Podzol development on different aged coastal bars of Lake Ladoga

Abakumov, Evgeny; Polyakov, Vyacheslav; Orlova, Ksenia

doi:10.17223/19988591/48/1

Cited by 11 publications

(19 citation statements)

References 45 publications

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“…Our data corresponded with previously published materials from scientists working in the Arctic belt [9,45,47,52,55,64,65]. The increase of aliphatic HA fragments was associated with the specific composition of the vegetation cover and the microbiological composition and activity of the soil as well as climatic conditions [30].…”

Section: The Stabilization Of Organic Matter Based On 13 C Nmr Spectroscopysupporting

confidence: 88%

Assessments of Organic Carbon Stabilization Using the Spectroscopic Characteristics of Humic Acids Separated from Soils of the Lena River Delta

Polyakov

Abakumov

2021

Separations

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In the Arctic zone, where up to 1024 × 1013 kg of organic matter is stored in permafrost-affected soils, soil organic matter consists of about 50% humic substances. Based on the analysis of the molecular composition of humic acids, we assessed the processes of accumulation of the key structural fragments, their transformations and the stabilization rates of carbon pools in soils in general. The landscape of the Lena River delta is the largest storage of stabilized organic matter in the Arctic. There is active accumulation and deposition of a significant amount of soil organic carbon from terrestrial ecosystems in a permafrost state. Under ongoing climate change, carbon emission fluxes into the atmosphere are estimated to be higher than the sequestration and storing of carbon compounds. Thus, investigation of soil organic matter stabilization mechanisms and rates is quite an urgent topic regarding polar soils. For study of molecular elemental composition, humic acids were separated from the soils of the Lena River delta. Key structural fragments of humic matter were identified and quantified by CP/MAS 13C NMR spectroscopy: carboxyl (–COOR); carbonyl (–C=O); CH3–; CH2–; CH-aliphatic; –C-OR alcohols, esters and carbohydrates; and the phenolic (Ar-OH), quinone (Ar = O) and aromatic (Ar–) groups as benchmark Cryosols of the Lena delta river terrestrial ecosystem. Under the conditions of thermodynamic evolutionary selection, during the change between the dry and wet seasons, up to 41% of aromatic and carboxyl fragments accumulated in humic acids. Data obtained showed that three main groups of carbon played the most important role in soil organic matter stabilization, namely C, H-alkyls ((CH2)n/CH/C and CH3), aromatic compounds (C-C/C-H, C-O) and an OCH group (OCH/OCq). The variations of these carbon species’ content in separated humics, with special reference to soil–permafrost organic profiles’ recalcitrance in the current environment, is discussed.

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Section: The Stabilization Of Organic Matter Based On 13 C Nmr Spectroscopysupporting

confidence: 88%

Assessments of Organic Carbon Stabilization Using the Spectroscopic Characteristics of Humic Acids Separated from Soils of the Lena River Delta

Polyakov

Abakumov

2021

Separations

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“…The highest carbon content of HAs is 46% and it is noted in the N2 sample of Chernevaya taiga. In general, samples (19)(20)(21)(22)(23) are characterized by a higher carbon content. The decrease in the carbon content in the elemental composition is associated with the influence of soil acidity and moisture.…”

Section: Elemental Composition Of Has Isolated From Chernevaya Taiga Soilsmentioning

confidence: 99%

“…The decrease in the carbon content in the elemental composition is associated with the influence of soil acidity and moisture. Due to acidification and hydromorphism of the soil, the condensation reactions of the initial substances are difficult, and the hydrolytic decomposition of humic compounds is enhanced [22,42]. In this case, specific biochemical processes play an important role in the formation of the elemental composition.…”

