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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">30025</article-id><article-id pub-id-type="doi">10.22363/2313-2310-2021-29-2-127-137</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Ecology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экология</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">Variability of leaves of Betula pendula Roth during the growing season in the recreation area in the industrial center</article-title><trans-title-group xml:lang="ru"><trans-title>Изменчивость листьев Betula pendula Roth в течение вегетационного периода в рекреационной зоне промышленного центра</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1615-7005</contrib-id><name-alternatives><name xml:lang="en"><surname>Tagirova</surname><given-names>Olesya V.</given-names></name><name xml:lang="ru"><surname>Тагирова</surname><given-names>Олеся Васильевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Biological Sciences, Associate Professor, Associate Professor of the Department of Ecology, Geography and Nature Management</p></bio><bio xml:lang="ru"><p>кандидат биологических наук, доцент, доцент кафедры экологии, географии и природопользования</p></bio><email>olecyi@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6617-1027</contrib-id><name-alternatives><name xml:lang="en"><surname>Kulagin</surname><given-names>Alexsei Yu.</given-names></name><name xml:lang="ru"><surname>Кулагин</surname><given-names>Алексей Юрьевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of Biological Sciences, Professor, Head of the Forestry Laboratory</p></bio><bio xml:lang="ru"><p>доктор биологических наук, профессор, заведующий лабораторией лесоведения, Уфимский институт биологии</p></bio><email>coolagin@list.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Bashkir State Pedagogical University named after M. Akmulla</institution></aff><aff><institution xml:lang="ru">Башкирский государственный педагогический университет имени М. Акмуллы</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ufa Federal Research Center of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Уфимский федеральный исследовательский центр Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-30" publication-format="electronic"><day>30</day><month>12</month><year>2021</year></pub-date><volume>29</volume><issue>2</issue><issue-title xml:lang="en">VOL 29, NO2 (2021)</issue-title><issue-title xml:lang="ru">ТОМ 29, №2 (2021)</issue-title><fpage>127</fpage><lpage>137</lpage><history><date date-type="received" iso-8601-date="2022-01-18"><day>18</day><month>01</month><year>2022</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Tagirova O.V., Kulagin A.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Тагирова О.В., Кулагин А.Ю.</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Tagirova O.V., Kulagin A.Y.</copyright-holder><copyright-holder xml:lang="ru">Тагирова О.В., Кулагин А.Ю.</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/30025">https://journals.rudn.ru/ecology/article/view/30025</self-uri><abstract xml:lang="en"><p style="text-align: justify;">Research was carried out at the Ufa Industrial Center on the territory of recreational zone. Morphological changes in birch leaves (Betula pendula Roth) during the growing season of 2019 are shown. Model birch trees grow on a permanent trial plot. On the trees, 10 leaves were numbered. During the growing season (June - September) photographs of each leaf were taken. The integral indicator of the stability of leaf development is calculated on five grounds. Statistical processing of the data obtained. It has been established that there are deviations in the morphological development of birch leaves. It is shown that an individual trajectory of morphological development is characteristic of leaves. The phenomenon of adaptive polymorphism of birch leaves is noted. Moreover, the morphological and functional features of the leaf are inextricably linked.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Исследования проводились в Уфимском индустриальном центре на территории рекреационной зоны. Показаны морфологические изменения листьев березы ( Betula pendula Roth) в вегетационный период 2019 г. Модельные березы растут на постоянном опытном участке. На деревьях были пронумерованы 10 листьев. Во время вегетационного периода (июнь - сентябрь) сделаны фотографии каждого листа. Интегральный показатель устойчивости развития листьев рассчитывается по пяти признакам. Выполнена статистическая обработка полученных данных. Установлено, что имеются отклонения в морфологическом развитии листьев березы. Показано, что для листьев характерна индивидуальная траектория морфологического развития. Отмечается феномен адаптивного полиморфизма листьев березы. При этом морфологические и функциональные особенности листа неразрывно связаны.</p></trans-abstract><kwd-group xml:lang="en"><kwd>birch</kwd><kwd>integral indicator</kwd><kwd>leaf polymorphism</kwd><kwd>industrial center</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>береза</kwd><kwd>интегральный показатель</kwd><kwd>полиморфизм листьев</kwd><kwd>промышленный центр</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The studies were carried out as part of the program of the Scientific and Educational Center “Dendroecology and Environmental Management” and using the equipment of the Center for Collective Use “Agidel” of the Ufa Federal Research Center of the Russian Academy of Sciences. The studies were carried out on the topic No. AAAA-A18-118022190103-01.</funding-statement><funding-statement xml:lang="ru">Исследования выполнены по программе научно-образовательного центра «Дендроэкология и природопользование» с использованием оборудования Центра коллективного пользования «Агидель» Уфимского федерального исследовательского центра Российской академии наук. Исследования выполнены теме № AAAA-A18-118022190103-01.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Konstantinov EL. Analysis of the stability of warty birch (Betula pendula Roth.) as a method of bioindication of environmental quality. Problems of General Biology and Applied Ecology. 1997;(1):107-108. (In Russ.)</mixed-citation><mixed-citation xml:lang="ru">Константинов Е.Л. 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