改良剂豆渣处理土壤对玉米吸收天然放射性核素的影响

Effect of Soybean Dregs Treated Soil on Uptaking of Natural Radionuclides by Corn

利用改良剂豆渣处理土壤,分析不同处理对土壤基本性质、玉米生物量以及238U、226Ra、232Th和40K的生物富集、迁移的影响。盆栽试验结果表明:添加豆渣可显著降低土壤pH值;土壤pH值、有机质含量以及阳离子交换量和玉米生物量之间的变化对40K的生物有效性、富集系数及迁移系数有显著影响,而对238U、226Ra和232Th的影响不显著;玉米地上部分40K的迁移系数和富集系数与238U、226Ra和232Th有显著差异;除238U外,其他3种核素在地上部分的富集系数与迁移系数呈极显著线性相关。

Soybean was used as soil conditioner with different treatments, and the influence of different treatments on soil basic properties, corn biomass, and the effects of bioconcentration and migration on 238U, 226Ra, 232Th and 40K were analyzed. Pot experiment results showed that adding soybean dregs could significantly decrease the pH value of soil. The changes of soil pH value, organic matter content and cation exchange capacity with the corn biomass had significant influences on the bioavailability, bioconcentration factor （BCF） and transfer factor （TF） of 40K, but had insignificant influences on 238U, 226Ra and 232Th. Except for 238U, there was extremely significant linear correlation between the BCF and TF to the aboveground parts of corn for the other three nuclides.