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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">RUDN Journal of Ecology and Life Safety</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Ecology and Life Safety</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Экология и безопасность жизнедеятельности</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-2310</issn><issn publication-format="electronic">2408-8919</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">52213</article-id><article-id pub-id-type="doi">10.22363/2313-2310-2026-34-3-485-499</article-id><article-id pub-id-type="edn">ESREXM</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Environmental Monitoring</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экологический мониторинг</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">Chemical composition screening of atmospheric precipitation and soil water in the Gusinoye Lake catchment area, the Valdai Upland</article-title><trans-title-group xml:lang="ru"><trans-title>Скрининг химического состава атмосферных осадков и почвенных вод на водосборе оз. Гусиное Валдайской возвышенности</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7180-4677</contrib-id><contrib-id contrib-id-type="spin">8437-6926</contrib-id><name-alternatives><name xml:lang="en"><surname>Baranov</surname><given-names>Dmitrii Yu.</given-names></name><name xml:lang="ru"><surname>Баранов</surname><given-names>Дмитрий Юрьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>junior researcher at the Laboratory of Evolutionary Biogeochemistry and Geoecology</p></bio><bio xml:lang="ru"><p>младший научный сотрудник лаборатории эволюционной биогеохимии и геоэкологии</p></bio><email>mitya.baranov.90@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2875-1693</contrib-id><name-alternatives><name xml:lang="en"><surname>Moiseenko</surname><given-names>Tat’yana I.</given-names></name><name xml:lang="ru"><surname>Моисеенко</surname><given-names>Татьяна Ивановна</given-names></name></name-alternatives><bio xml:lang="en"><p>corresponding member of the Russian Academy of Sciences, Doctor of Biological Sciences, Professor, Head of the Department of Biogeochemistry and Ecology</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН, доктор биологических наук, профессор, заведующая отделом биогеохимии и экологии</p></bio><email>moiseenko.ti@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Vernadsky Institute of Geochemistry and Analytical Chemistry</institution></aff><aff><institution xml:lang="ru">Институт геохимии и аналитической химии им. В.И. Вернадского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-09-10" publication-format="electronic"><day>10</day><month>09</month><year>2026</year></pub-date><volume>34</volume><issue>3</issue><issue-title xml:lang="en">VOL 34, NO2 (2026)</issue-title><issue-title xml:lang="ru">ТОМ 34, №2 (2026)</issue-title><fpage>485</fpage><lpage>499</lpage><history><date date-type="received" iso-8601-date="2026-09-10"><day>10</day><month>09</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Baranov D.Y., Moiseenko T.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Дмитрий Ю.Б., Татьяна И.М.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Baranov D.Y., Moiseenko T.I.</copyright-holder><copyright-holder xml:lang="ru">Дмитрий Ю.Б., Татьяна И.М.</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-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/ecology/article/view/52213">https://journals.rudn.ru/ecology/article/view/52213</self-uri><abstract xml:lang="en"><p>This study presents the results of hydrochemical monitoring of the chemical composition of atmospheric precipitation and soil water in the Valdai Upland. The influence of tree crowns and water-temperature conditions on the composition of precipitation as well as the impact of elementary landscape types on the composition of soil has been investigated. It was found that interaction with spruce tree crowns changes the calcium-bicarbonate composition of free precipitation to potassium-bicarbonate. The main input of Ca, Mg, Na, and K into undercrown water occurs due to dust washout from tree crowns. It was revealed that the pH of soil water increases with increasing depth of soil water formation and is independent of the type of elementary landscape. The concentration of macrocations decreases in soil water of the transeluvial type of elementary landscape. With increasing depth of soil water, the leaching of K, Na, Zn, Si, and SO4 is activated, which is associated with changes in the particle size distribution of soil horizons.</p></abstract><trans-abstract xml:lang="ru"><p>Представлены результаты гидрохимических наблюдений за составом атмосферных осадков и почвенных вод Валдайской возвышенности. Исследовано влияние крон деревьев и водно-температурного режима на формирование состава атмосферных осадков и типа элементарных ландшафтов на состав почвенных вод. Установлено, что при взаимодействии с кронами еловых деревьев гидрокарбонатно-кальциевый состав свободных осадков изменяется на гидрокарбонатно-калиевый. Основное поступление Ca, Mg, Na, K в подкроновые воды происходит за счет смыва пыли с крон деревьев. Выявлено, что рН почвенных вод растет с увеличением глубины формирования почвенных вод и не зависит от типа элементарного ландшафта. В почвенных водах трансэлювиального типа элементарного ландшафта снижается концентрация макрокатионов. С ростом глубины почвенных вод активизируется выщелачивание K, Na, Zn, Si, SO4, что связано с изменением гранулометрического состава почвенных горизонтов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>elementary landscapes</kwd><kwd>bulk precipitation</kwd><kwd>throughfall</kwd><kwd>water temperature regime</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>элементарные ландшафты</kwd><kwd>свободные осадки</kwd><kwd>подкроновые воды</kwd><kwd>водно-температурный режим</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Работа выполнена в рамках Госзадания Института геохимии и аналитической химии им. В.И. Вернадского РАН</institution></institution-wrap><institution-wrap><institution xml:lang="en">The work was carried out within the framework of the State Assignment of the V.I. 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