Abstract

The transfer of zinc (natural stable Zn and radioactive tracer ⁶⁵Zn) to aqueous phase and its uptake by barley have been studied using a specially designed vegetation testbench comprising a lysimeter unit filled with coarse-textured soil and drainage and the vegetation vessels with aqueous barley culture. Although the zinc migration to soil aqueous phase and its uptake by plants are spatially separated, they are sequentially coupled. The patterns of Zn(⁶⁵Zn) distribution among different compounds (chemical fractions) in soil were determined using parallel and sequential fractionation procedures. The relative content of native (stable) Zn in labile and conventionally labile forms is 2.1–6.5-fold lower as compared with the relative content of radionuclide ⁶⁵Zn and, vice versa, 2.8–3.0-fold higher for conservative (fixed) fractions of the metal in soil. The dynamics of the following parameters were assessed: Zn concentration, ⁶⁵Zn specific activity, distribution and concentration factors of natural Zn and ⁶⁵Zn, and uptake and removal of the metal by plants. The enrichment factors of stable Zn, contained in sequentially extracted chemical fractions, with radioisotope ⁶⁵Zn, were determined, and the pool of the labile zinc compounds in the studied soil was evaluated.

中文翻译：

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植被测渗试验中使用 65Zn 对土壤中锌的不稳定性和生物有效性的研究

摘要

已经使用专门设计的植被测试台研究了锌（天然稳定的锌和放射性示踪剂⁶⁵ Zn）向水相的转移及其被大麦吸收文化。尽管锌向土壤水相的迁移和植物对其的吸收在空间上是分开的，但它们是顺序耦合的。使用平行和连续分级程序确定土壤中不同化合物（化学组分）之间的 Zn( ^{65 Zn) 分布模式。与放射性核素65}的相对含量相比，不稳定和常规不稳定形式的天然（稳定）锌的相对含量低 2.1-6.5 倍Zn，反之亦然，对于土壤中金属的保守（固定）部分，高 2.8-3.0 倍。评估了以下参数的动态：Zn 浓度、⁶⁵ Zn 比活性、天然 Zn 和⁶⁵ Zn 的分布和浓度因子，以及植物对金属的吸收和去除。^{用放射性同位素65} Zn 测定了依次提取的化学组分中稳定 Zn 的富集因子，并评估了研究土壤中的不稳定锌化合物库。