Nano-Fe₃O₄-modified biochar (BC-Fe) was prepared by the coprecipitation of nano-Fe₃O₄ on a rice husk biochar surface. The effects of BC-Fe on cadmium (Cd) bioavailability in soil and on Cd accumulation and translocation in rice (Oryza sativa L. cv. ‘H You 518’) were investigated in a pot experiment with 7 application rates (0.05-1.6%, w/w). BC-Fe increased the biomass of the rice plants except for the roots and affected the concentration and accumulation of Cd and Fe in the plants. The Cd concentrations of brown rice were significantly decreased by 48.9%, 35.6%, and 46.5% by the 0.05%, 0.2%, and 0.4% BC-Fe treatments, respectively. Soil cation exchange capacity (CEC) increased by 9.4%-164.1% in response to the application of BC-Fe (0.05-1.6%), while the soil Cd availability decreased by 6.81%-25.0%. However, 0.8-1.6% BC-Fe treatments promoted Cd transport to leaves, which could increase the risk of Cd accumulation in brown rice. Furthermore, BC-Fe application promoted the formation of iron plaque and enhanced the root interception of Cd. The formation of iron plaque reduced the toxicity of Cd to rice roots, but this barrier effect was limited and had an interval threshold (DCB-Fe: 22.5-27.3 g·kg^-1) under BC-Fe treatments.

通过在稻壳生物炭表面上共沉淀纳米Fe ₃ O ₄来制备纳米Fe ₃ O ₄改性生物炭（BC-Fe）。在BC-铁对镉（Cd）的生物利用度在土壤和镉积累和转移的稻（效果稻L.简历 在盆栽实验中对“ H优518”进行了研究，施用量为7种（0.05-1.6％，w / w）。BC-Fe增加了水稻植物除根部外的生物量，并影响了Cd和Fe在植物中的浓度和积累。通过0.05％，0.2％和0.4％的BC-Fe处理，糙米中的Cd浓度分别显着降低了48.9％，35.6％和46.5％。施用BC-Fe（0.05-1.6％）后，土壤阳离子交换容量（CEC）增加了9.4％-164.1％，而土壤Cd的利用率降低了6.81％-25.0％。但是，0.8-1.6％的BC-Fe处理促进了Cd向叶片的转运，这可能会增加Cd在糙米中积累的风险。此外，BC-Fe的施用促进了铁斑的形成，并增强了Cd的根系截留。^-1）在BC-Fe处理下。