【摘要】 为了探索铅镉胁迫下苹果酸、草酸对刺槐生长与离子富集特性的影响，本试验以刺槐植株为研究对象，在铅600 mg/kg、镉20 mg/kg污染土壤中添加不同浓度的苹果酸、草酸，测定刺槐生长量、铅镉含量和离子转移特性等指标。结果表明，苹果酸和草酸对铅镉胁迫下刺槐植株生长有一定程度的抑制作用，但作用不显著。苹果酸和草酸可促进刺槐根部的铅、镉离子富集，但会降低铅、镉离子的转运率，其中草酸8.0 mmol/kg对铅富集的促进作用最显著。因此，草酸8.0 mmol/kg可作为一种外源调控手段应用于刺槐修复铅镉污染土壤的实践中。更多还原

【Abstract】 In order to explore the effects of malic acid and oxalic acid on the growth and ion accumulation characteristics of Robinia pseudoacacia under Pd and Cd stress, this experiment took Robinia pseudoacacia plants as the research object, and added different concentrations of malic acid and oxalic acid to the soil contaminated Pd 600 mg/kg and Cd 20 mg/kg to measure the plant growth, Pb and Cd content and ion transfer characteristics of Robinia pseudoacacia.The results showed that malic acid and oxalic acid could inhibit the growth of Robinia pseudoacacia under Pb and Cd stress to some extent, but the effect was not significant. Malic acid and oxalic acid could promote Pb and Cd ion accumulation in Robinia pseudoacacia roots, but reduced the ion transfer rate of Pb and Cd, and oxalic acid 8.0 mmol/kg had the most significant promoting effect on Pb accumulation. Therefore, oxalic acid 8.0 mmol/kg can be used as an exogenous regulation method in the practice of Robinia pseudoacacia in the remediation of Pb and Cd contaminated soil.更多还原