淄博烟区土壤中微量元素特征及重金属风险评价

Distribution Characteristics of Medium and Trace Elements and Risk Assessments for Heavy Metals in Soils in Zibo Tobacco-planting Region

为明确淄博烟田土壤的中微量元素丰缺特征及重金属风险特征,在淄川、博山和沂源3个烟叶主产区采集42个典型土壤样品,测定了基本养分指标、4种中微量元素(Ca、Mg、B和Mo)及8种重金属元素(Cd、Hg、As、Pb、Cr、Cu、Ni和Zn),并采用地积累指数法和内梅罗指数法进行了污染风险评价。研究结果表明,淄博3个主产烟区(沂源、博山和淄川)土壤pH呈中性,有机质含量较缺乏,速效钾含量呈中等-缺乏水平,全氮和有效磷含量为较丰富-丰富水平;交换性钙和交换性镁的总体含量极丰富,有效硼和有效钼含量处于适宜水平。地积累指数和内梅罗指数评价结果表明,淄博烟区土壤重金属安全性较好,适宜优质烟叶的安全生产。

In order to clarify the abundance characteristics of trace elements and risk assessments for heavy metals in soils in Zibo tobacco-planting region,42 typical soil samples were collected in three tobacco planting areas in Zichuan,Boshan and Yiyuanareas.The concentrations of four kinds of trace elements(Ca,Mg,B and Mo)and 8 kinds of heavy metal elements(Cd,Hg,As,Pb,Cr,Cu,Ni and Zn)were measured,and the pollution risk was evaluated by the method of geoaccumulation index and nemerow index.The results showed that the soil pH in the three main tobacco production areas(Yiyuan,Boshan and Zibo)of Zibo was neutral in general,while the soil organic matter content was poor,and the available potassium content showed a medium to low status.The content of available phosphorus was in a rich and richer status;the overall contents of exchangeable calcium and exchangeable magnesium were very rich,and effective boron and effective molybdenum were at suitable levels.The evaluation results of the geoaccumulation index and Nemerow index showed that the soil heavy metals in Zibo tobacco areas are safe and suitable for high-quality tobacco planting.