A Study of the Zinc Lability and Bioavailability in Soil Using 65Zn in a Vegetation Lysimetric Experiment
2022
Anisimov, V. S. | Anisimova, L. N. | Sanzharov, A. I. | Frigidov, R. A. | Dikarev, D. V. | Korneev, Yu. N. | Korovin, S. V. | Sarukhanov, A. V. | Thomson, A. V.
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.
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