(in decreasing order of importance)
| Predictor Name | Importance Score | Rank |
|---|---|---|
| Mean May-September temperature (°C) | 28.35 | 1 |
| Mollisol (%) | 26.15 | 2 |
| Forest land (%) | 25.39 | 3 |
| Mean July temperature (°C) | 25.35 | 4 |
| Mean May-September precipitation (mm) | 24.78 | 5 |
| Alfisol (%) | 24.41 | 6 |
| Percent clay (< 0.002 mm size) | 23.75 | 7 |
| Depth to bedrock (cm) | 23.14 | 8 |
| Percent soil passing sieve No. 10 (coarse) | 22.32 | 9 |
| Total available water capacity (cm, to 152 cm) | 22.22 | 10 |
| Range of elevation (m) | 22.07 | 11 |
| Organic matter content (% by weight) | 20.24 | 12 |
| Ultisol (%) | 19.85 | 13 |
| Soil permeability rate (cm/hr) | 19.13 | 14 |
| Maximum elevation (m) | 18.82 | 15 |
| Annual precipitation (mm) | 18.68 | 16 |
| Soil pH | 18.05 | 17 |
| Mean January temperature (°C) | 17.69 | 18 |
| Soil slope (%) of a soil component | 17.62 | 19 |
| Potential soil productivity (m3 of timber/ha) | 17.33 | 20 |
| Average elevation (m) | 17.24 | 21 |
| Percent soil passing sieve No. 200 (fine) | 16.94 | 22 |
| Mean annual temperature (°C) | 16.44 | 23 |
| Minimum elevation (m) | 15.38 | 24 |
| Elevation coefficient of variation | 13.92 | 25 |
| Entisol (%) | 13.83 | 26 |
| Cropland (%) | 13.82 | 27 |
| Nonforest land (%) | 13 | 28 |
| Inceptisol (%) | 12.17 | 29 |
| Mean difference between July and January Temperature (°C) | 12.16 | 30 |
| Soil bulk density (g/cm3) | 11.16 | 31 |
| Fragmentation Index (Riitters et al. 2002) | 11.05 | 32 |
| Soil erodibility factor, rock fragment free | 8.7 | 33 |
| Histosol (%) | 4.31 | 34 |
| Water (%) | 3.9 | 35 |
| Spodosol (%) | 3.52 | 36 |
| Vertisol (%) | 2.93 | 37 |
| Aridisol (%) | 1 | 38 |