重金属铅和镉在植物体内的分布及累积效应研究

Research on Distribution and Accumulation of Heavy Metal in Plants

在现代重金属污染已经是一个重要的环境问题,重金属的污染不再局限于土壤,对植物也有了较严重的影响。针对这一问题,本试验采用阳藿这一具有很高营养价值和经济价值的植物进行重金属铅和镉污染后的研究,试验以pH值为4.79的松林土和阳藿为供试材料,盆栽种植试验、室内化学分析及生物统计相结合的方法。研究结果表明:重金属铅和镉在阳藿体内分布较为广泛:根、茎、叶中都有。重金属铅在阳藿体内的最大累积量是446.03 mg/kg,镉在阳藿体内的最大累积量是11.23 mg/kg并且重金属对阳藿吸收营养元素也产生影响,重金属也对阳藿产生了一定的毒害;如叶片形态、叶绿素含量等,本试验对毒害只是初步的研究,要了解整个毒害机理和过程还必须再进行详细的分析研究。

In modern heavy metal pollution has been an important environment problem,is not limited to the soil heavy metal pollution,the plant has the serious influence.In order to solve this problem,this experiment adopts the Yang herb that has a high nutritional value and economic value of plants for heavy metal lead and cadmium pollution after the study experiment with pH value of 4.79 quaternary yellow soil and Yang grandiflorum used as material,potted plant experiment,the indoor combination of chemical analysis and biological statistics method.The results show that the heavy metal lead and cadmium in Yang herb are widely distributed:root,stem and leaf.The maximum number of accumulated heavy metal lead in the Yang herb is 446.03 mg/kg,the largest accumulation of cadmium in the Yang herb quantity is 11.23 mg/kg and heavy metal has an impact on Yang herb to absorb nutrients,heavy metals also have a certain poison on Yang herb;leaf form,the contents of chlorophyll and study of poisoning are preliminary in this experiment,to understand the whole process of poisoning mechanism and also to a detailed analysis of the research.