The Evaluation and Sources of Heavy Metal Anomalies in the Surface Soil of Eastern Tibet

With the rapid development of economy, heavy metal soil pollution causes ecosystem deterioration and raises serious concerns. Topsoil samples (n = 205) were collected to investigate characteristics, risk levels, sources metals in topsoil eastern Tibet. Heavy contents, such as As, Hg, Pb, Cr, Mn, Mo, Ni, Cu, Zn, Cd, tested, potential analyzed using correlational principal component analysis. The results showed high content levels Cd which 1.42 2.45 times higher than background values Tibet Plateau at beginning this century, respectively. enrichment factor (EF), geoaccumulation index (Igeo), Nemero composite (PN) that Hg main pollutants due traffic flow mining activities, but degree was generally not relatively concentrated central northern parts. analysis mainly affected by natural factors factors, activities agricultural also played a certain role. Cu while Mo multiple nature traffic.