Section: Elemental Composition Of Has Isolated From Chernevaya Taiga Soilsmentioning

confidence: 99%

“…Common bacterial phyla of soils of Chernevaya taiga are Proteobacteria, Verrucomicrobia, Actinobacteria, Acidobacteria, Planctomycetes, and Firmicutes [19]. Hence to the listed factors and soil characteristics of the Chernevaya taiga, its bioproductivity significantly overcomes the other zonal types of ecosystems of the boreal belt [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Elemental and Molecular Composition of Humic Acids Isolated from Soils of Tallgrass Temperate Rainforests (Chernevaya taiga) by 1H-13C HECTCOR NMR Spectroscopy

et al. 2021

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The soils of Chernevaya taiga (tallgrass fir-aspen hemiboreal rainforest) have high fertility in comparison with oligotrophic analogs formed in boreal taiga. We have studied humic acids isolated from the soils of Chernevaya and oligotrophic taiga in the Novosibirsk, Tomsk, Kemerovo and the Altai regions of Russia and for the first time the structural and molecular composition of humic acids was determined using 13C CP/MAS and 1H-13C HETCOR NMR spectroscopy. According to data obtained in this study, up to 48% of aromatic compounds accumulate in the soils of Chernevaya taiga, which is higher than in the oligotrophic taiga and comparable with this rate of steppe Chernozems. In the course of active processes of transformation of organic matter, a significant number of aromatic fragments accumulates in the middle horizons of soil profiles. Using 13C CP/MAS spectroscopy, it was possible to identify the main structural fragments (aliphatic and aromatic) that formed in humic acids of the Chernevaya taiga. The HETCOR experiment made it possible to accurately determine the boundaries of chemical shifts of the main groups of structural fragments of humic acids. Our results demonstrate that the stabilization of organic compounds occurs in the soil of the Chernevaya taiga, which leads to the resistance of organic matter to biodegradation that is not typical for benchmark soils of boreal environments.

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“…Archeological studies concluded that it had no fortification significance, and no cultural layer was found. Thus, taking into account Table (end) the time, which is required for the formation of a 4-5 cm thick E horizon that is about 1000 years old for the taiga zone of Northern Eurasia [44][45], we can conclude, that there were several stages of erosional processes that occurred during the period about 3000-4000 years ago. This idea is in good correlation with archeological data about the periodic nature of human presence within this territory, at least from the early Iron Age.…”

Section: Modern Soil Cover Of the Kondinskie Lakes Natural Park As A mentioning

confidence: 99%

Patterns of soil cover organization within the northern part of the Kondinskaya lowland (Western Siberia)

Kurasova

Konstantinov

Kulizhskiy

et al. 2020

Tomsk State University Journal of Biology

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The paper presents the results of the studies devoted to the morphological features and properties of soils representing different geomorphological conditions within the elevated relief forms of the Kondinskaya lowland, with the example of the Kondinskie Lakes Natural Park area. The northern part of the Kondinskaya lowland is characterized by a contrasting and diverse relief, which is generally not typical of the middle taiga zone of Western Siberia. Soil-morphological and-geomorphological methods formed the structural framework of this research. The results showed that Folic Albic Podzols (Geoabruptic) formed on the flat tops of ridges are characterized by a moderate thickness of the E horizon, the largest number of rock fragments, as well as by bedding with loams that have signs of paleocryogenic deformations. Albic Podzols of terraced slopes have more developed E and Bs horizons with large wedge like tongues having depth of about one meter. This group of soils is distinguished by the most diverse structure of the upper part of the profile due to the variability of morphological elements related to biogenic pedoturbations. Albic Lamellic Arenosols occupying steep slopes of the ridges are less developed, and erosional processes often interrupt soil development within this geomorphic position. Albic Gleyic Podzols (Turbic) formed under the steep slopes of high ridges develop over buried Podzols, and often contain charcoal-enriched interlayers in the bottom and middle parts of the profile. Formation of a complex profile, with series of burials, is possibly associated with the activation of erosional processes related to fires and ancient human activity. Study results showed that there is a strong relationship between the lithology on the one hand, and the intensity of podzolization and variability of soil morphological elements related to biogenic pedoturbations on the other hand. The paper contains 5 Figures, 1 Table and 51 References.

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Podzol development on different aged coastal bars of Lake Ladoga

Cited by 11 publications

References 45 publications

Assessments of Organic Carbon Stabilization Using the Spectroscopic Characteristics of Humic Acids Separated from Soils of the Lena River Delta

Assessments of Organic Carbon Stabilization Using the Spectroscopic Characteristics of Humic Acids Separated from Soils of the Lena River Delta

Elemental and Molecular Composition of Humic Acids Isolated from Soils of Tallgrass Temperate Rainforests (Chernevaya taiga) by 1H-13C HECTCOR NMR Spectroscopy

Patterns of soil cover organization within the northern part of the Kondinskaya lowland (Western Siberia)

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