商陆修复镉-锌复合污染土壤的潜力初探

Preliminary Study on the Repairing Potential of Phytolacca acinosa Roxb.on Cd-Zn Compound Pollution in Soil

为了解商陆修复镉-锌复合污染土壤的潜力。通过盆栽试验,研究了镉-锌复合污染发生时锌营养条件下镉污染对商陆生长及富集镉、锌能力的影响。商陆在镉-锌复合污染条件下,土壤中镉和锌的最大允许浓度分别建议为150和300 mg/kg。无论镉的单因子污染或是复合污染,商陆中镉的含量均随土壤中镉浓度的增加而增加。在商陆地上部镉-锌之间表现为协同作用,土壤中低浓度镉能促进植株吸收锌,而低浓度锌对植株吸收镉有激发作用。当土壤锌含量小于200 mg/kg时,镉-锌相互作用导致商陆根中镉的积累量随锌浓度增加而增加;大于200 mg/kg时表现为负相关。土壤中锌浓度为0-200 mg/kg时对商陆生长及富集镉总量有一定的促进作用。

The research was constructed to know the repairing potential of Phytolacca acinosa Roxb. on Cd-Zn compound pollution in soil. In pored experiments, under Cd-Zn compound pollution and the condition of Zn nutrition, the effects of Cd pollution on the growth of P. acinosa ,and the enrichment capability for Cd and Zn was studied.For P, acinosa under Cd-Zn comapound pollution, the maximum pennissible concentration for Cd and Zn were recommend as 150 mg/kg and 300 mg/kg respectively. The Cd content in P. acinosa was increased with the addition concentration of Cd in soil, whether under single-factor pollution or under compound pollution. Synergistic actions existed between Cd and Zn at the aerial part of P. acinosa. The low concentration of CA in soil promoted the Zn absorption in plants, while low concentration of Zn had motivating actions for the Cd absorption in plants. When the Zn content in soil was less than 200 mg/kg, the CA accumulation in the roots of P, acinosa was increased with the increment of Zn concentration, which caused by the interaction of CA and Zn. When the Zn content in soil was more than 200 mg/kg, the CA accumulation in root of P, acinosa had a negative correlation with the Zn concentration. Zn in soil with the concentration of 0 - 200 mg/kg promoted the growth of P. acinosa and total amount of CA enrichment.