Effect of Covering with New Soil on Reducing the Accumulation of Radio-strontium in Plant
客土覆盖对降低放射性锶在作物中积累的效应

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.