把具有γ辐射的核素注入植物体内,然后检查这些核素在植物根系中的再分配情况,这是一种进行根型调查的方法。~(22)Na,~(42)K,~(75)As,~(86)Rb 和~(137)Cs 等核素都曾被用于这方面的研究。我们选用了~(75)Se,因为它能够在根的生物活性方面提供有价值的资料。从对植物的新陈代谢的研究中得知:亚硒酸盐溶合进氨基酸后,硒能够在氨基酸内代替硫。根系内示踪剂 Injecting radionuclide nuclides into plants and then examining the redistribution of these nuclides in plant roots is a method of conducting root-based surveys. ~ (22) Na, ~ (42) K, ~ (75) As, ~ (86) Rb and ~ (137) Cs have been used in this study. We chose ~ (75) Se for its ability to provide valuable information on the biological activity of the root. From the study on plant metabolism, selenium can replace sulfur in amino acids after selenite is dissolved into amino acids. Root tracer