Chen Min-Ni, Nie Xiao-Qi, Zhang Xing-Feng, He Chuan-Qian, Gao Bo
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China.
Huan Jing Ke Xue. 2023 Mar 8;44(3):1714-1726. doi: 10.13227/j.hjkx.202204198.
Regulation of exogenous substances and intercropping are effective methods to improve the efficiency of phytoremediation of heavy metal contaminated soil. A pot experiment was used to study the effects of earthworms, straw, and citric acid on the remediation of Zn, Pb, and Cd contaminated soil by monocropping and intercropping of and . The results showed that the bioaccumulation factors (BCF) of earthworms for Zn, Pb, and Cd were 0.07-0.13, 0.10-0.26, and 5.64-15.52, respectively. The addition of straw in the soil increased the biomass of earthworms by 22.29%-223.87% but reduced the heavy metal concentrations by 8.15%-62.58%. Straw and citric acid showed passivation and activation effects, respectively, but earthworms had no significant effect on the available concentrations of heavy metals in the soil. Earthworms had no significant effect on the heavy metal concentrations of but reduced the heavy metal concentrations of . Straw showed an inhibitory effect on the concentrations of heavy metals in but promoted the concentrations of Cd in Citric acid had no significant effect on the heavy metal concentrations in but significantly increased the Pb concentrations in Intercropping significantly reduced the soil available heavy metal concentrations and increased the heavy metal concentrations in plant roots; however, it had no significant effect on heavy metal concentrations in plant shoots. The total extraction amounts of Zn, Pb, and Cd by plants were mainly manifested as >intercropping>. The addition of earthworms increased the total extraction amounts of Zn, Pb, and Cd by 12.49%, 35.89%, and 29.01%, respectively, and the addition of straw+earthworms increased the total extraction amounts of Pb by 87.21%. The results indicated that straw significantly promoted the growth of earthworms and reduced their accumulation of heavy metals, and the addition of earthworms alone or in combination with straw can effectively improve the remediation potential of of Zn, Pb, and Cd contaminated soil.
外源物质调控和间作是提高重金属污染土壤植物修复效率的有效方法。通过盆栽试验研究了蚯蚓、秸秆和柠檬酸对单作和间作修复锌、铅和镉污染土壤的影响。结果表明，蚯蚓对锌、铅和镉的生物富集系数分别为0.07 - 0.13、0.10 - 0.26和5.64 - 15.52。土壤中添加秸秆使蚯蚓生物量增加了22.29% - 223.87%，但重金属浓度降低了8.15% - 62.58%。秸秆和柠檬酸分别表现出钝化和活化作用，但蚯蚓对土壤中重金属的有效浓度没有显著影响。蚯蚓对[具体植物1]的重金属浓度没有显著影响，但降低了[具体植物2]的重金属浓度。秸秆对[具体植物1]中重金属浓度有抑制作用，但促进了[具体植物2]中镉的浓度。柠檬酸对[具体植物1]中重金属浓度没有显著影响，但显著增加了[具体植物2]中铅的浓度。间作显著降低了土壤中有效重金属浓度，增加了植物根系中的重金属浓度；然而，对植物地上部分的重金属浓度没有显著影响。植物对锌、铅和镉的总提取量主要表现为[具体植物1]＞间作＞[具体植物2]。添加蚯蚓分别使锌、铅和镉的总提取量增加了12.49%、35.89%和29.01%，添加秸秆 + 蚯蚓使铅的总提取量增加了87.21%。结果表明，秸秆显著促进了蚯蚓的生长并降低了它们对重金属的积累，单独添加蚯蚓或与秸秆结合添加均可有效提高[具体植物1]对锌、铅和镉污染土壤的修复潜力。
