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应用~(75)Se 示踪法探讨春小麦对不同形态 Se 的吸收、运转和分配规律。结果表明,春小麦对 Na_2SeO_4[Se(Ⅵ)]的吸收、运转比 Na_2SeO_3[Se(Ⅳ)]快,土施时 Se(Ⅳ)和 Se(Ⅵ)在小麦植株中的分配规律相似,施用方法对 Se 的分配有很大影响。春小麦对 Se(Ⅵ)的利用率比 Se(Ⅳ)高,土施时两者相差8倍,在喷施情况下两者相差2.4倍。施用不同形态的 Se 还影响植株中 Se 的来源。在施 Se(Ⅵ)时,植株中54%～86%的 Se 来自外源 Se,而在施用 Se(Ⅳ)时,则植株中 Se 主要来源于土壤。
The application of ~ (75) Se tracer method to investigate the absorption, transport and distribution of different forms of Se in spring wheat. The results showed that the uptake and transport of Na_2SeO_4 [Se (Ⅵ)] in spring wheat was faster than that of Na_2SeO_3 [Se (Ⅳ)], and the distribution of Se (Ⅳ) and Se (Ⅵ) was similar in wheat plants. The distribution of Se has a big impact. The utilization rate of Se (¢ ö) in spring wheat was higher than that of Se (¢ ö), with a difference of 8 times in soil application and 2.4 times in spraying condition. The application of different forms of Se also affects the source of Se in the plant. When Se (Ⅵ) was applied, 54% ~ 86% Se of the plants came from exogenous Se, while in the application of Se (Ⅳ), Se of the plants mainly came from the soil.