中文摘要：

放射性Sr是目前土壤环境放射性污染的重要污染物。文章以温室盆栽为实验研究方式,通过在栽培土壤中添加不同浓度的Sr,探讨Sr在土壤—大豆系统间的迁移特征。大豆盆栽种植56 d后收获并检测果实、叶片、茎和根系中的Sr含量。结果表明,Sr主要累积在大豆的叶器官中,经外源添加Sr处理的大豆各器官中迁移系数（TF）均大于土壤本底中Sr在大豆各器官中的TF值。经外源添加Sr处理的大豆各器官的富集率（CR）随Sr添加量的增加而增加。应用Tessier连续浸提法分析各处理土壤中Sr形态的变化,随着土壤中外源加入Sr含量的增加,可交换态Sr所占土壤中总Sr含量的比重逐渐增加,残渣态Sr所占土壤中总Sr含量的比重逐渐减少,大部分外源加入的Sr以可交换态存在,使得土壤中Sr的可移动性比例增加。大豆各器官中的Sr含量与其土壤中可交换态,碳酸盐结合态和铁锰氧化态的Sr呈显著正相关关系,与残渣态的Sr呈负相关关系。

英文摘要：

Radioactive strontium（Sr） is an important environmental pollutant in soil. In the present study,varied Sr concentrations were added to the soil and pot experiments were conducted to investigate Sr uptake of soybean [ Glycine max（L.）Merr.] in a green house. Sr concentrations in soybean pods,leaves,stems,and roots were determined after 56 d of cultivation. Results showed that Sr was concentrated in leaves. The transportation factor（TF） values of Sr treatments were higher in the background soil. The concentration ratio（CR） values of Sr treatments greatly increased as Sr was increasingly added to the soil. Tessier sequential extraction was performed on cultivated soil. A larger proportion of Sr was recovered in the exchangeable phase. As Sr concentration in the soil increased,the increasing proportion of the exchangeable phase and the decreasing proportion of the residual phase indicated that exogenous Sr was present in the exchangeable phase;thus,Sr exhibited a strong mobility. Significantly positive correlations were found between the concentrations in soybean organs and the exchangeable phase,bound to carbonates and to Fe-Mn oxide phases,and negative correlation with bound to organic matter phases.