小分子有机酸诱导野苋菜修复Pb污染土壤

通过土培实验，研究小分子有机酸对野苋菜吸收重金属Pb的影响。结果表明，添加小分子有机酸处理能有效促进野苋菜的生长，显著提高野苋菜地上/下部Pb含量，柠檬酸、乙酸在15 mmol·kg-1，草酸在10 mmol·kg-1 时，植物Pb 积累量达到最大值，分别为15.625、18.732和9.072 mg·kg-1，高于对照166%、219%和54%；高浓度（20 mmol·kg-1）有机酸处理，对植株产生一定的毒害作用，影响植株富集Pb能力。3种有机酸均能促进植株地上部对Pb的吸收，作用表现为乙酸 > 柠檬酸 > 草酸，说明适当浓度的有机酸能增强土壤中重金属Pb的活性，提高植株修复Pb污染土壤的能力。

Wild amaranth remediation of Pb contaminated soil on induction of small molecular organic acid

Through a potting experiment, we explored the small molecular organic acid absorption effect of heavy metal Pb on wild amaranth.We found that organic acid treatment effectively promoted the growth of wild amaranth test plants and significantly improved the wild amaranth's upper/lower Pb content.With concentrations of citric acid, acetic acid of 15 mmol·kg-1, and oxalic acid of 10 mmol·kg-1, plant Pb accumulation reached maximum values of 15.625, 18.732, and 9.072 mg·kg-1, respectively, or 166%, 219%, and 54% greater than those of the control.A high concentration (20 mmol·kg-1) of organic acid had a toxic effect on the plant and affected the plant's ability to enrich Pb.Three kinds of organic acid promoted the absorption of Pb by the shoot:acetic acid > citric acid > oxalic acid (ranked from greatest to least effect).The appropriate concentration of organic acid may enhance the activity of heavy metal Pb in soils and improve plant remediation of Pb-contaminated soil.