Abstract

We have studied geochemical features of organo-accumulative soils (Eutric Regosols (Loamic, Ochric)), Cambic Someric Phaeozems (Loamic)) widely spread in the soil cover of subtaiga and subtaiga-forest-steppe light coniferous forests and forming the lower boundary of the forest zone in the mountains of Northern Mongolia. Data on the microelement composition of soil-forming rocks are given; the paragenetic association of trace elements in them is composed of Pb, Cu, Zn, Co, V, Cr, Ni, Mn, Mo, Ba, Sr, Zr, and B. The residual and redeposited weathering crusts of igneous rocks are enriched with Zn, Cr, Mo, and B as compared to the mean content of these elements in the lithosphere, but they contain less Pb, Co, Mn, Ba, Sr, and Zr. The residual and re-deposited weathering crusts of calcareous rocks are enriched in Pb, Cu, Zn, V, Cr, Sr, and B, and are impoverished in Co, Ni, Mn, Mo, Ba, and Zr. The morphological, physicochemical and chemical properties of soils, as well as the content and radial distribution of trace elements in soils are discussed. The data obtained testify to the accumulation of most trace elements in the surface organic and humus-accumulative soil horizons. This is associated with the heterogeneity of soil-forming rocks and with the effect of soil processes, which cause the accumulative redistribution of elements and their deposition at organic-sorption and carbonate geochemical barriers. It is shown that the studied soils differ not only in the absolute contents of trace elements, participating in the biological cycle, but also in the intensity of their involvement in biogenic migration.

中文翻译：

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蒙古北部苏针叶林和苏针叶林-森林草原轻针叶林有机积累土的地球化学特征

摘要

我们研究了广泛分布在亚针叶林和亚针叶林-森林-草原轻质针叶林土壤覆盖层中并形成蒙古北部山区的森林地带。给出了成土岩石的微量元素组成数据；其中微量元素的共生组合由Pb、Cu、Zn、Co、V、Cr、Ni、Mn、Mo、Ba、Sr、Zr、B组成。火成岩的残余和再沉积风化壳富集了Zn、Cr、Mo 和 B 与岩石圈中这些元素的平均含量相比，但它们含有较少的 Pb、Co、Mn、Ba、Sr 和 Zr。钙质岩的残余和再沉积风化壳富集Pb、Cu、Zn、V、Cr、Sr和B，贫乏Co、Ni、Mn、Mo、Ba和Zr。讨论了土壤的形态、理化和化学性质，以及土壤中微量元素的含量和径向分布。获得的数据证明大多数微量元素在表面有机和腐殖质积累的土壤层中积累。这与成土岩石的非均质性和土壤过程的影响有关，土壤过程导致元素的累积重新分布及其在有机吸附和碳酸盐地球化学屏障处的沉积。结果表明，所研究的土壤不仅参与生物循环的微量元素的绝对含量不同，而且参与生物迁移的强度也不同。