Академическое издательство «Гео»

Keywords: soil formation, residual soil, morphological structure, clay-silt content, spore-pollen spectra.


Polygenetic traits in burozems of the coast and Island zone in southern Primorskii krai

B.F. Pshenichnikov*, M.S. Lyashchevskaya**, N.F. Pshenichnikova**, E.G. Zubakho*

*Far Eastern Federal University,
ul. Sukhanova, 8, Vladivostok, 690000, Russia, bikinbf@mail.ru, Geka01@mail.ru
**Pacific Institute of Geography, Far Eastern Branch, Russian Academy of Sciences,
ul. Radio, 7, 690041, Russia, lyshevskay@mail.ru, n.f.p@mail.ru

This research focuses on polygenetic burozem formation conditions, physicochemical properties, mechanical and total chemical composition, and spore-pollen spectra of horizons. It was found that on the islands and the coast of southern Primorskii krai there occur burozems with a simple polygenetic profile on red and yellow residual soils which combines modern (pedogenetic) and relict (lithogenetic) signs of soil formation processes. It is shown that the polygeneticity of the profile implies a dramatic change in color of the soil mass in the lower part of the profile having an inherited coloring of relict parent rocks: bright brown and yellowish-brown hues in burozems occurring yellow residua and pinkish in burozems on red residua. A polygeneticity of the profile of the burozems under consideration was identified from the degree of stoniness manifesting itself in increased content of detrital-stony material in the illuvial part of the profile and its absence in the lower part, which gives evidence of the intensity of deluvial processes at the time of formation of separate genetic horizons. It is shown that horizon C (parent rock) and adjacent transitional horizon ВМС differ from the overlying part of the profile by the highest silt and clay content. An increase in content of aluminum and iron oxides in the soil mass of the lower part of the profile was observed, which indicates its allitization. We studied the intraprofile variation in spore-pollen spectra characterizing the succession of plants and the climatic conditions during the formation of genetic horizons of polygenetic burozems thereby providing insight into the causes for the diversity in their morphological structure and the origin of the polygeneticity. Data of radiocarbon analysis were used to determine the formation time of genetic horizons of the burozems considered in this study.

Keywords: soil formation, residual soil, morphological structure, clay-silt content, spore-pollen spectra.

DOI: 10.21782/GiPR0206-1619-2018-2(120-128)