Table 2 Maximum, mean and minimum values of the climatic, stand, soil and topographic variables considered to fit the boosted regression trees model
From: Shrub richness is primarily driven by climate conditions in Southwestern European woodlands
Variable | Minimum | Mean | Maximum | |
|---|---|---|---|---|
Climatic variables | Â | Â | Â | |
| Â | Rainfall (mm) | 177.0 | 707.2 | 1988.0 |
|  | Temperature (°C) | 1.8 | 12.3 | 19.8 |
| Â | Var_Temp | 0.1 | 0.5 | 2.7 |
| Â | Var_Rainfall | 0.1 | 0.4 | 0.9 |
Stand variables | Â | Â | Â | |
| Â | Basal area (m2 ha-1) | 0.4 | 14.0 | 79.7 |
| Â | Plot DBH (cm) | 7.5 | 22.0 | 158.8 |
| Â | N (# trees ha-1) | 5 | 502 | 5889 |
Soil variables | Â | Â | Â | |
| Â | Bulk density (cg cm-3) | 86.0 | 119.1 | 150.0 |
| Â | Sand (g kg-1) | 124.0 | 388.7 | 712.0 |
| Â | Silt (g kg-1) | 129.0 | 383.2 | 676.0 |
| Â | Clay (g kg-1) | 81.0 | 228.1 | 427.0 |
| Â | Coarse fragments (cm3 dm-3) | 64.0 | 170.8 | 336.0 |
| Â | CEC (mmol(c) kg-1) | 148.0 | 259.8 | 517.0 |
| Â | Organic carbon (dg kg-1) | 160.0 | 677.2 | 1727.0 |
| Â | pH | 4.5 | 6.5 | 8.2 |
| Â | Nitrogen (cg kg-1) | 158.0 | 514.1 | 1254.0 |
Topographic variables | Â | Â | Â | |
|  | Slope (°) | 0.0 | 4.2 | 30.3 |
|  | Aspect (°) | 0.0 | 181.6 | 360.0 |
| Â | Altitude (m) | 0.0 | 792.6 | 2657.0 |