This study aimed to investigate the effects of rice straw biochar and lime (RBL) on the remediation of lead (Pb)-contaminated soil and mitigation of Pb translocation in rice plants by using pot experiments. Lead-contaminated soil collected from a farmland near a Pb-zinc (Zn) mine, biochar, limestone powder, and indica rice (Oryza sativa L.) were used in the present study. The experimental treatments included: (1) control (CK), (2) 2.5% biochar (RB1), (3) 5% biochar (RB2), (4) 0.6% lime (L1), (5) 1.2% lime (L2), (6) 2.5% biochar + 0.6% lime (RBL1), and (7) 2.5% biochar + 1.2% lime (RBL2). The results revealed that the treatment with RBL was more efficient than the treatment with only biochar or lime in decreasing CaCl₂-extractable Pb content in the soil by increasing soil pH and soluble sulfate content in the soil. Treatment with RBL reduced in the accumulation of Pb in the shoot of rice plants, this was mainly attributed to the decrease in the concentration of available Pb in the soil. The RBL2 treatment not only decreased the concentration of Pb in brown rice by 84.33% and Pb distribution in rice embryo, but also increased rice yield by 53.38% from that of the control. Further, unlike biochar treatment, RBL and lime treatments decreased the translocation of Pb in rice plants. The RBL treatment increased the proportion of Pb distributed in the cell wall and reduced the mobility of Pb in plant tissues. Thus, application of biochar and lime in combination is more effective than their individual application in reducing the availability of Pb in the soil and Pb accumulation in brown rice.

这项研究旨在通过盆栽试验研究稻草生物炭和石灰（RBL）对水稻中铅（Pb）污染土壤的修复和缓解Pb易位的影响。在本研究中，使用了从铅锌矿附近的农田，生物炭，石灰石粉和in稻（Oryza sativa L.）收集的铅污染土壤。实验处理包括：（1）对照（CK），（2）2.5％生物炭（RB1），（3）5％生物炭（RB2），（4）0.6％石灰（L1），（5）1.2％石灰（ L2），（6）2.5％生物炭+ 0.6％石灰（RBL1）和（7）2.5％生物炭+ 1.2％石灰（RBL2）。结果表明，用RBL处理比仅用生物炭或石灰处理能更有效地减少CaCl _2。通过增加土壤的pH值和土壤中的可溶性硫酸盐含量可提取土壤中的Pb含量。用RBL处理减少了水稻植株芽中Pb的积累，这主要归因于土壤中有效Pb浓度的降低。RBL2处理不仅使糙米中的Pb浓度降低了84.33％，水稻胚中的Pb分布也降低了，与对照相比，水稻的产量提高了53.38％。此外，与生物炭处理不同，RBL和石灰处理减少了水稻植株中Pb的转运。RBL处理增加了Pb在细胞壁中分布的比例，并降低了Pb在植物组织中的迁移率。因此，