Plateau topsoil variation coefficient sorted by size as heavy metals Sb> Ni> Cd> Pb> Cr> Mo> Cu> Sc> Co> Mn> Zn> Fe> Ba, wherein, Sb genus of extreme variability (> 100%), Cd, cr, Mo, Ni, and Pb is a high variability (50% to 100%), strong spatial heterogeneity, a preliminary determination of heavy metals may be present above six-point source pollution.
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