不同萝卜品种对5种重金属响应规律研究

为探究萝卜对土壤中镉(Cd)、砷(As)、铅(Pb)、汞(Hg)和铬(Cr)5种重金属的累积特性,采用温室盆栽试验,通过测定9个不同萝卜品种不同部位的重金属含量,结合重金属富集系数和转移系数以及单因子污染指数法、内梅罗综合污染指数法综合评价萝卜对上述5种重金属的响应规律。结果表明,萝卜地下部对5种重金属富集能力依次为Cd>Pb>Cr>Hg>As,并较易发生重金属的向上转移,地上部较地下部更易累积重金属;萝卜品种和重金属种类均可显著影响重金属累积,且二者交互作用明显。研究发现春不老是一种高产且重金属低累积的萝卜品种。本研究结果为萝卜安全生产及消费提供了指导。

Study on Response Characteristics of Different Radishes Genotypes to Five Heavy Metals

To study the accumulation characteristics of radish to cadmium (Cd), arsenic (As), lead (Pb), mercury (Hg) and chromium (Cr) in soil, pot experiments under greenhouse were conducted on nine different radishes genotypes in this paper. The accumulation characteristics were analyzed by combined the determination of heavy metal content in their different parts, biological concentration factor and transfer factor of heavy metals, and individual pollution index and nemero comprehensive pollution index. Results indicated that the accumulation abilities of five heavy metals of underground parts in radishes followed the order of Cd > Pb > Cr > Hg > As, and the upward migrations of five heavy metals were more likely to occur, and thus the aerial part in radish was more vulnerable to heavy metal pollution than its underground part. Moreover, results also showed that both radish genotypes and varieties of heavy metals can significantly affect the accumulation of heavy metals, and the interaction between them was obvious. It was found that chunbulao radish could be selected as a potential low-heavy metal-accumulated radish genotype with a higher yield. This study provides guidance on safety planting and consumption.