(in decreasing order of importance)
| Predictor Name | Importance Score | Rank |
|---|---|---|
| Mean May-September precipitation (mm) | 10.51 | 1 |
| Percent clay (< 0.002 mm size) | 9.3 | 2 |
| Annual precipitation (mm) | 9.15 | 3 |
| Soil slope (%) of a soil component | 9.14 | 4 |
| Cropland (%) | 9 | 5 |
| Range of elevation (m) | 8.99 | 6 |
| Depth to bedrock (cm) | 7.93 | 7 |
| Forest land (%) | 7.8 | 8 |
| Mean annual temperature (°C) | 7.31 | 9 |
| Water (%) | 7.08 | 10 |
| Percent soil passing sieve No. 200 (fine) | 6.88 | 11 |
| Potential soil productivity (m3 of timber/ha) | 6.87 | 12 |
| Ultisol (%) | 6.8 | 13 |
| Soil permeability rate (cm/hr) | 6.71 | 14 |
| Nonforest land (%) | 6.54 | 15 |
| Maximum elevation (m) | 6.46 | 16 |
| Entisol (%) | 6.22 | 17 |
| Inceptisol (%) | 5.92 | 18 |
| Minimum elevation (m) | 5.88 | 19 |
| Average elevation (m) | 5.84 | 20 |
| Soil pH | 5.65 | 21 |
| Soil erodibility factor, rock fragment free | 5.52 | 22 |
| Percent soil passing sieve No. 10 (coarse) | 5.5 | 23 |
| Total available water capacity (cm, to 152 cm) | 5.25 | 24 |
| Elevation coefficient of variation | 4.82 | 25 |
| Mean January temperature (°C) | 4.71 | 26 |
| Mollisol (%) | 4.29 | 27 |
| Alfisol (%) | 3.73 | 28 |
| Mean July temperature (°C) | 3.09 | 29 |
| Soil bulk density (g/cm3) | 2.83 | 30 |
| Mean May-September temperature (°C) | 2.65 | 31 |
| Mean difference between July and January Temperature (°C) | 2.51 | 32 |
| Fragmentation Index (Riitters et al. 2002) | 1.96 | 33 |
| Organic matter content (% by weight) | 1.37 | 34 |
| Spodosol (%) | 1 | 35 |
| Vertisol (%) | 0.54 | 36 |
| Aridisol (%) | 0 | 37 |
| Histosol (%) | 0 | 38 |