十堰烟区土壤、地表水和烟叶重金属评价及相关性研究

系统调查了湖北十堰烟叶产区土壤、地表水重金属残留状况,对烟区土壤、水环境质量进行了综合评价,并分析了不同种类重金属元素在土壤和烟叶中的富集作用和相关性,结果表明:土壤中Pb、Hg、As、Cr、Cu、Zn的含量均符合无公害生产产地标准,Cd、Ni元素有极少数样品超标,40个土壤样品的内梅罗综合污染指数为0.34～0.90,不存在污染样品,水污染各项指标均未超标,总体环境质量状况良好,适宜发展优质烟叶生产。由于烟草属于Cd富集作物,烟叶中的Cd含量与土壤中Cd含量存在较高的相关性,烟叶Hg、Cu、Zn、Ni、Pb、As、Cr等重金属的含量与土壤中的含量相关性不明显。

Assessment of Heavy Metals in Soil, Surface Water and Tobacco Leaf in Shiyan Area and Their Correlations

The results of the investigation and analysis of heavy metal residue in the soil and surface water in Shiyan tobacco planting area showed that the contents of Pb,Hg,As,Cr,Cu,Zn in the soil conformed to the national environmental quality standards for hazard-free agricultural products.There were only few samples which exceeded the allowable figure in Cd and Ni element respectively.Synthetic pollution assessment demonstrated that there were no contaminated samples.The water quality of this area was good for the flue-cured tobacco leaves production.Tobacco belonged to Cd enrichment crop.Cd content in tobacco leaf had a high correlation with that in soil,but not including Hg,Cu,Zn,Ni,Pb,As,Cr.