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本文按垂直自然带谱研究了暖温带地理景观中山地草甸土、山地棕壤、山地淋溶褐土和潮土中硒的分异特征。结果表明:(1)硒在土壤剖面上的分异,除受生物富集的影响外,淋溶和粘化作用强烈地制约着硒在剖面上的迁移;(2)不同机械组分中的硒含量以粘粒中最高,呈明显的粘粒>细粉粒>中粉粒>砂粒序列。因此,成土过程中,不同机械组分以及次生或伴生矿物的垂直运动和自然分选作用对土壤硒的地理分异具有非常重要的作用。(3)易于淋失的有机态或钙结合态的硒对所研究的土壤表层硒的贡献都大于50％。提出淋溶作用是我国低硒带形成的主要外营力。
In this paper, the vertical natural banding was used to study the selenium differentiation characteristics of meadow meadow soil, mountain brown soil, leached cinnamon soil and alluvial soil in warm temperate geographical landscape. The results showed that: (1) Separation of selenium in the soil profile, in addition to the impact of bioaccumulation, leaching and sticking strongly restrict the migration of selenium in the profile; (2) different mechanical components The content of selenium is the highest in the clay, showing the obvious clay> fine grain> medium grain> grit series. Therefore, during the process of soil formation, the vertical movement and natural separation of different mechanical components and secondary or associated minerals play an important role in the geographical differentiation of soil selenium. (3) The organic or calcium-bound selenium that is easily leached contributes more than 50% of the surface selenium of the soil studied. It is proposed that the leaching action is the main external force of the formation of low selenium in our country.