磷、镉交互作用对烟草生长及吸收积累磷、镉的影响

采用盆栽实验研究石灰性土壤中磷、镉交互作用对烟草生长的影响,结果表明,磷的添加可减轻镉对烟草的危害。随着向土壤中添加磷浓度的增加,烟草生物量呈增加趋势。而当磷浓度为150mg kg-1时烟草生物量显著增加,地上部分变化比地下部分明显;而烟草中镉的含量呈先下降再增加的趋势。当镉浓度相同条件下,随着向土壤中添加磷浓度的增加,烟草中的镉含量呈现先下降再增加的趋势,高浓度镉尤为明显,在镉浓度为40mg kg-1时最为明显。研究还发现,同一磷浓度下,随着镉浓度的增加植株中磷含量呈逐渐下降趋势,此外,植株中镉含量、磷与土壤环境中磷、镉含量浓度呈显著正相关。

Influence of P and Cd Interaction on Their Accumulation in Tobacco and Tobacco Growth

The effects of phosphorus and cadmium interaction on the growth of tobacco in calcareous soils by pot trial0]s was studied.The results showed that P addition could reduce the toxicity of Cd to tobacco growth.The tobacco biomass increased with the increase of P concentration in the soil.When P concentration was at the level of 150mg kg-1,the biomass of tobacco increased significantly.However,the above-ground biomass change was more than the underground biomass.The Cd content in tobacco increased at first and then decreased with the increase of P concentration in the soil,When Cd concentration was kept at the same level,the Cd content in tobacco had the same changing trend.The results also showed that when P concentration was same in soil,the P content in plant decreased with the increase of Cd concentration.P and Cd concentration in plant had a positive correlation with the P and Cd concentration in soil.