.79	36
Percent of texture other	28.7	32
Alfisol (%)	40.41	5
Aridisol (%)	1.1	45
Entisol (%)	6.57	44
Histosol (%)	14.02	43
Inceptisol (%)	40.24	6
Mollisol (%)	23.34	37
Spodosol (%)	16.71	41
Ultisol (%)	45.7	2
Vertisol (%)	15.64	42