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[1]Ajiguli·Mamuti,Maimaitituerxun·Aizezi,Ainiwaer·Maimaiti.Vertical Distribution Characteristics and Risk Assessment of Soil Heavy Metal Contamination of Farmlands in Yanqi County, Xinjiang[J].Research of Soil and Water Conservation,2018,25(02):367-373.

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Vertical Distribution Characteristics and Risk Assessment of Soil Heavy Metal Contamination of Farmlands in Yanqi County, Xinjiang

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 367-373 Column: Public date: 2018-04-03

Title:: Vertical Distribution Characteristics and Risk Assessment of Soil Heavy Metal Contamination of Farmlands in Yanqi County, Xinjiang

Author(s):: Ajiguli·Mamuti¹, Maimaitituerxun·Aizezi¹, Ainiwaer·Maimaiti²; 1. College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
2. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Keywords:: soil layer; heavy metal; contamination; ecological risk; Yanqi County

CLC:: X53;X820.4

DOI:: -

Abstract:: The contamination and ecological risks of heavy metals of farmland soils for different soil layers (0-20 cm and 20-40 cm) in Yanqi County, Xinjiang, were analyzed based on Nemerow Pollution Index (NPI), Potential Ecological Risk Index (RI) and Ecological Risk Warning (I_ER). As, Cd, Cr, Cu, Mn, Ni, Pb and Zn of farmland soils in Yanqi County have accumulated to a certain extent. The average concentrations of Cd, Cr, Ni, Pb and Zn for 0-20 cm soil layer exceeded 1.50, 1.39, 1.37, 2.13 and 4.14 times of the background values of irrigation soil in Xinjiang, respectively. For two soil layers, Zn fell into high pollution level, Pb fell into moderate pollution, Cd, Ni and Cr fell into light pollution level, Cu and As fell into slight pollution level, and Mn presented no pollution. The average NPI value for each soil layer fell into light contamination level, whereas the average RI value fell into light ecological risk statue, and the average I_ER value fell into no ecological warning statue. The contamination levels and ecological risk degrees of heavy metals for 0-20 cm and 20-40 cm soil layers were same. As, Cd, Ni, Pb and Zn of 0-20 cm soil layer were mainly affected by the human activities, whereas Cu and Mn were mainly affected by the geochemical background of soils, and the main sources of Cr may be affected by the interaction of human factors and natural factors. Cd was the main pollution factor, and ecological risk factor for 0-20 cm and 20-40 cm soil layers, the contamination risks of Cd in farmland soils of study area should be the major concern.

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