| A total of 53 farmland soil samples were collected from Yanqi County, Xinjiang, and the mass ratio of eight elements (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) were determined by standard methods. The spatial distribution patterns of these elements were analyzed based on GIS technology, and the main sources were distinguished by using multivariate statistical analysis method. Results showed that the average mass ratio of Cd, Cr, Ni, Pb and Zn exceeded by 0.50, 0.40, 0.33, 1.63 and 3.92 times of the background values of irrigation soil in Xinjiang, respectively. The mass ratio of As, Cd and Pb showed a gradually increasing trend from the northern part to the southern part in the study area, while Cr, Zn and Cu showed a decreasing trend. High value districts of Mn and Ni were appeared in the western part. As, Cd, Ni and Pb in farmland soils were mainly affected by human activities, whereas Cu and Mn were mainly controlled by soil geochemistry characteristics. The main sources of Cr and Zn were affected by the interaction of human activities and natural factors. |
