Table 3 Summary of random forests model output and their importance scores (% IncMSE) for predicting refined estimates belowground C using basic stand structure, management, and physiographic variables
Variable | % IncMSE | Variable | % IncMSE |
|---|---|---|---|
With aboveground biomass | Without aboveground biomass | ||
Aboveground biomass | 34.5 | Stand age | 33.8 |
Stand age | 20.7 | Stand origin | 29.1 |
Stand origin | 19.0 | Longitude | 27.5 |
Latitude | 16.8 | Elevation | 19.8 |
Longitude | 15.9 | Latitude | 16.4 |
Elevation | 13.6 | Hopkins index | 14.8 |
Hopkins index | 12.8 | ||
R 2 | 0.87 | R 2 | 0.47 |
RMSE (Mg C ha-1) | 3.72 | RMSE (Mg C ha-1) | 7.47 |