Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
Sci Total Environ. 2019 Feb 10;650(Pt 1):594-603. doi: 10.1016/j.scitotenv.2018.09.055. Epub 2018 Sep 5.
The objective of this study was to determine the phytoextraction potential of a hyperaccumulator co-planted with a large biomass of woody plant in metal(loid)-contaminated soil. A pot experiment was conducted for 270 days (d) to study the growth, physiological responses, and metal(loid)s accumulation characteristics of plants, which included a shade-requiring, As-hyperaccumulator perennial herb, Pteris vittata L., co-planted with a woody tree, namely Morus alba L. or Broussonetia papyrifera L., for soil contaminated with arsenic (As), cadmium (Cd), lead (Pb), and zinc (Zn). The results showed that the biomass, photosynthetic pigment contents, antioxidant enzyme activity, and uptake of As in P. vittata L. were significantly enhanced by co-planting with M. alba L. or B. papyrifera L. Especially, the uptake of As by P. vittata L. was significantly (p < 0.05) increased by 80.0% and 64.2% when it was co-planted with M. alba L. or B. papyrifera L., respectively, while the As, Cd, Pb, and Zn contents of both M. alba L. and B. papyrifera L. were not significantly promoted by the co-planting. The comprehensive phytoextraction of metal(loid)s could be optimized by the co-planting of P. vittata L. with M. alba L. or B. papyrifera L. The total amount of As in the shoots from co-planting species was significantly (p < 0.05) higher than that of the monoculture with M. alba L. or B. papyrifera L., and that of Cd and Zn in the shoots was significantly (p < 0.05) higher than that of the monoculture with P. vittata L. The results showed that the co-planting of P. vittata L. with M. alba L. or B. papyrifera L. can alleviate the toxic effects of metal(loid)s on plant growth and improve the comprehensive phytoextraction amounts of metal(loid)s, and is a promising strategy for remediation of metal(loid)-contaminated soil.
本研究旨在确定超富集植物与木质生物质在金属（类）污染土壤中的联合萃取潜力。进行了一项为期 270 天（d）的盆栽实验，以研究植物的生长、生理响应和金属（类）积累特性，其中包括一种荫生、砷超富集多年生草本植物蜈蚣草，与一种木本树，即桑树或构树，共同种植在砷（As）、镉（Cd）、铅（Pb）和锌（Zn）污染的土壤中。结果表明，与桑树或构树共同种植显著提高了蜈蚣草的生物量、光合色素含量、抗氧化酶活性和对砷的吸收。特别是，当与桑树或构树共同种植时，蜈蚣草对砷的吸收分别显著（p<0.05）增加了 80.0%和 64.2%，而桑树或构树对砷、镉、铅和锌的含量并没有显著提高。通过蜈蚣草与桑树或构树的共同种植，可以优化金属（类）的综合萃取。与桑树或构树共同种植的物种地上部分的砷总量显著（p<0.05）高于单独种植桑树或构树的总量，地上部分的镉和锌总量也显著（p<0.05）高于单独种植蜈蚣草的总量。结果表明，蜈蚣草与桑树或构树的共同种植可以减轻金属（类）对植物生长的毒害作用，提高金属（类）的综合萃取量，是一种有前景的污染土壤修复策略。
