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| The soil heavy metal pollution and ecological risk assessment of wheat fields in Yanqi Basin |
| Received:December 20, 2016 |
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| KeyWord:farmland;heavy metal;pollution;ecological risk;Yanqi Basin |
| Author Name | Affiliation | | Mamattursun EZIZ | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Research Center for Urban Development in Silk Road Economic Belt, Xinjiang Normal University, Urumqi 830054, China | | Ajigul MAMUT | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China | | Mattohti ANAYIT | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China | | Anwar MOHAMMAD | College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China |
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| Abstract: |
| A total of 35 soil samples were collected from wheat fields in Yanqi Basin, Xinjiang, and determined the contents of eight heavy metal elements (As, Cd, Cr, Cu, Mn, Ni, Pb and Zn) by standard methods. The soil heavy metal pollution of wheat fields was analyzed based on Nemerow pollution index (NPI), potential ecological risk index (RI) and ecological risk warning index (IER). Results of the research indicated that： the average contents of Cd in wheat field soils of Yanqi Basin exceeded 11.12 times of the National Soil Environmental Quality Standard (Grade Ⅱ); The average contents of Cd, Cr, Ni, Pb and Zn exceeded 55.58, 1.32, 1.48, 3.21 times and 4.47 times of the background values for irrigation soils in Xinjiang, respectively; Cd, Pb and Zn fell into high pollution level, whereas Cr and Ni fell into light pollution level, As and Cu fell into slightly pollution level, and Mn fell into no pollution level for wheat field soils. The average value of NPI was 7.93, which showed a heavy pollution level; The average value of RI of soil was 342.95, which showed a highly ecological risk situation; The average value of IER of soil was 5.68, which showed a serious warning situation. The RI and IER of soil gradually increased from the northern parts to the southern parts of study area; Ni, Pb and Zn of wheat field were affected mainly by the human activities, whereas Cu, Mn and Cr were controlled mainly by the geochemical background of soils, and the main sources of As and Cd may be affected by the interaction of human activities and natural factors. Cd was the main pollution factor and the main ecological risk factor of wheat fields in Yanqi Basin, the pollution risk of Cd should be a major concern in the study area. |
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