不同木薯品种对重金属Cu Zn Cd累积差异及健康风险分析  

Accumulation of heavy metals copper, zinc, and cadmium in cassava varieties and the associated human health risk

作　　者：曾露苹 秦俊豪[1,2,3] 董淑玉 张润涵 黎华寿[1,2,3] 

机构地区：[1]华南农业大学热带亚热带生态研究所,广州510642 [2]农业部华南热带农业环境重点实验室,广州510642 [3]华南农业大学广东省高等学校农业生态与农村环境重点实验室,广州510642

出　　处：《农业环境科学学报》2017年第6期1044-1052,共9页Journal of Agro-Environment Science

基　　金：国家高技术研究(863)项目(2013AA102402);广东省科技计划项目(2014A030304036;2015B090903077)~~

摘　　要：木薯在污染土壤上的生物修复和能源植物利用方面具有巨大潜力。为探究不同木薯品种重金属Cu、Zn、Cd的吸收转运差异及人体暴露风险评估,选取华南地区生产上常用的三个木薯品种(华南5号、华南205号、华南8号)进行污染小区试验。结果表明,华南8号在三个木薯品种中产量最高,在宁西样地可达53 125 kg·hm^(-2),三个木薯品种各组织器官中Cu、Zn、Cd的含量均表现为:茎>叶>块根;进一步比较发现,华南8号对三种重金属的总富集量系数最大,其中Cu为4.30、Zn为2.86、Cd为2.80,适宜在中轻度污染土壤上推广种植。靶标危害系数方法(THQ)计算结果显示,宁西样地三个木薯品种通过块根途径暴露接触重金属对成人和儿童均具潜在健康风险。Cassava（Manihot esculenta）has great potential for bioremediation of contaminated soil and utilization as an energy plant. Three cassava varieties（SC5, SC205, and SC8）were selected to investigate the differences in their accumulation of heavy metals copper（Cu）, zinc（Zn）, and cadmium（Cd）and to perform human health risk assessments through field plot experiments. The results showed that SC8 had the highest yield among the three cassava cultivars, at up to 53 125 kg·hm-2 at the sample site Ningxi. The concentrations of Cu, Zn, and Cd in the three cassava varieties were all ranked in the order stem 〉 leaf 〉 root. The total enrichment coefficient of SC8 was much higher than that of the other two cassava cultivars, with Cu of 4.30, Zn of 2.86, and Cd of 2.80. It may be important to promote planting of cassava variety SC8 in moderately polluted soil. Furthermore, the result of target hazard quotient（THQ） analyses showed that adults and children who consume cassava tubers and roots from the Ningxi plots had potential health risks due to heavy metal contamination.

关 键 词：木薯品种 土壤重金属 Cu ZN CD 植物修复 健康风险分析 

分 类 号：X171.5[环境科学与工程—环境科学]