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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

From: Comparisons of allometric and climate-derived estimates of tree coarse root carbon stocks in forests of the United States

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