13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands
Humic acids (HAs) and fulvic acids (FAs) of two Polar soils were investigated by 13C NMR and ESR spectroscopies, investigating the degree of humification and the molecular structure. One soil, from Bolshoi Lyakhovsky Island, contains two humus horizons: modern and buried. The other soil, from Wrange...
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fthindawi:oai:hindawi.com:10.1155/2015/390591 2023-05-15T14:52:29+02:00 13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands E. Abakumov E. Lodygin V. Tomashunas 2015 https://doi.org/10.1155/2015/390591 en eng International Journal of Ecology https://doi.org/10.1155/2015/390591 Copyright © 2015 E. Abakumov et al. Review Article 2015 fthindawi https://doi.org/10.1155/2015/390591 2019-05-26T04:46:49Z Humic acids (HAs) and fulvic acids (FAs) of two Polar soils were investigated by 13C NMR and ESR spectroscopies, investigating the degree of humification and the molecular structure. One soil, from Bolshoi Lyakhovsky Island, contains two humus horizons: modern and buried. The other soil, from Wrangel Island, had only one modern humus horizon. The HAs and FAs of the two soils investigated show essential differences. The HAs show fewer oxygen-containing groups in comparison with the FAs, whereas the degree of aromaticity is two or three times higher in the HAs. The 13C NMR data also show that HAs are very different from FAs in terms of their molecular composition and hydrophobicity. Humification in the Arctic is limited by the very low content of lignin-derived compounds, due to the restricted vascular flora. As a result, the HAs, isolated from Polar soils, are more similar to the corresponding FAs than to the typical HAs of temperate soils. This was confirmed by ESR data, which show similar levels of free radical concentration for HAs and FAs and are related to the low level of aromaticity of both materials investigated. Apparently, the humification process in the soils of Polar Arctic deserts is in an initial stage. Review Arctic Wrangel Island Hindawi Publishing Corporation Arctic Wrangel Island ENVELOPE(-179.385,-179.385,71.244,71.244) International Journal of Ecology 2015 1 7 |
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Open Polar |
collection |
Hindawi Publishing Corporation |
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fthindawi |
language |
English |
description |
Humic acids (HAs) and fulvic acids (FAs) of two Polar soils were investigated by 13C NMR and ESR spectroscopies, investigating the degree of humification and the molecular structure. One soil, from Bolshoi Lyakhovsky Island, contains two humus horizons: modern and buried. The other soil, from Wrangel Island, had only one modern humus horizon. The HAs and FAs of the two soils investigated show essential differences. The HAs show fewer oxygen-containing groups in comparison with the FAs, whereas the degree of aromaticity is two or three times higher in the HAs. The 13C NMR data also show that HAs are very different from FAs in terms of their molecular composition and hydrophobicity. Humification in the Arctic is limited by the very low content of lignin-derived compounds, due to the restricted vascular flora. As a result, the HAs, isolated from Polar soils, are more similar to the corresponding FAs than to the typical HAs of temperate soils. This was confirmed by ESR data, which show similar levels of free radical concentration for HAs and FAs and are related to the low level of aromaticity of both materials investigated. Apparently, the humification process in the soils of Polar Arctic deserts is in an initial stage. |
format |
Review |
author |
E. Abakumov E. Lodygin V. Tomashunas |
spellingShingle |
E. Abakumov E. Lodygin V. Tomashunas 13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
author_facet |
E. Abakumov E. Lodygin V. Tomashunas |
author_sort |
E. Abakumov |
title |
13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
title_short |
13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
title_full |
13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
title_fullStr |
13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
title_full_unstemmed |
13C NMR and ESR Characterization of Humic Substances Isolated from Soils of Two Siberian Arctic Islands |
title_sort |
13c nmr and esr characterization of humic substances isolated from soils of two siberian arctic islands |
publisher |
International Journal of Ecology |
publishDate |
2015 |
url |
https://doi.org/10.1155/2015/390591 |
long_lat |
ENVELOPE(-179.385,-179.385,71.244,71.244) |
geographic |
Arctic Wrangel Island |
geographic_facet |
Arctic Wrangel Island |
genre |
Arctic Wrangel Island |
genre_facet |
Arctic Wrangel Island |
op_relation |
https://doi.org/10.1155/2015/390591 |
op_rights |
Copyright © 2015 E. Abakumov et al. |
op_doi |
https://doi.org/10.1155/2015/390591 |
container_title |
International Journal of Ecology |
container_volume |
2015 |
container_start_page |
1 |
op_container_end_page |
7 |
_version_ |
1766323718942883840 |