Wang Xiaohui, Zhou Cong, Xiao Xiyuan, Guo Zhaohui, Peng Chi, Wang Xiaoyan
Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, 932 Lushan South Road, Changsha, 410083, China.
Environ Sci Pollut Res Int. 2022 Dec;29(60):91356-91367. doi: 10.1007/s11356-022-21994-1. Epub 2022 Jul 27.
Intercropping with hyperaccumulators/accumulators is a promising alternative to enhance phytoextraction of heavy metal(loid)s in contaminated soil. In this research, a pot experiment was conducted to evaluate the influences of intercropping As hyperaccumulator Pteris vittata L. with Cd hyperaccumulator Sedum alfredii Hance or accumulator Hylotelephium spectabile (Boreau) H. Ohba on the plant growth, As and Cd phytoextraction, and rhizosphere bacterial microbiota. The results indicated that intercropping can promote the growth of plants. The total biomass of P. vittata, S. alfredii, and H. spectabile in intercropping systems was improved by 19.9-34.1%, 16.8%, and 11.5%, respectively, in comparison with corresponding plant monoculture. The As content in rhizoid and frond of P. vittata when intercropped with S. alfredii was significantly increased by 28.3% and 19.0% (P < 0.05), respectively, as compared with P. vittata monoculture, and this treatment acquired the maximum As and Cd accumulation with 2032 μg·pot and 397 μg·pot, respectively. Intercropping enhanced the soil bacterial community diversity. The genera of Lysobacter in P. vittata rhizosphere and Massilia and Arthrobacter in S. alfredii rhizosphere had higher abundance in the intercropping system of P. vittata and S. alfredii. There were significantly positive correlation relationships between Massilia and Arthrobacter with plant Cd content and Lysobacter with plant As content, indicating that they may play important roles in As and Cd phytoextraction. The results suggested that intercropping P. vittata with S. alfredii could be a potential strategy for phytoextraction of As and Cd from co-contaminated soil.
与超富集植物/富集植物间作是提高污染土壤中重金属（类金属）植物提取效率的一种有前景的替代方法。本研究通过盆栽试验，评估了将砷超富集植物蜈蚣草与镉超富集植物东南景天或镉富集植物八宝景天间作对植物生长、砷和镉的植物提取以及根际细菌微生物群的影响。结果表明，间作可促进植物生长。与相应的单作相比，间作系统中蜈蚣草、东南景天和八宝景天的总生物量分别提高了19.9% - 34.1%、16.8%和11.5%。与蜈蚣草单作相比，蜈蚣草与东南景天间作时，其假根和叶片中的砷含量分别显著增加了28.3%和19.0%（P < 0.05），该处理的砷和镉积累量最大，分别为2032 μg·盆和397 μg·盆。间作增强了土壤细菌群落多样性。在蜈蚣草与东南景天的间作系统中，蜈蚣草根际的溶杆菌属以及东南景天根际的马赛菌属和节杆菌属具有较高的丰度。马赛菌属和节杆菌属与植物镉含量、溶杆菌属与植物砷含量之间存在显著正相关关系，表明它们可能在砷和镉的植物提取中发挥重要作用。结果表明，蜈蚣草与东南景天间作可能是从复合污染土壤中植物提取砷和镉的一种潜在策略。
