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Clay-Salt Formations in Baer Mound Soils (Caspian lowland, Russia)статья
- Авторы: Galina Kharitonova, Dembovetsky A., Shein E., Milanovsky E., Tygai Z., Konovalova N., Kharitonov E.
- Сборник: The Proceedings of the International Congress on “Soil Science in International Year of Soils”. 19-23 October, 2015. Sochi, RUSSIA Article book
- Год издания: 2015
- Место издания: Москва ООО "Буки Веди"
- Первая страница: 199
- Последняя страница: 202
- Аннотация: As to clay-salt aggregation of the soil mass, the SEM analysis made it possible to establish the participation of clay-salt assemblages in aggregation of the solid phase of the study soils. The type of clay-salt assemblages (coatings and/or microaggregates) depends on the silt content in soils. Given the low content of the silt (prof. B), clay-salt coatings are formed on the surface of quartz grains. The coating diameter reaches 200 ����m, which corresponds to the size of the dominant fraction of particle size distribution. The coatings detected in the Ad upper horizon are compositionally ferruginous-clay, in hor. B1 and hor. Bs – calcitic. The formation of clay-calcitic coatings on the quartz grains was registered in profile A too. Given the high content of silt particles (prof. S and A), mainly clay-salt microaggregates are formed. For example, solonchak is characterized by the formation of clay-salt microaggregates with NaCl participation, the biggest of which (up to 70 ����m) were registered in the upper part of hor. A. In the saline hor. Bs calcitic tabularly packed clay-salt microaggregates were diagnosed. In the subsalt horizon B2 clay microaggregates are formed with participation of vitreous rounded assemblages with joint participation of sodium and magnesium sulfates. In the lower part of prof. A mainly dolomitic microaggregates up to 80 ����m in hor. BC were diagnosed. In prof. B in the saline horizon Bs with high gypsum content, microaggregates consist of gypsum tabular microcrystals covered with a clay coating. Their packing in the microaggregates is “face-to-face”. Thus, salts in the soils of Baer mound landscapes form individual crystals, formations of joint crystallization, and clay-salt coatings, microaggregates, and quasicrystals. The type of clay-salt formations (coatings and microaggregates) is conditioned by the silt content in soil. Particle packing, the size and shape of microaggregates depend on the content and properties of salts participating in their formation. The preservation and stability of Baer mound soils are related to the formation of clay-salt microaggregates and coatings.
- Добавил в систему: Милановский Евгений Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Kharitonova_Shein_Dembovetsky_Milanovsky.pdf | 43,0 КБ | 18 июня 2016 [milanovskiy] |