新疆准噶尔盆地未开垦盐碱地土壤重金属评价及其来源

doi:10.13866/j.azr.2019.04.05

Abstract

Abstract: The uncultivated saline-alkaline soil samples were collected from the Junggar Basin,Xinjiang.Seven kinds of heavy metals including Hg,Cd,Pb,Cr,Ni,As and Se in soil samples were examined.The multivariate statistical analysis and the pollution indexes were used in the survey,and the sources of heavy metals in different soil layers (0-20 cm and 20-40 cm in depth) were evaluated based on the soil background values of the heavy metals in Xinjiang (the soil background values of Se in Urumqi were adopted).The results showed that the average concentrations of Hg,Cd,Pb,Cr,Ni,As and Se in soil layer 0-20 cm in depth were 0.023,0.165,17.999,62.587,29.928,16.325 and 0.696 mg·kg^-1,and those in soil layer 20-40 cm in depth were 0.021,0.148,17.497,61.091,29.995,17.384 and 0.634 mg·kg^-1,respectively.Except for Pb,the contents of other elements were higher than the soil background values of the heavy metals in Xinjiang.The evaluation results of the single factor pollution index of each element in the study area were mainly pollution-free or slight pollution.The proportions of pollution-free and slight pollution of the seven elements in the two soil layers varied from 66.2% to 100% and from 74.7% to 100%,respectively.The Nemero comprehensive index showed that the slight pollution was dominant in the study area,and the proportions of the sites with slight pollution in the two soil layers were all 78.4%.The sources of heavy metal elements such as Cd,As and Se were mainly natural factors,which are mainly related to the composition and properties of soil parent materials.The sources of Cr,Pb and Hg were mainly affected by human factors.Heavy metals carried by industrial development,transportation and coal combustion fall into the soil,which is the main reason for the increase of background values of uncultivated and undamaged natural saline-alkaline soil.The source of Ni may be the result of human and natural factors.

Key words: saline-alkaline soil, soil heavy metal, background value, pollution evaluation, source analysis, Junggar Basin

MI Xiao-jun, REN Wen, LUO Qiong, MA Jian. Evaluation and Their Sources of Heavy Metals in Uncultivated Saline-Alkaline Soil in the Junggar Basin,Xinjiang[J].Arid Zone Research, 2019, 36(4): 824-834.

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Evaluation and Their Sources of Heavy Metals in Uncultivated Saline-Alkaline Soil in the Junggar Basin,Xinjiang

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