低硒土壤中75Se的形态转化
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TRANSFORMATION OF THE 75Se IN LOW-Se SOIL
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    摘要:

    75SeO2水溶液分别按0.131ppm和1.631ppm比例处理暗棕色森林土。用这种土壤盆栽的小麦含Se分别为0.023ppm和0.493ppm。小麦收获之后,对土壤残留的75Se用不同的提取剂连续进行化学分级,75Se的各种形态按其占土壤总Se的百分比大小排序为:同位素交换态Se>NH4OH可提态Se>HNO3可提态Se>HCl可提态硒>水溶态Se>K2SO4可提态硒。土壤残留75Se主要以NaHSeO3同位素交换态存在,其量占土壤总硒28%,NH4OH可提态Se次之,占20%;水溶态Se较少,仅6-7%。以SeO3-2形式加入土壤的75Se被土壤紧密吸附。

    Abstract:

    Dark brown forest soil was treated with radioactive aqueous solution of 75SeO3 at rate of 0.131 ppm and 1.631 ppm.Wheat was planted on the soil contained Se of 0.023 ppm and 0.493 ppm respectely.After the wheat being havested,residual 75Se in the soil was fractioned by various extractants.Various forms 75Se in the soil were in the order of isotopically exchangeable Se>that extracted by NH4OH>extracted by HCl>that water soluble>that extracted by K2SO4·75Se in the soil was present mainly as the form exchanged by NaHSeO3.This fraction of Se constituted 28% of the total Se in soil,that extracted by NH,OH 20%;that soluble in water,6-7%.Most of 75Se being in the form of SeO32- added to the soil was quickly adsorbed by the soil.The results of the experiments also indicated that more than 90% of soluble Se was transformed into insoluble forms including organic Se and inorganic Se in the form of the SeO32- In addition,the SeO32- may also be reduced to Se0 and Selenides.Thus the availability of Se for plants was reduced.Content of Se in wheat have a directly correlated to that in the soil.It is suggested that to raise soluble Se in the soil is an important practice for increasing Se in wheat.

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李书鼎,张少兰.低硒土壤中75Se的形态转化[J].土壤学报,1990,27(3):280-285. Li Shuding, Zhang Shaolan. TRANSFORMATION OF THE 75Se IN LOW-Se SOIL[J]. Acta Pedologica Sinica,1990,27(3):280-285.

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  • 在线发布日期: 2013-02-25
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