Coatings in cryoaridic soils and other records of landscape and climate changes in the Ak-Khol Lake basin (Tyva)

Бронникова, М. А.; Konoplianikova, Yu. V.; Агатова, А. Р.; Zazovskaya, E. P.; Лебедева, М. П.; Turova, I. P.; Непоп, Р. К.; Shorkunov, I. G.; Cherkinsky, Alexander

doi:10.1134/s1064229317020016

Cited by 19 publications

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“…An absolute chronology for most of the sections presented in the paper have been discussed earlier in detail (Agatova et al 2016;Bronnikova et al 2017;Bronnikova et al 2018). As based on calibration intervals of 14C dates obtained for buried humus horizons (11 buried soils in 6 studied soilsedimentary sequences, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Paleoenvironmental changes in the Russian Altai in the end of the Late Pleistocene and Holocene have been studied using different proxy records and indicators, such as pollen, diatoms, and chironomids in lake sediments, landforms and lithostratigraphy of glacial, lacustrine, and fluvial deposits (Butvilovskij 1993;Rudoy and Baker 1993;Westover et al 2006;Blyakharchuk et al 2007;Ilyashuk and Ilyashuk 2007;Carling et al 2011;Nazarov et al 2012;Agatova et al 2012, 2015 andmany others). At the same time research on Holocene paleosol records of the region are few in number (Dergacheva et al 2006;Dergacheva et al 2007;Agatova et al 2016;Bronnikova et al 2017Bronnikova et al , 2018 As far as the Altai is the ultracontinental mountain area with strongly differentiated climatic and landscape conditions, environmental changes here are not only time-, but also strongly space-dependent. Specific of soil body as a recording system is recording the information about surrounding local environment in situ, unlike sedimentary systems keeping generalized environmental information on the area of their sedimentation basins.…”

Section: Introductionmentioning

confidence: 99%

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Holocene Environmental Change in South-East Altai Evidenced by Soil Record

Бронникова

Konoplianikova

Агатова

et al. 2019

Geogr. environ. sustain.

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The soils of Russian Altai highlands were used as a paleoenvironmental archive, as a source of dating material, and as a chronostratigraphic marker to describe Holocene environmental change in the studied area. Based on calibration intervals of 14C dates obtained for buried humus horizons (11 buried soils in 6 studied soil-sedimentary sequences) and some dates from pendants of contemporary soils, following stages of pedogenesis were recorded in studied soil-sedimentary systems and surface soils: 6.4 – 11.5 ky cal BP; about 4.9-5.3 cal BP; 2.5-3.8 cal BP; 0.6 – 1.2 cal BP. All studied surface soils in the basins nowadays develop in cold, ultra-continental water deficit conditions: Skeletic Kastanozems Cambic, Skeletic Cambisols Protocalcic, Skeletic Cambic Calcisol Yermic. The most extreme conditions of soil formation within Holocene were within the last 1-2 kyr. All buried soils were formed in better conditions, more balanced in water, with higher biological activity, mostly within steppe or forest-steppe landscapes. Cryogenic features had been insisting all over the Holocene till nowadays. Water demandant cryogenic features are met in buried soils up to the age of 1-2 ky cal BP. In the last millennia cryogenic processes are suppressed, water demandant features gave way to those which can be formed in contemporary water deficit conditions: simple fissures, frost sorting, and shattering. At lower levels (Kuraj basin) more or less arid cold steppe conditions insisted within the most part of Holocene. Initial stages of soil formation were often ground water affected, or at least shortly waterlogged. At the highest positions humid and relatively warm Early Holocene stage of forest pedogenesis is recorded for the beginning of Holocene, and a Late Holocene (last 3-4 kyr) cold humid phase, presumably under mountain tundra and/or alpines. Microsedimentary intra-soil record in carbonatehumus pendants imprints fine fluctuations of soil water regime at initial stages of soil formation, controlled by local topography, and climatic changes in the second half of Holocene. General trends of environmental changes in the region recorded in soil and soil sedimentary systems are in well correspondence with other records of paleonvironment.

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Section: Resultsmentioning

confidence: 99%