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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Environmental Dynamics and Global Climate Change</journal-id><journal-title-group><journal-title xml:lang="en">Environmental Dynamics and Global Climate Change</journal-title><trans-title-group xml:lang="ru"><trans-title>Environmental Dynamics and Global Climate Change</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2218-4422</issn><issn publication-format="electronic">2541-9307</issn><publisher><publisher-name xml:lang="en">Yugra State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">634187</article-id><article-id pub-id-type="doi">10.18822/edgcc634187</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Experimental works</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экспериментальные работы</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Features of carbon forms distribution in peat deposits of an oligotrophic bog in the Kondinsky Lakes Nature Park</article-title><trans-title-group xml:lang="ru"><trans-title>Features of carbon forms distribution in peat deposits of an oligotrophic bog in the Kondinsky Lakes Nature Park</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name><surname>Shanyova</surname><given-names>V. S.</given-names></name><address><country country="RU">Russian Federation</country></address><email>SHANYOVA.VIKA@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Batrshina</surname><given-names>V. R.</given-names></name><address><country country="RU">Russian Federation</country></address><email>lera.batrshina@icloud.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name><surname>Rakhova</surname><given-names>S. E.</given-names></name><address><country country="RU">Russian Federation</country></address><email>sonya.rahova00@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en"></institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Югорский государственный университет»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-21" publication-format="electronic"><day>21</day><month>04</month><year>2025</year></pub-date><volume>16</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>13</fpage><lpage>32</lpage><history><date date-type="received" iso-8601-date="2024-07-10"><day>10</day><month>07</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Shanyova V.S., Batrshina V.R., Rakhova S.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Shanyova V.S., Batrshina V.R., Rakhova S.E.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Shanyova V.S., Batrshina V.R., Rakhova S.E.</copyright-holder><copyright-holder xml:lang="ru">Shanyova V.S., Batrshina V.R., Rakhova S.E.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nd/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://edgccjournal.org/EDGCC/article/view/634187">https://edgccjournal.org/EDGCC/article/view/634187</self-uri><abstract xml:lang="en"><p>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.</p> <p>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.</p> <p>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/m<sup>2</sup>. 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 (<italic>Sph. balticum, Sph. majus, Sph. divinum </italic>and <italic>Sph. fuscum</italic>). 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, <italic>S</italic><italic>cheuchzeria</italic> and dwarf shrubs in the stratigraphic profile. A decrease in DOC concentrations is observed with the predominance of <italic>Sph. balticum</italic> and <italic>Sph. divinum</italic>. The average DOC concentration in the peat deposit is 241.27±52.48 mg/l. The SUVA<sub>254</sub> index has maximum values of 0.55±0.5 on average at depths of 100-200 cm. With an increase in the content of <italic>Sph. fuscum</italic> and <italic>Sph. balticum</italic>, the SUVA<sub>254</sub> index decreases to 0.36. The bottom layer of all profiles is characterized by minimum SUVA<sub>254</sub> 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.</p></abstract><trans-abstract xml:lang="ru"><p>В статье представлены результаты исследования трех стратиграфических профилей и состава растворенного органического вещества (РОВ) ненарушенных участков олиготрофного болота территории природного парка «Кондинские озера». Целью данного исследования была оценка влияния ботанического состава и физико-химических параметров торфяной залежи на количество и состав растворенного органического углерода (РОУ). Для достижения данной цели были поставлены следующие задачи: определить физико-химические показатели торфа и изучить стратиграфию торфяной залежи, определить содержание органического углерода, концентрацию и состав РОУ в торфяной залежи. Глубина торфяной залежи изменялась в пределах 3.5-4 м. Средняя концентрация органического углерода в торфе составляет 50±9.8%, а средний запас органического углерода в торфяной залежи составляет 205±21.73 кг/м<sup>2</sup>. В стратиграфическом профиле торфяной залежи выделяется прослойка эвтрофного торфа, сменяющегося на мезотрофный, а после на олиготрофный торф, который характеризуется преобладанием сфагновых мхов (<italic>Sph. balticum, Sph. majus, Sph. divinum</italic> и <italic>Sph. fuscum</italic>). Обнаружено, что по шкале Л.Г. Раменского высокий показатель увлажнения (УВ) соответствует низкому значению показателя богатства и засоления (БЗ). Концентрации РОУ имеют отрицательный коэффициент корреляции с УВ и положительный коэффициент с содержанием пушицы, шейхцерии и кустарничков в стратиграфическом профиле. Снижение концентрации РОУ наблюдается при преобладании <italic>Sph. balticum</italic> и <italic>Sph. divinum</italic>. Среднее содержание РОУ в торфяной залежи имеет значение 241.27±52.48 мг/л. Показатель SUVA<sub>254</sub> имеет максимальные значения в среднем 0.55±0.5 на глубинах 100-200 см. С увеличением содержания <italic>Sph. fuscum</italic> и <italic>Sph. balticum</italic> показатель SUVA<sub>254</sub> снижается до 0.36. Придонный слой всех профилей характеризуется минимальными значениями SUVA<sub>254 </sub>в связи с присутствием примеси минерального грунта. Гуминовые вещества и средний молекулярный вес соединений зависимы друг от друга. Коэффициент среднего молекулярного веса органических соединений по всей глубине имеет среднее значение 4.8±0.8, а средние значения коэффициента соотношения гумусовых веществ равны 7.13±3.2.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Kondinsky lakes</kwd><kwd>nature part</kwd><kwd>peat core</kwd><kwd>DOC</kwd><kwd>SUVA254</kwd><kwd>stratigraphy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Кондинские озера</kwd><kwd>природный парк</kwd><kwd>торфяной керн</kwd><kwd>РОУ</kwd><kwd>SUVA254</kwd><kwd>стратиграфия</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out with the support of a grant from the Government of the Tyumen Region in accordance with the program of the West Siberian Interregional Scientific and Educational Center of World Class within the framework of the national project "Science".</funding-statement><funding-statement xml:lang="ru">Работа выполнена при поддержке гранта Правительства Тюменской области в соответствии с программой Западно-Сибирского межрегионального научно-образовательного центра мирового уровня в рамках национального проекта «Наука».</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Аgren A., Buffam I., Berggren M., Bishop K., Jansson M., Laudon H. 2008. 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