Features of carbon forms distribution in peat deposits of an oligotrophic bog in the Kondinsky Lakes Nature Park
- Authors: Shanyova V.S.1, Batrshina V.R.1, Rakhova S.E.1
-
Affiliations:
- ФГБОУ ВО «Югорский государственный университет»
- Issue: Vol 16, No 1 (2025)
- Pages: 13-32
- Section: Experimental works
- URL: https://bakhtiniada.ru/EDGCC/article/view/292155
- DOI: https://doi.org/10.18822/edgcc634187
- ID: 292155
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Abstract
Wetland ecosystems play a key role in the global carbon cycle, accumulating significant amounts of carbon and influencing climate processes. The study of the dynamics of carbon accumulation, dissolved organic carbon (DOC) and the stratigraphy of peat deposits allows us to assess the impact of climate change on wetlands. The results of the work are important for predicting the response of ecosystems to global warming and developing measures for their conservation. In this study, we examined three stratigraphic profiles and the composition of dissolved organic matter (DOM) of undisturbed areas of an oligotrophic bog in the Kondinskie Lakes Nature Park.
The aim of this study was to assess the influence of the macrofossil and physicochemical parameters of the peat deposit on the amount and composition of dissolved organic carbon (DOC). To attain this aim, the following tasks were set: to determine the physicochemical characteristics of peat, study the stratigraphy of the peat deposit and determine the content of organic carbon, the concentration and composition of DOC in the peat deposit. Peat cores were collected in the spring (March 2023). The depth of the peat deposit varied within 3.5-4 m. In this paper, the following methods were used: stratigraphic method, peat moisture determination, elemental analysis of organic carbon, pH, determination of spectral characteristics, calculation of organic carbon reserves, moisture index (MI) and active soil richness and salinity (RS) indices according to the L.G. Ramensky scales. Peat moisture content was determined by the difference in the mass of the wet and dry sample. Total organic carbon content was determined by the EA-3000 elemental analyzer. Dissolved organic carbon was determined by a Flash-2000 elemental analyzer (Thermo Scientific, USA). A binocular microscope (10-40× magnification; Zeiss Axiostar, Jena, Germany) was used to determine plant residues and the degree of decomposition. The methodology was carried out in accordance with the protocols [Mauquoy, Van Geell, 2013] using a database of key samples, i.e. a collection of plant residues that were found in the region and used to determine the macrofossil of peat. The calculation was made in the integrated botanical information system IBIS 7.2. Measurements of spectral characteristics were made by a UV/Visible Spectrophotometer T8DCS (PERSEE, China) at wavelengths of 250, 254, 365, 400 and 600 nm. In the UV-Win program, a baseline determining zero light absorption was constructed in relation to deionized water. The pH of peat was measured potentiometrically (HANNA Instruments, Edge, USA) in a suspension of a peat sample. The data analysis was performed in R, utilizing cluster analysis and correlation testing.
The average concentration of organic carbon in peat is 50±9.8%, and the average reserve of organic carbon in a peat deposit is 205±21.73 kg/m2. In the stratigraphic profile of the peat deposit, a layer of eutrophic peat is identified and further replaced by mesotrophic, and then by oligotrophic peat, which is characterized by the predominance of sphagnum mosses (Sph. balticum, Sph. majus, Sph. divinum and Sph. fuscum). It was found that a high moisture index (MI) corresponds to a low value of the richness and salinity index (RS) according to the L.G. Ramenskii scale. DOC concentrations have a negative correlation coefficient with MI and a positive correlation coefficient with the content of cotton grass, Scheuchzeria and dwarf shrubs in the stratigraphic profile. A decrease in DOC concentrations is observed with the predominance of Sph. balticum and Sph. divinum. The average DOC concentration in the peat deposit is 241.27±52.48 mg/l. The SUVA254 index has maximum values of 0.55±0.5 on average at depths of 100-200 cm. With an increase in the content of Sph. fuscum and Sph. balticum, the SUVA254 index decreases to 0.36. The bottom layer of all profiles is characterized by minimum SUVA254 values due to the presence of mineral soil impurities. The coefficient of the average molecular weight of organic compounds over the entire depth has an average value of 4.8±0.8, and the average values of the humic substance ratio coefficient are 7.13±3.2.
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##article.viewOnOriginalSite##About the authors
V. S. Shanyova
ФГБОУ ВО «Югорский государственный университет»
Author for correspondence.
Email: SHANYOVA.VIKA@mail.ru
Russian Federation, г. Ханты-Мансийск
V. R. Batrshina
ФГБОУ ВО «Югорский государственный университет»
Email: lera.batrshina@icloud.com
Russian Federation, г. Ханты-Мансийск
S. E. Rakhova
ФГБОУ ВО «Югорский государственный университет»
Email: sonya.rahova00@mail.ru
Russian Federation, г. Ханты-Мансийск
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