客土覆盖对降低放射性锶在作物中积累的效应

采用模拟污染物的同位素示踪技术研究了客土覆盖对降低大豆和白菜(尤其是作物的可食用部分)中⁸⁹Sr积累的效应.结果表明客土覆盖能有效降低大豆和后茬白菜对⁸⁹Sr的吸收和积累,当客土覆盖深度为9cm时,豆籽、豆壳、豆秸和豆根中⁸⁹Sr比活度分别下降了82.8%、56.4%、38.7%和66.5%,后茬白菜下降了68.8%;作物中吸收积累的⁸⁹Sr比活度随客土覆盖深度的增加而下降,实验数据线性回归分析表明两者间呈显著线性负相

Effect of Covering with New Soil on Reducing the Accumulation of Radio-strontium in Plant

Effects of covering with new soil on reducing the accumulation of ⁸⁹Sr by soybean and Chinese cabbage (especially in the edible part of crop) were studied on simulated pollutants by using the isotope-racer techniques. The results showed that the absorption and accumulation of ⁸⁹Sr in the soybean and Chinese cabbage could be decreased significantly by covering soil polluted ⁸⁹Sr with new soil. The specific activity of ⁸⁹Sr in bean seed, bean hull, bean straw, bean root and Chinese cabbage were reduced by 82.8%, 56.4%, 38.7%, 66.5%and 68.8% respectively when the depth of covering with new soil reached 9cm. The specific activity of absorption and accumulation ⁸⁹Sr in the crop decreased with depth of the new soil profile. The specific activity of ⁸⁹Sr in the crop follows a negative linear relation with depth of the new soil profile by analyzing the experiment data with linear regression method.