Podzol development on different aged coastal bars of Lake Ladoga
The result of studies of soil formation on different aged coastal bars in the transgression zone of Lake Ladoga in the Nizhnesvirsky Nature Reserve. Investigation of the data on soil chronoseries, located on four Ladoga coastal bars of different ages.
| Рубрика | Биология и естествознание |
| Вид | статья |
| Язык | английский |
| Дата добавления | 09.10.2020 |
| Размер файла | 871,7 K |
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The molecular composition of HAs is also similar to HAs isolated from the boreal zone, the prevalence of the alkyl zone is noted, which is associated with a low degree of humification of the organic material [35-36, 47-48, 65-66]. Depending on the age, the molecular composition of the HAs from Podzol changes; more mature soils contain more aromatic fragments. In younger soils, the content of aromatic fragments decreases, while in the youngest studied Podzol, the content of aromatic fragments increases again. Such dynamics can be associated with precursors of humification, composition of plant residues, and hydrophobicity degree.
Conclusions
As a result of the study of the soil chronoseries of transgression bars, it was determined that all soils are of the Podzol group with varying degrees of profile development. The youngest soils (70±25 years BP) are characterized by a thin profile with signs of podzolic horizon (Entic Podzols). As the thickness of the podzolic horizon increases, a powerful horizon with signs of Stagnic appears and anaerobic conditions near the entry of groundwater form. All investigated area is composed of sediments of Lake Ladoga and is well drained and aerated, the type of texture class is sandy, loamy sand and sandy loam. The formation of Podzols in waterlogged conditions leads to the leaching of organic carbon into Lake Ladoga, this is due to the light texture class and a high hydrogen content in HAs.
The content of carbon and nitrogen in the soil, the degree of enrichment of humus with nitrogen, and microbiological activity were determined. In chronoser- ies, the carbon content connects with the microbiological activity. Thus, as the age increases, carbon and nitrogen content decreases and microbiological activity increases. This is due to the high level of carbon involvement in the biological cycle of the ecosystem. The decrease in nitrogen content is associated with a change in vegetation on the coastal transgression. A high rate of stability of microbiological communities in the investigated areas was noted.
Analysis of the molecular composition of HAs showed that aliphatic groups accumulate in the soils. This is due to the precursors of humification. Because of the increased oxidation, HAs molecules have a high migration ability. Due to evolution of Podzols, aliphatic groups and the accumulation of humic substances in the soil increased, with an increase of -OCH compounds in molecular composition of HAs; it makes HAs more aggressive and leads to increased migration ability. The molecular composition of HAs of young soils is enriched with aromatic fragments and oxygen-containing functional groups, which ensures their high thermodynamic stability.
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