Department of Rangeland and Watershed Management, Faculty of Agriculture, Fasa University, Fasa, Islamic Republic of Iran.
Environ Manage. 2020 Dec;66(6):1133-1141. doi: 10.1007/s00267-020-01371-9. Epub 2020 Oct 17.
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 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.
土壤重金属污染是一个严重的环境问题，特别是在盐碱和苏打土壤中，了解金属的不同形态对于预测其在土壤中的迁移性和生物有效性非常有用。添加有机改良剂作为修复金属的一种重要技术，最近得到了广泛关注。因此，本研究通过连续提取法的培养实验，评估了甘蔗渣衍生生物炭对盐碱、苏打盐碱和正常土壤中镉（Cd）形态的影响。处理包括生物炭（甘蔗渣 0、2 和 4wt%）和 50mgCdkg 的添加，每个处理重复 3 次。在所有研究的土壤中，添加 2%和 4%的生物炭时，有机质形态是 Cd 的主要形态。生物炭对正常和苏打土壤中可交换态 Cd 没有显著影响。然而，在盐碱和苏打盐碱土壤中添加 2%和 4%的生物炭增加了可交换态 Cd 的浓度，这可能是由于生物炭具有高盐吸附能力，减轻了盐在土壤溶液中的负面影响。研究土壤中 Cd 的迁移因子（MF）较高（20-50%）。MF 值随生物炭用量的增加而降低。根据减少的分配指数，Cd 分配在所有形态中。根据这些结果，生物炭可以减轻这些土壤中 Cd 污染的影响。
