Table S1. Predictors used in Cubist models; see Viscarra Rossel et al. (2015) for source references. Theme Name of surrogate Description Environmental factor Source variable Soil and Kaolinite, Illite, Clay mineral abundances soil, lithology, relief, climate Viscarra Rossel (2011) parent material Smectite PC1, PC2, PC3 First three principal components of vis--NIR soil, relief, climate Viscarra Rossel and spectra representing soil organic and Chen (2011) mineral composition: PC1 represents soil with abundant haematite PC2 represents soil rich in organic matter PC3 represents soil with abundant smectite, illite and goethite dose, K, U and Th Gamma radiometrics dose and soil, lithology Minty et al. (2009) concentrations in % and mg kg-1, respectively Magnetics Magnetic anomalies in nanoTesla (nT) units soil, lithology Milligan et al. (2004) Gravity Bouguer gravity anomaly, Gal soil, lithology GA (2009) Climate Rainfall Average annual rainfall, mm climate, relief, biota, soil Xu and Hutchinson (2011) Minimum Average annual minimum temperature / climate, relief, biota, soil temperature Maximum Average annual maximum temperature/ climate, relief, biota, soil temperature Potential Mean annual evapotranspiration/mm climate, relief, biota, soil evapotranspiration Solar radiation Mean annual solar radiation in J m-2 year-1 climate, biota, relief, soil Prescott Prescott index climate, relief, soil, biota Prescott (1950)
Table S1. Predictors used in Cubist models; see Viscarra Rossel et al. (2015) for source references. Theme Name of surrogate variable Description Environmental factor Source Soil and parent material Kaolinite, Illite, Smectite Clay mineral abundances soil, lithology, relief, climate Viscarra Rossel (2011) PC1, PC2, PC3 First three principal components of vis--NIR spectra representing soil organic and mineral composition: PC1 represents soil with abundant haematite PC2 represents soil rich in organic matter PC3 represents soil with abundant smectite, illite and goethite soil, relief, climate Viscarra Rossel and Chen (2011) dose, K, U and Th Gamma radiometrics dose and concentrations in % and mg kg-1, respectively soil, lithology Minty et al. (2009) Magnetics Magnetic anomalies in nanoTesla (nT) units soil, lithology Milligan et al. (2004) Gravity Bouguer gravity anomaly, Gal soil, lithology GA (2009) Climate Rainfall Average annual rainfall, mm climate, relief, biota, soil Xu and Hutchinson (2011) Minimum temperature Average annual minimum temperature / climate, relief, biota, soil Maximum temperature Average annual maximum temperature/ climate, relief, biota, soil Potential evapotranspiration Mean annual evapotranspiration/mm climate, relief, biota, soil Solar radiation Mean annual solar radiation in J m-2 year-1 climate, biota, relief, soil Prescott Prescott index climate, relief, soil, biota Prescott (1950)
1-s2.0-S0048969715307804-mmc1.docx