Spatial Distribution and Sources Assessment of Heavy Metals in Vineyard Soil of Turpan Basin
- WANG Wei-wei
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In order to understand the distribution and sources of heavy metals in vineyard soil in Turpan Basin, Xinjiang, a total of 101 soil samples were collected from vineyards, and analyzed for the concentrations of six heavy metal elements, i.e. As, Cd, Cr, Ni, Pb, and Hg. The spatial distribution of heavy metals in vineyard soils was analyzed based on the GIS technology, while the main sources were analyzed using correlation analysis and principal component analysis. Obtained results indicate that the average concentrations of the six elements in vineyard soil in Turpan Basin were lower than the limits of the National Soil Environmental Quality Standards (GB 15618-2018), but the average concentrations of As, Cd, Cr, and Hg were 1.05, 1.58, 1.49, and 1.15 times as the background values of irrigated soil in Xinjiang, respectively. The spatial distribution patterns of the six elements of vineyard soil in Turpan were substantially heterogeneous. In the case of As, the high concentrations were observed mainly in the eastern areas, whereas Cd was most concentrated in the southwestern area and Cr was most concentrated in the central areas. A dot-distributed pattern was discerned for Ni, whereas Pb and Hg were most concentrated in the areas with relatively dense population and traffic in the study area. As, Cr, and Ni elements in vineyard soil are mainly from natural sources, whereas Cd, Pb, and Hg elements are mainly from anthropogenic sources.