School of Metallurgy and Environment, Central South University, Changsha 410083, China.
School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Ecotoxicol Environ Saf. 2019 Mar;169:306-315. doi: 10.1016/j.ecoenv.2018.11.017. Epub 2018 Nov 17.
Co-planting with multiple plant species has great value for the remediation of soil co-contaminated with metal(loid)s. A pot experiment has been conducted to study the growth, phytoextraction of metal(loid) and complementarity by co-planting Pteris vittata L. with three metal(loid)-tolerant species with large biomass (namely Arundo donax L., Morus alba L., and Broussonetia papyrifera L.) on soil co-contaminated with As, Cd, Pb, and Zn. The results showed that the co-planting can favor the growth and uptake of As in hyperaccumulator P. vittata L., and improve comprehensive extraction of metal(loid). The total biomass and content of As in the roots of P. vittata L. under the co-planting system were significantly (p < 0.05) improved by 117.5% and 122.0%, respectively, compared with that in monoculture, while the content of As, Cd, Pb and Zn in the tissues of A. donax L., M. alba L. and B. papyrifera L. was slightly increased. The comprehensive accumulation amounts for As, Cd, Pb, and Zn by the four plants co-planting in contaminated soil were higher than that in part of plant's monoculture. Moreover, availability of As, Cd, and Zn in the contaminated soil was decreased in the co-planting system, meanwhile soil urease and acid phosphatase activities in soil significantly (p < 0.05) promoted as compared to the monocultures. The results suggested that positive interaction between hyperaccumulator and three metal(loid)-tolerant species can effectively enhance the growth of P. vittata L., regulate the comprehensive metal(loid)s accumulation capacity, and improve the environmental quality of contaminated soil, which drives high phytoremediation potential for metal(loid)s-contaminated soil by the co-planting.
共植多种植物对修复金属（类）复合污染土壤具有重要价值。采用盆栽试验研究了蜈蚣草与 3 种生物量大的耐金属（类）植物（即芦苇、桑树和构树）共植对砷（As）、镉（Cd）、铅（Pb）和锌（Zn）复合污染土壤中蜈蚣草生长、金属（类）提取和互补性的影响。结果表明，共植可以促进超积累植物蜈蚣草对 As 的生长和吸收，提高金属（类）的综合提取率。与单植相比，共植系统中蜈蚣草根的总生物量和 As 含量分别显著（p < 0.05）提高了 117.5%和 122.0%，而芦苇、桑树和构树的根、茎、叶中 As、Cd、Pb 和 Zn 的含量略有增加。四种植物共植在污染土壤中的综合积累量高于部分植物单植的积累量。此外，与单植相比，共植系统中污染土壤中 As、Cd 和 Zn 的有效性降低，同时土壤脲酶和酸性磷酸酶活性显著（p < 0.05）提高。结果表明，超积累植物与 3 种耐金属（类）植物之间的正相互作用可以有效促进蜈蚣草的生长，调节其对金属（类）的综合积累能力，改善污染土壤的环境质量，从而提高共植对污染土壤中金属（类）的植物修复潜力。
