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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">isplta</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Санкт-Петербургской лесотехнической академии</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2079-4304</issn><issn pub-type="epub">2658-5871</issn><publisher><publisher-name>СПбГЛТУ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21266/2079-4304.2024.251.202-214</article-id><article-id custom-type="elpub" pub-id-type="custom">isplta-426</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЛЕСНОЕ ХОЗЯЙСТВО</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FORESTRY</subject></subj-group></article-categories><title-group><article-title>Методика экспресс-оценки плотности древесины в ценопопуляциях сосны обыкновенной</article-title><trans-title-group xml:lang="en"><trans-title>Rapid assessment of wood density in the Scots pine cenopopulations</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Демаков</surname><given-names>Ю. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Demakov</surname><given-names>Yu. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ДЕМАКОВ Юрий Петрович – профессор кафедры лесных культур, селекции и биотехнологии, доктор биологических наук, лауреат Государственной премии Республики Марий Эл</p><p>424000, пл. Ленина, д. 3, г. Йошкар-Ола</p></bio><bio xml:lang="en"><p>DEMAKOV Yuriy P. – DSc (Biological), Associate Professor, Department of Forest Crops, Breeding and Biotechnology, Laureate of the State Prize of the Republic of Mari El.</p><p>424000. Lenin sq. 3. Yoshkar-Ola</p></bio><email xlink:type="simple">DemakovYP@volgatech.net</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6500-5377</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шарапов</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sharapov</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ШАРАПОВ Евгений Сергеевич – профессор кафедры строительных конструкций и водоснабжения, доцент, доктор технических наук</p><p>424000, пл. Ленина, д. 3, г. Йошкар-Ола</p><p>ResearcherID: D-7953-2015</p></bio><bio xml:lang="en"><p>SHARAPOV Evgeniy S. – DSc (Technical), Professor, Department of Building Structures and Water Supply</p><p>424000. Lenin sq. 3. Yoshkar-Ola</p><p>ResearcherID: D-7953-2015</p></bio><email xlink:type="simple">SharapovES@volgatech.net</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1370-1285</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Королев</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Korolev</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>КОРОЛЕВ Александр Сергеевич – старший научный сотрудник департамента научной и международной деятельности, доцент кафедры безопасности жизнедеятельности, кандидат технических наук</p><p>424000, пл. Ленина, д. 3, г. Йошкар-Ола </p></bio><bio xml:lang="en"><p>KOROLEV Alexander S. – PhD (Technical), Senior Researcher Department of scientific and international activities, Associate Professor Department of Emergency Management</p><p>424000. Lenin sq. 3. Yoshkar-Ola</p></bio><email xlink:type="simple">KorolevAS@volgatech.net</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7507-8588</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шейкина</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sheikina</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ШЕЙКИНА Ольга Викторовна – доцент кафедры лесных культур, селекции и биотехнологии, доктор биологических наук</p><p>424000, пл. Ленина, д. 3, г. Йошкар-Ола</p><p>ResearcherID: AAB-2991-2020</p><p>Scopus AuthorID: 57219486493</p></bio><bio xml:lang="en"><p>SHEIKINA Olga V. – DSc (Biological), Associate Professor, Department of Forest Crops, Breeding and Biotechnology</p><p>424000. Lenin sq. 3. Yoshkar-Ola</p><p>ResearcherID: AAB-2991- 2020</p><p>Scopus AuthorID: 57219486493</p></bio><email xlink:type="simple">shejkinaov@volgatech.net</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Поволжский государственный технологический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Volga State University of Technology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>27</day><month>01</month><year>2025</year></pub-date><volume>0</volume><issue>251</issue><fpage>202</fpage><lpage>214</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Демаков Ю.П., Шарапов Е.С., Королев А.