title: Essential role of forest fires in humic acids structure and composition alteration
metadata.name: dc.contributor.author
metadata.value: Chebykina, Ekaterina
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Abakumov, Evgeny
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2022-12-01T09:34:41Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2022-12-01T09:34:41Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2022-11-22
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Chebykina, E.; Abakumov, E. Essential Role of Forest Fires in Humic Acids Structure and Composition Alteration. Agronomy 2022, 12, 2910. https://doi.org/ 10.3390/agronomy12122910
metadata.lang: en_GB
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/38618
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Pyrogenic components of soil organic matter are practically not taken into account when assessing the implications of global climate changes on the SOM sequestration rate and its stability. In this regard, both the amount and structural stability of SOM were investigated for postpyrogenic forest–steppe environments. Mature unaffected by fire Psamment Entisols were investigated in comparison with same soil strongly affected by surface and crown fires in 2010 in Tolyatti city. This article discusses postpyrogenic succession when comparing the results of field works in 2010 with 2020. The elemental composition of humic acids as well as 13C NMR spectra were investigated for the studied humic acids. Moreover, for the first time ever, integrated indicators of HAs’ molecular composition were presented for postpyrogenic soils. The data obtained showed that there are significant changes in the structural organization of organic matter as a result of forest fires. A simultaneous decrease in the H/C and O/C atomic ratios was identified as a result of fire, which indicates a slight loss of oxygen-containing functional groups, while the aromaticity degree of molecules increases. An increase in the content of oxygen-containing groups in the HA molecules was shown for 10 years after the fires, which was accompanied by the oxidation of the HA molecule with the same increase in the aromaticity degree of the HA molecule. The HA molecules of 2020 turned out to be more resistant to environmental factors compared to analogues in 2010. As a result of fires, the aromaticity degree of HAs molecules significantly increases.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: А grant from the President of the Russian Federation for young
  PhDs No. MK-4596.2022.1.4.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: MDPI
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Frontier Studies in Composition of Humic Substances and Soil Organic Matter;2910
metadata.lang: -
metadata.name: dc.subject
metadata.value: wildfire
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: postpyrogenic succession
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: soil organic matter
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: 13C-NMR spectroscopy
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: crown fire
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: surface fire
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Essential role of forest fires in humic acids structure and composition alteration
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: agronomy-12-02910.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/38618/1/agronomy-12-02910.pdf
resources.format: Adobe PDF
resources.size: 9,59 MB