Identification of carbonate pedofeatures of different ages in modern chernozems
- Авторы: Kovda I.1, Morgun E.2, Lebedeva M.3, Oleinik S.4, Shishkov V.1
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Учреждения:
- Institute of Geography
- Lomonosov Moscow State University
- Dokuchaev Soil Science Institute
- Department of Geosciences
- Выпуск: Том 49, № 7 (2016)
- Страницы: 807-823
- Раздел: Mineralogy and Micromorphology of Soils
- URL: https://journals.rcsi.science/1064-2293/article/view/223448
- DOI: https://doi.org/10.1134/S106422931607005X
- ID: 223448
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Аннотация
Carbonate pedofeatures of three chernozemic soils developed from loesslike loams in the foreststeppe zone of Lipetsk oblast under fallow plot (Luvic Chernozem (Clayic, Pachic)) and under forest (Calcic Chernozem (Clayic, Pachic)) and in the steppe zone of Dnepropetrovsk oblast (Calcic Chernozem (Episiltic, Endoclayic, Pachic)) were studied in the field and laboratory with the use of a set of methods, including the radiocarbon method, mass spectrometry, and micro- and submicromorphology. The morphological diversity of carbonate pedofeatures in these soils was represented by carbonate veins, coatings, disperse carbonates (carbonate impregnations), soft masses (beloglazka), and concretions. In the forest-steppe soils, disperse carbonates and soft masses were absent. The radiocarbon age of carbonate pedofeatures in the forest-steppe soils varied within a relatively narrow range of 3–4.3 ka cal BP with a tendency for a younger age of carbonate concretions subjected to destruction (geodes). In the steppe chernozem, this range was larger, and the 14C ages of different forms of carbonate pedofeatures were different. Thus, soft masses (beloglazka) had the age of 5.5–6 ka cal BP; disperse carbonates, 17.5–18.5 ka cal BP; and hard carbonate concretions, 26–27 ka cal BP. Data on δ13C demonstrated that the isotopic composition of carbon in virtually all the “nonlabile” carbonate pedofeatures does not correspond to the isotopic composition of carbon of the modern soil organic matter. It was shown that the studied chernozemic soils are polygenetic formations containing carbonate pedofeatures of different ages: (a) recent (currently growing), (b) relict, and (c) inherited pedofeatures. The latter group represents complex pedofeatures that include ancient fragments integrated in younger pedofeatures, e.g., the Holocene soft carbonate nodules with inclusions of fragments of the ancient microcodium.
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Об авторах
I. Kovda
Institute of Geography
Автор, ответственный за переписку.
Email: ikovda@mail.ru
Россия, per. Staromonetnyi 29, Moscow, 119017
E. Morgun
Lomonosov Moscow State University
Email: ikovda@mail.ru
Россия, Leninskie gory, Moscow, 119991
M. Lebedeva
Dokuchaev Soil Science Institute
Email: ikovda@mail.ru
Россия, per. Pyzhevskii 7, Moscow, 119017
S. Oleinik
Department of Geosciences
Email: ikovda@mail.ru
США, Guyot Hall, Princeton, NJ, 08544-1003
V. Shishkov
Institute of Geography
Email: ikovda@mail.ru
Россия, per. Staromonetnyi 29, Moscow, 119017