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Post-agrogenic dynamics of molecular composition of humic acids isolated from different-aged soils of fallow lands in North-West Russia.

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Title: Post-agrogenic dynamics of molecular composition of humic acids isolated from different-aged soils of fallow lands in North-West Russia.
Authors: Polyakov, V.1 (AUTHOR) v.polyakov@spbu.ru, Abakumov, E.1 (AUTHOR), Nizamutdinov, T.1 (AUTHOR), Artyukhov, E.1 (AUTHOR)
Source: Environmental Earth Sciences. Sep2025, Vol. 84 Issue 18, p1-13. 13p.
Subjects: Carbon sequestration, Fallowing, Biodegradation, Humic acid, Soil composition, Nuclear magnetic resonance spectroscopy, Plant succession
Geographic Terms: Northern Russia, Russia
Abstract: Today, a significant amount of land has transitioned from agricultural use to fallow state. These lands are undergoing processes such as shrub encroachment, waterlogging, and afforestation, which lead to degradation and the loss of carbon from soils. To analyze the carbon state of soils on fallow lands in the North-West of Russia, a calculation of the content and stock of carbon in the soils was carried out, as well as elemental and molecular composition of humic acids extracted from the soils was performed. To investigate the dynamics of molecular composition, the 13C NMR spectroscopy method was used. The study revealed that soils transitioning to fallow state accumulate carbon due to the formation of coarse humus fractions, which contribute primarily to the labile carbon pool. Molecular composition of humic acids demonstrated that plant community succession in initial fallow stages promotes the formation of stable molecular complex. However, with an increase in the age of the lands in the fallow state, a decrease in the content of stable molecular complexes is observed, which can lead to an increase in the rate of biodegradation of organic matter. Article highlights: The transition of agricultural land to a fallow state leads to changes in the carbon state of soils. With increasing time in a fallow state, soils exhibit an increase in carbon stocks. In later stages of fallow, an increase in the labile carbon pool is observed, which may be susceptible to degradation. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 188626349
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  Data: Post-agrogenic dynamics of molecular composition of humic acids isolated from different-aged soils of fallow lands in North-West Russia.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+sequestration%22">Carbon sequestration</searchLink><br /><searchLink fieldCode="DE" term="%22Fallowing%22">Fallowing</searchLink><br /><searchLink fieldCode="DE" term="%22Biodegradation%22">Biodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22Humic+acid%22">Humic acid</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+composition%22">Soil composition</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+magnetic+resonance+spectroscopy%22">Nuclear magnetic resonance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+succession%22">Plant succession</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Northern+Russia%22">Northern Russia</searchLink><br /><searchLink fieldCode="DE" term="%22Russia%22">Russia</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Today, a significant amount of land has transitioned from agricultural use to fallow state. These lands are undergoing processes such as shrub encroachment, waterlogging, and afforestation, which lead to degradation and the loss of carbon from soils. To analyze the carbon state of soils on fallow lands in the North-West of Russia, a calculation of the content and stock of carbon in the soils was carried out, as well as elemental and molecular composition of humic acids extracted from the soils was performed. To investigate the dynamics of molecular composition, the 13C NMR spectroscopy method was used. The study revealed that soils transitioning to fallow state accumulate carbon due to the formation of coarse humus fractions, which contribute primarily to the labile carbon pool. Molecular composition of humic acids demonstrated that plant community succession in initial fallow stages promotes the formation of stable molecular complex. However, with an increase in the age of the lands in the fallow state, a decrease in the content of stable molecular complexes is observed, which can lead to an increase in the rate of biodegradation of organic matter. Article highlights: The transition of agricultural land to a fallow state leads to changes in the carbon state of soils. With increasing time in a fallow state, soils exhibit an increase in carbon stocks. In later stages of fallow, an increase in the labile carbon pool is observed, which may be susceptible to degradation. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Environmental Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s12665-025-12536-2
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      – Code: eng
        Text: English
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      – SubjectFull: Carbon sequestration
        Type: general
      – SubjectFull: Fallowing
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      – SubjectFull: Biodegradation
        Type: general
      – SubjectFull: Humic acid
        Type: general
      – SubjectFull: Soil composition
        Type: general
      – SubjectFull: Nuclear magnetic resonance spectroscopy
        Type: general
      – SubjectFull: Plant succession
        Type: general
      – SubjectFull: Northern Russia
        Type: general
      – SubjectFull: Russia
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      – TitleFull: Post-agrogenic dynamics of molecular composition of humic acids isolated from different-aged soils of fallow lands in North-West Russia.
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              Text: Sep2025
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