重金属在桃树体上的分布情况

Distribution Levels of Heavy Metals in Peach Trees

以5个桃树品种为试材,研究了重金属铅(Pb)、镉(Cd)、铬(Cr)和铜(Cu)在桃树体不同部位上的分布水平及状态。结果表明:Pb分布为果实<树干韧皮部<结果枝韧皮部<叶片;Cd为果实<叶片<树干韧皮部<结果枝韧皮部;Cr和Cu分布为果实<结果枝韧皮部<树干韧皮部<叶片。果园土壤中Pb、Cd、Cr及Cu的含量水平分别为18.637、0.408、62.595、15.728 mg/kg。相对土壤中金属元素的含量,果实中各元素的平均累积比率(果实/土壤)大小依次为:Cr<Pb<Cd<Cu。

Distribution levels of five heavy metals（lead,Pb;cadmium,Cd;chromium Cr and copper Cu） in peach trees were studied.The results showed that Pb accumulated in fruitphloem of trunkphloem of branchleaves,Cd in fruitleavesphloem of trunkphloem of branch,Cr and Cu in fruitphloem of branchphloem of trunkleaves.Pd,Cd,Cr and Cu concentration in soil were 18.637,0.408,62.595,15.728 mg/kg,respectively.In contrast to those in soil,average ratio of accumulation of four metals in fruit was CrPbCdCu.