【摘要】 [目的]研究生物质炭对不同质地镉污染土壤理化性质及有效镉的影响。[方法]按照不同比例配置成砂土、壤土及黏土3种质地的镉污染土壤,通过添加不同比例的生物质炭,模拟研究不同添加量生物质炭对不同质地镉污染土壤pH、EC、有机质、含水率及有效镉含量的影响。[结果]生物质炭尽管提高了不同质地土壤pH,但是没有显著性影响;土壤EC值、有机质含量和含水率均随生物质炭添加量的增加而显著增加。当生物质炭添加量低于4%时,土壤有效镉随着生物质炭添加量的增加呈显著降低,进一步提高生物质炭添加量时土壤有效镉含量变化不明显。和对照相比,当土壤中生物质炭的添加量为2%、4%、8%时,砂土有效镉分别减少2.09%、7.94%、14.50%,壤土分别减少24.00%、32.60%、35.00%;黏土分别减少41.80%、58.80%、63.20%。[结论]该研究为生物质炭在不同质地镉污染土壤中的应用提供理论依据。更多还原

【Abstract】 [Objective] This study was to explore the effects of biochar on soil physical and chemical properties of cadmium contaminated soils and the effective cadmium. [Method] Three types of cadmium contaminated soils(sandy, loam and clay soils) were arranged in different proportions. By adding different proportions of biochar, change of pH, EC, organic matter and water content and effective cadmium content in three types of cadmium contaminated soils were studied in this experiment. [Result]pH increased with increasing biochar content,but biochar had no significant effect on soil pH value.The soil EC, organic matter content and water content increased significantly with increasing biochar content. When the amount of biochar was less than 4%, the soil effective cadmium decreased significantly with increasing biochar. However, change of available cadmium content in soil was not obvious when the amount of biochar was further increased. Compared with the control, when the amount of biomass carbon added in the soil was 2%, 4%, and 8%, the effective cadmium in sandy soil decreased by 2.09%, 7.94%, 14.50%, the loam soil decreased 24.00%, 32.60% and 35.00%, and the clay decreased 41.80%, 58.80% and 63.20% respectively. [Conclusion] This study can provide a theoretical basis for the application of biochar in heterogeneous cadmium contaminated soil.更多还原