Soil depth (cm) | Type | Model | R2 | CC | RMSE | MAPE | NMSE |
---|---|---|---|---|---|---|---|
0–30 | Model_Ori | RF | 0.520 | 0.654 | 3.331 | 0.727 | 0.491 |
GBM | 0.523 | 0.697 | 3.296 | 0.722 | 0.481 | ||
SVM | 0.410 | 0.582 | 3.671 | 0.770 | 0.597 | ||
Model_PC | RF | 0.526 | 0.669 | 3.297 | 0.700 | 0.481 | |
GBM | 0.553 | 0.719 | 3.189 | 0.653 | 0.450 | ||
SVM | 0.449 | 0.614 | 3.550 | 0.735 | 0.558 | ||
Model_H | RF | 0.523 | 0.664 | 3.311 | 0.706 | 0.489 | |
GBM | 0.527 | 0.700 | 3.285 | 0.704 | 0.478 | ||
SVM | 0.451 | 0.615 | 3.544 | 0.768 | 0.556 | ||
Basic data | MC_NitrDepAll (Wet deposition of inorganic nitrogen), MC_LAI (Leaf area index), MC_PAR (Photosynthetically active radiation), V_AGBC (Aboveground biomass carbon), V_NDVI (Normalized differential vegetation index), V_FAPAR (Fraction of absorbed photosynthetically active radiation), V_NPP (Net primary productivity), S_MicroCN (C:N ratio of soil microbial biomass) | ||||||
30–50 | Model_Ori | RF | 0.583 | 0.696 | 2.142 | 2.040 | 0.435 |
GBM | 0.563 | 0.723 | 2.150 | 2.175 | 0.439 | ||
SVM | 0.505 | 0.691 | 2.300 | 2.328 | 0.502 | ||
Model_PC | RF | 0.611 | 0.726 | 2.062 | 2.069 | 0.403 | |
GBM | 0.588 | 0.744 | 2.086 | 2.219 | 0.413 | ||
SVM | 0.538 | 0.712 | 2.215 | 2.428 | 0.466 | ||
Model_H | RF | 0.582 | 0.699 | 2.139 | 2.048 | 0.434 | |
GBM | 0.582 | 0.736 | 2.100 | 2.213 | 0.419 | ||
SVM | 0.508 | 0.681 | 2.282 | 2.392 | 0.494 | ||
Basic data | MC_Wind10 (10Â m wind speed), MC_Tem (Modern temperature), MC_Pre (Modern precipitation), V_EVI (Enhanced vegetation index), V_GPP (Gross primary productivity), V_NPP, MC_NitrDepAll, MC_PAR, V_LAI, V_NDVI, V_FAPAR | ||||||
50–100 | Model_Ori | RF | 0.655 | 0.761 | 3.730 | 0.919 | 0.360 |
GBM | 0.682 | 0.794 | 3.547 | 0.879 | 0.326 | ||
SVM | 0.637 | 0.776 | 4.758 | 0.847 | 0.366 | ||
Model_PC | RF | 0.670 | 0.777 | 3.637 | 0.887 | 0.343 | |
GBM | 0.693 | 0.810 | 3.462 | 0.847 | 0.311 | ||
SVM | 0.654 | 0.783 | 3.669 | 0.887 | 0.349 | ||
Model_H | RF | 0.648 | 0.757 | 3.761 | 0.882 | 0.367 | |
GBM | 0.692 | 0.802 | 3.487 | 0.858 | 0.315 | ||
SVM | 0.576 | 0.715 | 4.078 | 0.930 | 0.431 | ||
Basic data | MC_Wind10, MC_NitrDepAll, MC_PAR, V_EVI, V_GPP, V_NPP, V_FAPAR, S_MicroCN, S_MicroSMC (Soil microbial biomass carbon) | ||||||
100–200 | Model_Ori | RF | 0.768 | 0.764 | 8.283 | 1.556 | 0.319 |
GBM | 0.692 | 0.736 | 8.819 | 1.644 | 0.361 | ||
SVM | 0.745 | 0.846 | 7.444 | 1.714 | 0.257 | ||
Model_PC | RF | 0.778 | 0.790 | 7.926 | 1.647 | 0.292 | |
GBM | 0.775 | 0.806 | 7.734 | 1.673 | 0.278 | ||
SVM | 0.876 | 0.935 | 5.184 | 1.700 | 0.125 | ||
Model_H | RF | 0.809 | 0.777 | 8.017 | 1.563 | 0.299 | |
GBM | 0.794 | 0.806 | 7.662 | 1.644 | 0.273 | ||
SVM | 0.928 | 0.961 | 3.964 | 1.763 | 0.073 | ||
Basic data | T_Slope (Slope), V_SIF (Sun-Induced Chlorophyll Fluorescence), V_NPP, MC_Surrunoff (Surface runoff), MC_Wind10, MC_NitrDepAll, MC_PAR | ||||||
Paleoclimate factors | PC_Pre_LGM (Paleo-precipitation in the last glacial maximum), PC_Tem_LGM (Paleo-temperature in the last glacial maximum), PC_Pre_MidH (Paleo-precipitation in the mid-Holocene), PC_Tem_MidH (Paleo-temperature in the mid-Holocene) | ||||||
Human footprint factors | H_Population (Population density), H_HumanFp (Human footprint) |