| 太滆运河流域农田土壤重金属污染特征与来源解析 |
| 摘要点击 2555 全文点击 746 投稿时间：2019-03-28 修订日期：2019-05-31 |
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| 中文关键词 太滆运河流域 土壤重金属 空间分布 污染评价 来源解析 |
| 英文关键词 Taige canal valley soil heavy metal spatial distribution pollution assessment source apportionment |
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| 中文摘要 |
| 为探明太滆运河流域农田土壤重金属污染分布特征及主要影响因素，保证土壤环境质量及农产品安全.采集并分析了太滆运河流域118个农田表层土壤样品中Cr、Hg、As、Cu、Zn、Ni、Pb和Cd等8种重金属元素含量.以太湖流域土壤背景值为评价标准，利用单因子指数和内梅罗指数评价土壤重金属污染状况，利用多元统计分析与地统计分析相结合的方法，对土壤重金属空间分布及来源进行解析.结果表明：8种重金属元素（Cr、Hg、As、Cu、Zn、Ni、Pb和Cd）的平均含量分别为63.25、0.25、7.83、35.24、77.25、31.48、38.37和0.16mg·kg-1，除Cr和As外，其余元素含量均超过太湖流域土壤背景值.土壤样点重金属含量多低于国家农用地土壤污染风险筛选值.内梅罗综合指数显示87.29%样点的土壤重金属呈现轻度污染，5.93%样点呈现中度污染，6.78%样点呈现重度污染，整体已经超过警戒值，处于轻度污染状态.流域农田土壤中Hg、Cu、Zn、Pb和Cd受到农业活动和大气沉降的共同影响； Cr和Ni则受成土母质以及工业生产活动的共同影响； As则主要来源于成土母质. |
| 英文摘要 |
| To determine the distribution characteristics of heavy metal pollution in farmland soils and related influencing factors in the Taige canal valley, and guarantee soil environmental quality and safety of agricultural products, 118 topsoil samples were collected from the Taige canal valley's farmland soils, and contents of chromium (Cr), mercury (Hg), arsenic (As), copper (Cu), zinc (Zn), nickel (Ni), lead (Pb), and cadmium (Cd) were measured. A single factor index and comprehensive index were used to assess soil heavy metal contamination with the soil background value of the Taihu Lake basin as the evaluation standard. The multivariate statistical analysis and the geostatistical analysis were combined to identify and apportion the pollution sources of soil heavy metals. The results showed that:The average concentrations of Cr, Hg, As, Cu, Zn, Ni, Pb, and Cd in soils were 63.25, 0.25, 7.83, 35.24, 77.25, 31.48, 38.37, and 0.16 mg·kg-1, respectively, all of which except for Cr and As were higher than the local soil background values. The content of each heavy metal in most soil samples were lower than the risk screening values for soil contamination of agricultural land. The comprehensive index showed that the degree of pollution of soil heavy metals were at a slightly polluted level in 87.29%, moderately polluted level in 5.93%, and severely polluted level in 6.78% of the sampling. Hg, Cu, Zn, Pb, and Cd in the watershed soil were affected by agricultural activities and atmospheric deposition. Cr and Ni were affected by the parent material and industrial production activities. As was mainly derived from the parent material. |
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