Cadmium (Cd) easily accumulates in tobacco, which endangers public health through Cd exposure from smoking. However, its uptake, translocation, and distribution in tobacco plants during plant development or its response to biochar application are poorly understood. A pot experiment was conducted with tobacco (Yunyan 87) grown in soil severely contaminated with Cd (30 mg kg⁻¹) amended with 0, 1, and 2% (w/w) tobacco stem-derived biochar (BC). The absorption and accumulation of Cd in all parts of the tobacco plants were most active from the rosette stage to the fast growing stage, during which approximately 90% of the Cd deposited in the tobacco leaves occurred, especially in the lower leaves. The Cd concentrations in most plant parts without added biochar decreased significantly by 52.61–78.30% due to the rapid increase in biomass (dilution effect), although the Cd concentration in the lower leaves increased by 48.89% (P < 0.05). However, with the slowdown of the growth rate of tobacco at the maturity stage, the proportion of Cd accumulation in roots and stems without biochar addition increased by 29.01%, resulting in an increased Cd concentration in roots and stems by 63.29–86.80% (P < 0.05). In the different growth stages, the application of biochar reduced the contents of DTPA-extractable and exchangeable Cd in the soil by 5.11–35.14% and 9.20–54.05%, respectively, thus reducing the absorption, accumulation and concentration of Cd in all parts of the tobacco plant. In addition, the inhibitive effect of biochar on the Cd concentration in the leaves was weak at the rosette stage (22.17–53.72%) compared with the other stages (46.14–78.88%), and the degree of inhibition of biochar on the Cd concentration in the middle leaves (37.94–59.24%) was lower than that in the upper and lower leaves (49.04–73.54%) at all developmental stages. However, the long-term remediation effect of biochar on soil Cd contamination needs to be further verified, and the combination of biochar and other technologies should receive additional attention.

镉 (Cd) 很容易在烟草中积聚，吸烟导致的镉暴露会危害公众健康。然而，人们对它在植物发育过程中在烟草植物中的吸收、易位和分布或其对生物炭应用的反应知之甚少。对种植在被镉（30 mg kg ^-1 ）严重污染​​的土壤中的烟草（云烟87）进行了盆栽试验，并用0%、1%和2%（w/w）烟茎生物炭（BC）进行了修正。烟株各部位对Cd的吸收和积累在莲座期至速生期最为活跃，在此期间沉积的Cd约90%发生在烟叶中，尤其是下部叶片。由于生物量的快速增加（稀释效应），未添加生物炭的大部分植物部位的Cd浓度显着下降了52.61-78.30%，尽管下部叶片的Cd浓度增加了48.89%（P < 0.05）。但随着成熟期烟草生长速度的减慢，未添加生物炭的根和茎中Cd积累比例增加了29.01%，导致根和茎中Cd浓度增加了63.29%~86.80%（P < 0.05）。在不同生长阶段，施用生物炭使土壤中DTPA可萃取Cd含量和可交换Cd含量分别降低5.11%~35.14%和9.20%~54.05%，从而降低了各部位对Cd的吸收积累和浓度。烟草厂。此外，莲座期生物炭对叶片Cd浓度的抑制作用（22.17%～53.72%）较其他阶段（46.14%～78.88%）弱，且生物炭对Cd浓度的抑制程度在中间的叶子（37.94-59.各发育阶段均低于上下叶（49.04-73.54%）。但生物炭对土壤Cd污染的长期修复效果有待进一步验证，且生物炭与其他技术的结合应受到额外关注。