土壤与作物2025，Vol.14Issue(2)：235-245,11.DOI:10.11689/sc.2024012001
土壤调理剂对酸性土壤中铅赋存形态及其钝化效果的影响
Effects of soil amendment agents on lead speciation and passivation in weak acid soils
摘要
Abstract
To investigate the influence of different soil amendments on the fractionation and passivation of lead(Pb)in acidic soils,a pot experiment was conducted using Pb-contaminated weak acid soil.Five amendments,namely lime powder,dolomite powder,oyster shell powder,peat soil,and silicate-calcium-magnesium-potassium fertilizer,were applied to the soil.The changes in the content of five Pb fractions(water-soluble,weakly acid-extractable,reducible,oxidizable,and residual)and soil pH were monitored 60 d after the application of amendments,and their passivation effects on Pb pollution were analysed.The dominant Pb fractions in the soil are reducible and residual Pb,followed by weak acid-extractable,oxidizable,and water-soluble Pb.At 60 d after the experiment,the application of lime powder,dolomite powder,oyster shell powder,peat soil,and silicate-calcium-magnesium-potassium fertilizer increases the soil pH by 1.81,1.49,1.17,0.48,and 0.60 units,respectively(P<0.05).The distribution coefficient of water-soluble Pb is decreased by 92.5％、92.5％、90.0％、57.5％and 37.5％,while weak acid-extractable Pb is decreased by 87.2％、73.7％、77.3％、26.7％and 44.9％,respectively.Oxidizable Pb is increased by 7.63％、7.90％、17.2％、40.1％and 31.9％,respectively(P<0.05).Except for peat soil treatment,reducible Pb and residual Pb are all significantly increased in all treatments compared with the control.A parabolic relationship is found between soil pH and the passivation effect,with a correlation coefficient(r)of 0.973 5(P<0.01).The amendments effectively reduce the bioavailable Pb fractions and increase the potentially available and unavailable Pb fractions in the soil.The passivation effect on Pb pollution is 87.2％,73.6％,77.3％,26.7％,and 44.9％for lime powder,dolomite powder,oyster shell powder,peat soil,and silicate-calcium-magnesium-potassium fertilizer,respectively.The application of these five amendments at suitable application rates is an effective and feasible approach to the safe utilization and remediation of Pb-contaminated acid soils.It is worthy of demonstration and extension after further validation through additional field trials.关键词
土壤调理剂/酸性土壤/铅/赋存形态/生物有效性/钝化效果Key words
soil amendments/acid soil/lead/speciation/bioavailability/passivation effect分类
农业科技引用本文复制引用
刘辽源..土壤调理剂对酸性土壤中铅赋存形态及其钝化效果的影响[J].土壤与作物,2025,14(2):235-245,11.基金项目
2021年福建省生态农业专项资金项目"华安县受污染耕地重金属联合阻控技术研究及示范区建设"(闽财农指[2020]105号). （闽财农指[2020]105号）
