摘要： 采用温室土培盆栽试验研究了重金属Cu、Zn、Pb和Cd在土壤-萝卜系统中的迁移累积规律。试验结果表明,土壤Cu、Zn、Pb和Cd的浓度分别为800,1000,1000, 5.0mg⁄kg时,萝卜的生长则受到了明显的抑制作用。随着土壤重金属处理浓度的增加,萝卜根系的Cu、Zn、Pb和Cd浓度明显增加。在萝卜生长90d时,随着土壤重金属浓度的增加,地上部Cu、Zn、Pb和Cd的浓度均明显增加。随着生长期的延长,萝卜地上部Pb的浓度显著增加。随着土壤重金属浓度的增加,萝卜根系的Cu、Zn、Pb和Cd浓度均明显增加。适量的土壤Cu、Zn、Pb和Cd浓度能显著促进萝卜根系的吸收,但土壤Cu浓度超过一定范围后,萝卜根系的Cu浓度没有明显变化。随萝卜生长时间的延长,根系Zn和Cd浓度有明显下降的趋势,而根系Pb浓度有明显升高的趋势。在土壤加入重金属处理条件下,重金属Cu、Pb和Cd在萝卜不同部位的分布规律是根>茎叶,Zn是茎叶>根。萝卜对Cu、Zn、Pb和Cd的富集能力顺序由大到小依次是Cd>Zn>Cu>Pb。

关键词: 萝卜, 重金属, 迁移, 累积, 规律

Abstract: Heavy metal pollution in agricultural land becomes more and more serious in recent years. The soil culture experiments were performed to study the accumulation and mobility of heavy metals Cu,Zn,Pb and Cd soil-radish mg/kg,the system. The results showed that the concentration of soil Cu,Zn,Pb and Cd were 800,1000,1000,5.0, the growth of radish was inhibited obviously. With the increase of soil heavy metal concentrations,Cu,Zn,Pb and Cd concentration in root of radish significantly increased. The growth for 90 days,with the increase of soil heavy metal concentration,concentration of Cu,Zn,Pb and Cd in shoot increased significantly. With the growth period extended,Pb concentration in shoot of radish significantly increased. With the increase of soil heavy metal concentradons,Cu,Zn,Pb and Cd concentrations in root of radish were significantly increased. The amount of soil Cu,Zn,Pb and Cd significantly promoted the absorption of radish root but the soil Cu concentration exceeding a certain range,Cu concentration in root of radish have no significant changes. With the extension of growth time,Zn and Cd in root were significantly decreased,and Pb concentration significantly increased. Distribution of heavy metals in different parts of radish on different soil heavy metals content:the order of Cu}Pb and Cd content was root>stem and leaf the order of Zn content was stem and leaf> root.The order of radish enrichment ability was Cd>Zn>Cu>Pb.

Key words: Radish, Heavy metal, Mobility, Accumulation, Regularity

中图分类号: 

• S152.1