С., Шейкина О.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Демаков Ю.П., Шарапов Е.С., Королев А.С., Шейкина О.В.</copyright-holder><copyright-holder xml:lang="en">Demakov Y.P., Sharapov E.S., Korolev A.S., Sheikina O.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://izvestiya-lta.spbftu.ru/jour/article/view/426">https://izvestiya-lta.spbftu.ru/jour/article/view/426</self-uri><abstract><p>Приведены данные по вариабельности базисной плотности древесины в чистых по составу ценопопуляциях сосны обыкновенной (Pinus sylvestris L.) на территории Республики Марий Эл. Исследования проведены в 2023–2024 годах на 38 объектах в древостоях разного возраста (от 30 до 240 лет), происхождения и условий произрастания. На каждом из них у деревьев измеряли на высоте 1,3 м от корневой шейки диаметр ствола в коре и брали с помощью бурава Пресслера (Haglöf Sweden AB) цилиндрические керны диаметром 5,15 мм и длиной 50 мм. Объем выборки кернов на каждом объекте варьировал от 15 до 130 шт. Цифровой эмпирический материал обработан стандартными методами математической статистики на ПК с использованием пакетов соответствующих прикладных программ. Показано, что для оценки среднего значения плотности древесины, которое может изменяться в ценопопуляциях сосны обыкновенной от 320 до 520 кг´м–3, необходимо взять керны у 20–25 средних по размеру деревьев, что обеспечит с вероятностью 99% погрешность не более ± 3%, а для оценки же с погрешностью ± 5% – у 12–15. Минимальное и максимальное значения оцениваемого параметра в каждой ценопопуляции будут составлять соответственно 75 и 140% относительно средней арифметической его величины. Деревья в ценопопуляциях для оценки данного параметра можно отбирать либо регулярно по ходовой линии, либо случайным образом, исключая лишь особи, резко выделяющиеся по размерам. Базисную плотность древесины целесообразнее оценивать стереометрическим способом, поскольку он по точности не уступает гидростатическому, который более сложен и трудоемок.</p></abstract><trans-abstract xml:lang="en"><p>The paper presents the data on the variability of wood base density in the pure Scots pine (Pinus sylvestris L.) cenopopulations in the Mari El Republic. The studies were conducted on 38 plots in the stands of different ages (30 to 240 years old), origins and growing conditions in 2023–2024. In each plot, we measured tree trunks with bark and took cylindrical cores of 5.15 mm in diameter and 50 mm in length using a Pressler increment borer (Haglöf Sweden AB). The sample size in each plot varies from 15 to 30 cores. The numeric empirical material was processed by standard methods of mathematical statistics using a PC with packages of relevant applications. It is demonstrated that the assessment of the mean value of wood density, which may vary in the Scots pine cenopopulations from 320 kg×m–3 to 520 kg×m–3, requires cores from 20 or 25 trees of the average size that would ensure an error of not more than ± 3% with a probability of 99%, while for assessment with an error of ± 5%, it is necessary to take cores from 12 to 15 trees. The minimum and maximum values of the assessed parameter in each cenopopulation will be 75% and 140%, respectively, in relation to the arithmetic mean of its value. To assess this parameter, trees in the cenopopulations may be selected either regularly along the computation line or randomly, except the trees with sharply outstanding sizes. It is more appropriate to assess the base density of wood by a stereometrical method as it provides the accuracy that is not less than that of a hydrostatic method, which is more difficult and timeconsuming.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сосна обыкновенная</kwd><kwd>ценопопуляции</kwd><kwd>древесина</kwd><kwd>базисная плотность</kwd><kwd>вариабельность</kwd><kwd>экспресс-оценка</kwd><kwd>оптимизация объема выборки</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Scots pine</kwd><kwd>coenopopulations</kwd><kwd>wood</kwd><kwd>basis density</kwd><kwd>variability</kwd><kwd>rapid assessment</kwd><kwd>sample size optimization</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена за счет гранта Российского научного фонда № 23-16-00220 (https://rscf.ru/project/23-16-00220/).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Гринин А.С., Орехов Н.А., Новиков В.Н. 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