坡缕石钝化菜地土壤镉效果研究

Study on the Cadmium Passivation Effect of Palygorskite on Vegetable Field Soil

本研究通过盆栽试验,研究了坡缕石对土壤pH值、镉(Cd)生物有效性和油菜产量的影响。结果表明,土壤中施用坡缕石能显著降低油菜对有效镉的吸收率。加入坡缕石钝化剂后的土壤,植物体内镉含量降幅最大程度达到69.48%,最低降幅亦达到了14.59%。油菜的生物量增加,地下部最大增幅为36.17%,地上部最大增幅为14.02%,土壤中有效镉的含量的降幅最大达20.80%,最小降幅也达到2.22%。随着坡缕石浓度的提高,土壤pH值略微上升,升幅在0.84%~1.20%之间。钝化剂使土壤中有效镉含量显著降低,含量为20 g/kg土壤时效果最为显著。

This study investigated the effects of palygorskite on soil pH,cadmium(Cd)bioavailability,and rapeseed yield through pot experiments.The results indicate that the application of palygorskite in soil can significantly reduce the absorption rate of available cadmium by rapeseed.After adding palygorskite passivator to the soil,the maximum decrease in cadmium content in plants reached 69.48%,and the minimum decrease also reached 14.59%.The biomass of rapeseed increased,with a maximum increase of 36.17%in the underground part and 14.02%in the aboveground part.The maximum decrease in available cadmium content in the soil was 20.80%,and the minimum decrease was 2.22%.As the concentration of palygorskite increases,the soil pH value slightly rises,with an increase ranging from 0.84%to 1.20%.Passivation agents significantly reduce the effective cadmium content in soil,with the most significant effect observed at a concentration of 20 g/kg soil.