摘要
采用同位素示踪技术研究了１２５Ｉ在模拟水稻田中的吸收和分配。结果表明，水稻能吸收１２５Ｉ，并可将吸收到的一半以上转运至地上部；水稻各部分１２５Ｉ的比活度大小顺序为根＞茎＞叶＞谷粒，谷粒中１２５Ｉ的积累量最低，约占全株的０１８％；田表水及表土中１２５Ｉ的比活度随时间而下降，到第６０天田表水中１２５Ｉ的比活度下降到只占引入量的０１９％；在收获期，水稻各部位中１２５Ｉ的比活度大小次序表现为根＞茎叶＞稻壳＞糙米。
he isotope tracer technique was used to study the absorption and distribution of 125I in the simulated paddy field.The results showed that 125I could be absorbed by rice and more than half of the absorbed 125I was transported to the shoot.The specific activity of 125I in each part of the rice was in order of: root>stem>leaf>grain.The accumulation of 125I in grain was the lowest (018% of the whole plant).The specific activity of 125I in paddy water and topsoil decreased with time.On the 60th day,the specific activity of 125I in paddy water reduced to 019% of the initial.In harvested rice plants, the specific activity of 125I in root,straw, husk and brown rice was 411387cpm/g,53880cpm/g,1193cpm/g and 61cpm/g,respectively.
出处
《核农学报》
CAS
CSCD
1998年第1期41-46,共6页
Journal of Nuclear Agricultural Sciences
