Table 1 Environmental variables considered for the distribution model
Category | Short name | Long name | Unit | Source |
|---|---|---|---|---|
Terrain | elevation | Elevation | m | |
| Â | slope | Slope | m/m | |
| Â | aspect | Aspect | Degree | Â |
Soil | sq1 | Nutrient availability | kg/ha | |
| Â | sq2 | Nutrient retention capacity | meq/100Â g | Â |
| Â | sq3 | Rooting conditions | m | Â |
| Â | sq5 | Excess salts | dS/m | Â |
| Â | sq6 | Toxicity | Â | Â |
| Â | sq7 | Workability | Â | Â |
Solar radiation | srad1 | Direct normal irradiation | kWh/m2 | |
| Â | srad2 | Global horizontal irradiation | kWh/m2 | Â |
Climate | bio2 | Mean diurnal range | °C | |
|  | bio3 | Isothemality | °C |  |
|  | bio4 | Temperature seasonality | °C |  |
|  | bio7 | Temperature annual range | °C |  |
| Â | bio14 | Precipitation of driest month | mm | Â |
| Â | bio15 | Precipitation seasonality | mm | Â |
| Â | bio18 | Precipitation of warmest quarter | mm | Â |
| Â | bio19 | Precipitation of coldest quarter | mm | Â |