PDF(Pubmed)
Abstract：
The combination of soil amendments with plants can be a viable option for restoring the functionality of PTEs-contaminated soils. Soil recovery could be further optimized through the mixed cropping of plant species (e.g. legumes and grasses) with different physiological characteristics. The aim of this study was to assess the phytoremediation ability of Vicia villosa Roth. And Lolium rigidum Gaud. Grown alone or in mixture in a soil contaminated with PTEs (C), i.e. Cd (23 mg kg-1), Pb (4473 mg kg-1) and Zn (3147 mg kg-1), and amended with 3% biochar (C + B). Biochar improved soil fertility and changed PTEs distribution, reducing soluble fractions and increasing the more stable ones. The addition of biochar increased the plant biomass of hairy vetch and annual ryegrass, both in monoculture and when in mixture. For example, shoot and root biomass of the C + B intercropped hairy vetch and annual ryegrass increased 9- and 7-fold, and ∼3-fold respectively, compared to the respective C plants. The biochar addition decreased PTE-uptake by both plants, while mixed cropping increased the uptake of PTEs by shoots of hairy vetch grown in C and C + B. The bioaccumulation, translocation factors, and mineralomass showed that hairy vetch and annual ryegrass behaved as phytostabilising plants. PTE mineralomasses proved that mixed cropping in C + B increased the overall capacity of PTE accumulation by plant tissues, particularly the root system. Therefore, the combination of biochar and legumes/grasses mixed cropping could be an effective solution for the recovery of PTEs-contaminated soils and the mitigation of their environmental hazard.
摘要：
土壤改良剂与植物的结合可能是恢复受PTE污染的土壤功能的可行选择。可以通过具有不同生理特征的植物物种（例如豆类和草）的混合种植来进一步优化土壤恢复。本研究的目的是评估紫菜的植物修复能力。和黑麦草高德。在受PTE（C）污染的土壤中单独生长或混合生长，即Cd（23mgkg-1），铅（4473mgkg-1）和锌（3147mgkg-1），并用3%生物炭(C+B)修正。生物炭提高了土壤肥力，改变了PTEs的分布，减少可溶性部分，增加更稳定的部分。生物炭的添加增加了紫云杉和一年生黑麦草的植物生物量，无论是在单一文化中还是在混合物中。例如,CB间作豌豆和一年生黑麦草的芽和根生物量增加了9倍和7倍，和分别为3倍，与各自的C植物相比。添加生物炭降低了两种植物的PTE吸收，而混合种植增加了在C和CB中生长的紫菜枝条对PTEs的吸收。易位因素，和矿物质表明，有毛的vetch和一年生黑麦草具有植物稳定作用。PTE矿物质证明，CB混合种植增加了植物组织对PTE的总积累能力，尤其是根系。因此,生物炭和豆科植物/草混合种植的结合可能是恢复受PTE污染的土壤和减轻其环境危害的有效解决方案。
