Table 1 Environment variables used in Biomod2 model for A. bunge.
Category | Variable (Unit) | Description | Variables used in modeling |
|---|---|---|---|
Climate | Bio1 (°C) | Annual mean air temperature | |
Bio2 (°C) | Mean diurnal temperature range (max. temp – min. temp) | √ | |
Bio3 | Isothermality (Bio2/Bio7) × 100 | √ | |
Bio4 (°C) | Temperature seasonality | ||
Bio5 (°C) | Max temperature of warmest month | √ | |
Bio6 (°C) | Min temperature of coldest month | ||
Bio7 (℃) | Temperature annual range | ||
Bio8 (°C) | Mean temperature of wettest quarter | ||
Bio9 (°C) | Mean temperature of driest quarter | √ | |
Bio10 (°C) | Mean temperature of warmest quarter | ||
Bio11 (°C) | Mean temperature of coldest quarter | ||
Bio12 (mm) | Annual precipitation | √ | |
Bio13 (mm) | Precipitation of wettest month | ||
Bio14 (mm) | Precipitation of driest month | √ | |
Bio15 (%) | Coefficient of variation of precipitation | √ | |
Bio16 (mm) | Precipitation of wettest quarter | ||
Bio17 (mm) | Precipitation of the driest quarter | ||
Bio18 (mm) | Precipitation of warmest quarter | ||
Bio19 (mm) | Precipitation of coldest quarter | ||
Srad (kJ m−2 d−1) | Solar radiation | √ | |
Vapr (hPa) | Vapour pressure | ||
Wind (m s−1) | Wind speed | ||
AI | Annual average dryness index | ||
PET (mm/day) | Annual average reference crop evapotranspiration | ||
Soil variables(T represents topsoil (0 to − 30 cm), S represents subsoil (30–100 cm) | T_CLAY | Topsoil Clay Fraction | √ |
T_SAND | Topsoil Sand Fraction | √ | |
T_BS | Topsoil Basic Saturation | ||
T_CACO3 | Topsoil Carbonate content | ||
T_CACO4 | Topsoil Sulfate Content | √ | |
T_CEC_CLAY | Cation Exchange Capacity of Sticky Layer Topsoil | √ | |
T_CEC_SOIL | Topsoil Cation Exchange Capacity | √ | |
T_ECE | Topsoil Electrical Conductivity | √ | |
T_ESP | Topsoil Exchangeable Sodium Salt | √ | |
T_GRAVEL | Topsoil Percentage of Crushed Stone Volume | √ | |
T_OC | Topsoil Organic Carbon Content | √ | |
T_PH_H2O | Topsoil pH | √ | |
T_REF_BULK | Topsoil Bulk Density | ||
T_SILT | Topsoil Silt Content | ||
T_USDA_TEX | Topsoil Texture Classification | √ | |
S_CLAY | Subsoil Clay Fraction (30–100 cm) | √ | |
S_SAND | Subsoil Sand Fraction (30–100 cm) | ||
S_BS | Subsoil Basic Saturation | √ | |
S_CACO3 | Subsoil Carbonate content | ||
S_CACO4 | Subsoil Sulfate Content | ||
S_CEC_CLAY | Cation Exchange Capacity of Sticky Layer Subsoil | √ | |
S_CEC_SOIL | Subsoil Cation Exchange Capacity | √ | |
S_ECE | Subsoil Electrical Conductivity | ||
S_ESP | Subsoil Exchangeable Sodium Salt | ||
S_GRAVEL | Subsoil Percentage of Crushed Stone Volume | √ | |
S_OC | Subsoil Organic Carbon Content | √ | |
S_PH_H2O | Subsoil pH | ||
S_REF_BULK | Subsoil Bulk Density | ||
S_SILT | Subsoil Silt Content | ||
S_USDA_TEX | Subsoil Texture Classification | √ | |
Sq1 | Nutrient availability | √ | |
Sq2 | Nutrient retention capacity | √ | |
Sq3 | Rooting conditions | √ | |
Sq4 | Oxygen availability to roots | √ | |
Sq5 | Excess salts | √ | |
Sq6 | Toxicity | √ | |
Sq7 | Workability (constraining field management) | ||
Topography | Asp(degrees) | Aspect | √ |
Ele(m) | Elevation above sea level | √ | |
Slop(%) | Slope | √ | |
Human activity | Hf | Human Footprint | √ |
