137 Cs在土壤中的污染行为与钾盐的防治效果

本研究结果表明 ,在污染水平相同的情况下 ,不同土壤对春小麦吸收137Cs有很大影响 ,植株中137Cs的比活度相差几十倍。在同一种土壤、不同污染水平下 ,春小麦对137Cs的吸收与土壤中137Cs的污染水平呈正相关。在137Cs污染的土壤上施用钾盐可以降低春小麦植株对137Cs的吸收。防治效果与钾盐施用量有关 ,本试验结果为土壤阳离子代换量 1 / 3 0的量施用效果最好 ,使植株中的137Cs比活度降低 84 74%～88 89% ,与不施钾盐的对照组的差异十分显著

BEHAVIOR OF ~(137)Cs IN SOILS AND POTASSIUM COUNTERMEASURES

Using 137 Cs tracer technique, a pot experiment was carried out emphasizing on the countermeasures of potassium salt and the behavior of 137 Cs in Dayawan soil, Qinshan soil and Beijing soil. The result show that the absorption of 137 Cs by spring wheat varied with the soil type under a same contamination level. The absorption of 137 Cs is in the order of Dayawan soil>Qinshan soil>Beijing soil, so that the specific activity of 137 Cs in plant exist the significant differences. The absorption of 137 Cs by spring wheat related with the contamination level possitively under the different contamination level even in the same soil. The absorption of 137 Cs from the soils by wheat reduced remarkably using potassium salt, of which the most effectiveness appeared in Qinshan soil. Comparing with the control the specific activity of 137 Cs in wheat decreased 84 74%～88 89% using the potassium as 1/30 of the exchangeable cation of the soil and the statistical result show a significant differences.