Department of Agriculture, Food, Environment and Forestry, University of Florence, Piazzale Delle Cascine 18, 50144, Firenze, Italy.
RE-CORD, Renewable Energy COnsortium for R&D, Viale Kennedy 182, 50038, Scarperia e San Piero, Florence, Italy.
Chemosphere. 2022 Jan;287(Pt 1):131986. doi: 10.1016/j.chemosphere.2021.131986. Epub 2021 Aug 23.
Urban soil pollution by heavy metals (HMs) is a pressing problem in the development of urban agriculture (UA). In this context, the use of amendments, such as biochar, and phytoremediation are considered potentially cost-effective alternatives to conventional methods, and can be also combined to improve the remediation of soils from HMs. A pot experiment was performed to investigate the combined effect of berseem clover (Trifolium alexandrinum, L.) and biochar amendment in remediating a sandy soil collected near a shooting range area co-contaminated with Cd, Cr, Cu, Ni, Pb, and Zn. The biochar, obtained from a wood-chip gasifier fed with a mix of Douglas (Pseudotsuga menziesii, Mirb.) and Black Pine (Pinus nigra, J.F.Arnold) wood, was applied at two rates (0.8% and 1.6%, w/w). Eighteen weeks after sowing, all plants were harvested. The roots and aboveground tissues of the crops were separately collected and analyzed. The tested biochar effectively adsorbed the HMs (Cd, Cr, Cu, Ni, Pb, and Zn) from the soil. Biochar increased DW production of aboveground and root tissues. Moreover, biochar significantly reduced the concentration of Cr, Cu, Ni, and Pb in the aboveground tissues of berseem clover, although a significant reduction was not detected for Cd and Zn. Results indicated that berseem clover was a Cr, Ni and Pb excluder. However, this species can be considered suitable for Cu phytoextraction and Cd and Zn phytostabilization of slightly polluted urban soil. Only the Cu levels in the aerial biomass were below the acceptable limit for use as fodder.
城市土壤重金属（HMs）污染是城市农业（UA）发展面临的紧迫问题。在这种情况下，使用生物炭等改良剂被认为是传统方法的潜在经济有效替代方法，也可以与植物修复相结合，以改善受 HMs 污染的土壤的修复。进行了一项盆栽实验，以研究在修复附近射击场地区共污染 Cd、Cr、Cu、Ni、Pb 和 Zn 的沙质土壤时，三叶草（Trifolium alexandrinum，L.）和生物炭改良剂的联合作用。生物炭是由木屑气化炉产生的，气化炉的原料是混合的花旗松（Pseudotsuga menziesii，Mirb.）和黑松（Pinus nigra，J.F.Arnold）木材，以两种剂量（0.8%和 1.6%，w/w）施用。播种后 18 周，所有植物均收获。分别收集和分析作物的根和地上组织。测试的生物炭有效地从土壤中吸附了 HMs（Cd、Cr、Cu、Ni、Pb 和 Zn）。生物炭增加了地上和根组织的 DW 产量。此外，生物炭显著降低了三叶草地上组织中 Cr、Cu、Ni 和 Pb 的浓度，尽管 Cd 和 Zn 的浓度没有显著降低。结果表明，三叶草是 Cr、Ni 和 Pb 的排斥物。然而，这种物种可以被认为适合于 Cu 的植物提取和轻度污染城市土壤中 Cd 和 Zn 的植物稳定化。只有地上生物量中的 Cu 水平低于用作饲料的可接受限值。
