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.
新疆焉耆县耕地土壤重金属垂直分布特征与污染风险
- Title:
- Vertical Distribution Characteristics and Risk Assessment of Soil Heavy Metal Contamination of Farmlands in Yanqi County, Xinjiang
- Keywords:
- soil layer; heavy metal; contamination; ecological risk; Yanqi County
- 分类号:
- X53;X820.4
- 摘要:
- 采用内梅罗综合污染指数（NPI）、潜在生态风险指数（RI）和生态风险预警指数（IER），对新疆焉耆县耕地不同土层（0-20，20-40 cm）土壤重金属污染及生态风险进行了评估。结果表明：焉耆县耕地土壤中As，Cd，Cr，Cu，Mn，Ni，Pb与Zn含量有一定的积累。0-20 cm土层的Cd，Cr，Ni，Pb和Zn含量的平均值分别超出新疆灌耕土背景值的1.50，1.39，1.37，2.13，4.14倍。两个土层Zn均呈现重度污染，Pb呈现中度污染，Cd，Ni和Cr呈现轻度污染，Cu和As呈现轻微污染，Mn无污染。两个土层NPI平均值均呈现轻度污染态势，RI平均值均呈现轻微生态风险态势，IER平均值均呈现无警态势。研究区0-20 cm和20-40 cm土层土壤重金属的污染水平与生态风险等级差异不明显。0-20 cm土层As，Cd，Ni，Pb和Zn主要受到人为因素的影响，Cu和Mn主要受土壤地球化学特征的影响，Cr受自然因素和人为因素共同影响。Cd是研究区0-20 cm和20-40 cm土层最主要的污染因子和生态风险因子，耕地土壤Cd污染风险必须关注。
- 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 (IER). 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 IER 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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备注/Memo
收稿日期:2017-4-1;改回日期:2017-4-27。
基金项目:国家自然科学基金（41561073）；新疆杰出青年科技人才培养项目（qn2015jq003）
作者简介:阿吉古丽·马木提(1990-),女,新疆喀什人,硕士研究生,研究方向为干旱区土壤环境安全。E-mail:AjigulM@126.com
通讯作者:麦麦提吐尔逊·艾则孜(1981-),男,新疆喀什人,博士,副教授,主要从事绿洲土壤环境安全研究。E-mail:oasiseco@126.com