Soil contamination by heavy metals is becoming a serious environmental problem especially in saline and sodic soils and information on different fractions of metals is useful to predict their mobility and availability in soil. Addition of organic amendments, as an important technique to remediation of metals has been considered recently. Therefore, the effect of sugarcane bagasse-derived biochar on cadmium (Cd) fractions in saline, sodic, saline-sodic and normal soils were evaluated through an incubation experiment using sequential extraction. Treatments included biochar (0, 2, and 4 wt %) of sugarcane bagasse and 50 mg Cd kg−1 with three replications. In all studied soils with 2 and 4% biochar application, the organic matter fraction was the dominant form of Cd. Biochar had no significant influence on exchangeable Cd in normal and sodic soils. Whereas, application of 2 and 4% biochar increased exchangeable Cd concentration in saline and saline-sodic soils probably due to high capacity of biochar to sorb salts that mitigate the negative effects of salts in soil solution. The mobility factor (MF) of Cd in studied soils was high (20–50%). The MF value decreased with the increase of biochar dosage. According to reduced partition index, Cd was partitioned in all fractions. Based on these results, biochar can mitigate the effect of Cd pollution in these soils.

中文翻译：

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生物炭对部分受污染盐碱土中镉组分的影响

重金属对土壤的污染正在成为一个严重的环境问题，尤其是在盐碱土和盐碱土中，有关金属不同部分的信息可用于预测它们在土壤中的流动性和可用性。最近考虑添加有机添加物，作为修复金属的重要技术。因此，甘蔗渣衍生的生物炭对盐渍土、钠盐、盐渍土和正常土壤中镉 (Cd) 组分的影响通过使用顺序提取的孵育实验进行评估。处理包括生物炭（0、2 和 4 wt%）甘蔗渣和 50 mg Cd kg-1，重复三次。在施用 2% 和 4% 生物炭的所有研究土壤中，有机质部分是 Cd 的主要形式。生物炭对正常土壤和含钠土壤中的可交换 Cd 没有显着影响。然而，施用 2% 和 4% 的生物炭增加了盐渍土和盐碱地土壤中的可交换 Cd 浓度，这可能是由于生物炭吸附盐分的能力强，从而减轻了土壤溶液中盐分的负面影响。所研究土壤中 Cd 的迁移因子 (MF) 很高 (20-50%)。MF 值随着生物炭用量的增加而降低。根据减少的分配指数，Cd被分配在所有馏分中。基于这些结果，生物炭可以减轻这些土壤中 Cd 污染的影响。MF 值随着生物炭用量的增加而降低。根据减少的分配指数，Cd被分配在所有馏分中。基于这些结果，生物炭可以减轻这些土壤中 Cd 污染的影响。MF 值随着生物炭用量的增加而降低。根据减少的分配指数，Cd被分配在所有馏分中。基于这些结果，生物炭可以减轻这些土壤中 Cd 污染的影响。