重金属胁迫对紫花苜蓿种子萌发的影响

Impacts of heavy metal stress on alfalfa germination

本文利用发芽试验 ,依据土壤环境质量标准设置单一重金属铜、锌、镉胁迫浓度 ,研究其对紫花苜蓿种子萌发的影响 ;并在此基础上研究三种重金属复合污染对紫花苜蓿的胁迫作用。结果表明 ,在单一重金属胁迫条件下 ,当溶液中铜和锌的浓度分别达到 2 0mg/L和 80mg/L时 ,紫花苜蓿根芽长受到明显的抑制 ,与对照相比 ,差异极显著。在重金属铜、锌、镉复合污染条件下 ,铜、锌之间存在明显的交互作用 ,镉的存在会加剧铜、锌对紫花苜蓿的胁迫作用。

This paper discusses the impact of the single and compound heavy metal contamination （copper, zinc and cadmium） on the germination of alfalfa by cultivated experiments in the concentrations of each heavy metal according to the Chinese Soil Environment Equality Standard. The results indicate that the length of root and bud of alfalfa are obviously stressed when the concentration of Cu and Zn is 20mg/L and 80mg/ L respectively. And compared with the controlled sample, the difference is extremely remarkable. Under the compound heavy metals contamination, there is obviously interaction between copper and zinc. Moreover the stress effect of copper and zinc on alfalfa is strengthened by the existence of cadmium.