Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy
Paramagnetic activity is a fundamental property of humic substances (HSs). The agricultural use of soils does not only affect the qualitative and quantitative compositions of HSs, but also the content of free radicals (FRs) in their structure. Changes in the composition of incoming plant residues an...
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ftdoajarticles:oai:doaj.org/article:e513741ca43a4347ba1422ebe8aac00b 2023-05-15T18:30:27+02:00 Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy Evgeny Lodygin Roman Vasilevich Evgeny Abakumov 2022-11-01T00:00:00Z https://doi.org/10.3390/agronomy12112806 https://doaj.org/article/e513741ca43a4347ba1422ebe8aac00b EN eng MDPI AG https://www.mdpi.com/2073-4395/12/11/2806 https://doaj.org/toc/2073-4395 doi:10.3390/agronomy12112806 2073-4395 https://doaj.org/article/e513741ca43a4347ba1422ebe8aac00b Agronomy, Vol 12, Iss 2806, p 2806 (2022) humic acids fulvic acids paramagnetic activity free radicals soil hydromorphism Agriculture S article 2022 ftdoajarticles https://doi.org/10.3390/agronomy12112806 2022-12-30T21:15:16Z Paramagnetic activity is a fundamental property of humic substances (HSs). The agricultural use of soils does not only affect the qualitative and quantitative compositions of HSs, but also the content of free radicals (FRs) in their structure. Changes in the composition of incoming plant residues and hydrothermal conditions have an effect on soil humification rates and the paramagnetic properties of humic (HAs) and fulvic acids (FAs). Data on the influence of various factors on the content of FRs in HAs and FAs are not enough. Therefore, the purpose of this study was to examine the influence of the degree of hydromorphism and agricultural use on the paramagnetic properties of HA and FA samples obtained from taiga and tundra soils. Studies have shown that the increased hydromorphism in taiga soils leads to the growing concentration of FRs in the HA molecular structure. HAs in virgin tundra soils exhibit a lower content of unpaired electrons when shifting from automorphic soils to hydromorphic ones. Going from the south to the north, the paramagnetic activity of both HAs and FAs tends to decrease due to the overall reduction of the number of polyconjugated systems in the tundra soil HSs. The comparative analysis of the paramagnetic properties in HAs and FAs of virgin and arable soils revealed that their agricultural use reduces the FR concentration in the structure of HSs, in other words it leads to the accumulation of biothermodynamically stable and more humified compounds in the arable horizons. This contributes to the stabilization of SOM in arable soils. Article in Journal/Newspaper taiga Tundra Directory of Open Access Journals: DOAJ Articles Agronomy 12 11 2806 |
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Directory of Open Access Journals: DOAJ Articles |
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topic |
humic acids fulvic acids paramagnetic activity free radicals soil hydromorphism Agriculture S |
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humic acids fulvic acids paramagnetic activity free radicals soil hydromorphism Agriculture S Evgeny Lodygin Roman Vasilevich Evgeny Abakumov Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
topic_facet |
humic acids fulvic acids paramagnetic activity free radicals soil hydromorphism Agriculture S |
description |
Paramagnetic activity is a fundamental property of humic substances (HSs). The agricultural use of soils does not only affect the qualitative and quantitative compositions of HSs, but also the content of free radicals (FRs) in their structure. Changes in the composition of incoming plant residues and hydrothermal conditions have an effect on soil humification rates and the paramagnetic properties of humic (HAs) and fulvic acids (FAs). Data on the influence of various factors on the content of FRs in HAs and FAs are not enough. Therefore, the purpose of this study was to examine the influence of the degree of hydromorphism and agricultural use on the paramagnetic properties of HA and FA samples obtained from taiga and tundra soils. Studies have shown that the increased hydromorphism in taiga soils leads to the growing concentration of FRs in the HA molecular structure. HAs in virgin tundra soils exhibit a lower content of unpaired electrons when shifting from automorphic soils to hydromorphic ones. Going from the south to the north, the paramagnetic activity of both HAs and FAs tends to decrease due to the overall reduction of the number of polyconjugated systems in the tundra soil HSs. The comparative analysis of the paramagnetic properties in HAs and FAs of virgin and arable soils revealed that their agricultural use reduces the FR concentration in the structure of HSs, in other words it leads to the accumulation of biothermodynamically stable and more humified compounds in the arable horizons. This contributes to the stabilization of SOM in arable soils. |
format |
Article in Journal/Newspaper |
author |
Evgeny Lodygin Roman Vasilevich Evgeny Abakumov |
author_facet |
Evgeny Lodygin Roman Vasilevich Evgeny Abakumov |
author_sort |
Evgeny Lodygin |
title |
Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
title_short |
Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
title_full |
Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
title_fullStr |
Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
title_full_unstemmed |
Characterization of Humic Substances from Taiga and Tundra Soils by EPR Spectroscopy |
title_sort |
characterization of humic substances from taiga and tundra soils by epr spectroscopy |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/agronomy12112806 https://doaj.org/article/e513741ca43a4347ba1422ebe8aac00b |
genre |
taiga Tundra |
genre_facet |
taiga Tundra |
op_source |
Agronomy, Vol 12, Iss 2806, p 2806 (2022) |
op_relation |
https://www.mdpi.com/2073-4395/12/11/2806 https://doaj.org/toc/2073-4395 doi:10.3390/agronomy12112806 2073-4395 https://doaj.org/article/e513741ca43a4347ba1422ebe8aac00b |
op_doi |
https://doi.org/10.3390/agronomy12112806 |
container_title |
Agronomy |
container_volume |
12 |
container_issue |
11 |
container_start_page |
2806 |
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1766213947763982336 |