Type Variable code Environmental factor Unit
Climatic factor bio4 Variation coefficient of air temperature 1
bio5 The highest temperature in the hottest month ×10°C
bio6 The lowest temperature in the coldest month ×10°C
bio7 Annual range of temperature ×10°C
bio13 Precipitation of the wettest month mm
bio14 The driest monthly precipitation mm
Topographic factors elev Altitude m
Soil factor t_cec_soil Cation exchange capacity of topsoil %
t_ece Electrical conductivity of topsoil dS/m
t_gravel Gravel volume in topsoil %
t_oc Organic carbon content in topsoil %
t_silt Silt content in topsoil %