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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">10.21266/2079-4304.2025.256.322-334</article-id><article-id custom-type="elpub" pub-id-type="custom">isplta-656</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>Плотность древесины ели на лесных и постагрогенных землях Ленинградской области</article-title><trans-title-group xml:lang="en"><trans-title>Spruce wood density on forest and postagrogenic lands of the Leningrad region</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7504-5743</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Данилов</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Danilov</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ДАНИЛОВ Дмитрий Александрович – заведующий кафедрой почвоведения, доктор сельскохозяйственных наук </p><p>194021, Институтский пер., д. 5, Санкт-Петербург</p></bio><bio xml:lang="en"><p>DANILOV Dmitriy A. – DSc (Agriculture), Head of Soil Science Department</p><p>194021. Institute per. 5. St. Petersburg</p></bio><email xlink:type="simple">stown200@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Андреев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Andreev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>АНДРЕЕВ Александр Викторович – аспирант </p><p>194021, Институтский пер., д. 5, Санкт-Петербург</p></bio><bio xml:lang="en"><p>ANDREEV Alexandr V. – PhD student</p><p>194021. Institute per. 5. St. Petersburg</p></bio><email xlink:type="simple">piluxa16011@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Санкт-Петербургский государственный лесотехнический университет имени С.М. Кирова<country>Россия</country></aff><aff xml:lang="en">St.Petersburg State Forest Technical University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>12</day><month>03</month><year>2026</year></pub-date><volume>0</volume><issue>256</issue><elocation-id>322–334</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Данилов Д.А., Андреев А.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Данилов Д.А., Андреев А.В.</copyright-holder><copyright-holder xml:lang="en">Danilov D.A., Andreev A.V.</copyright-holder><license 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/656">https://izvestiya-lta.spbftu.ru/jour/article/view/656</self-uri><abstract><p>В условиях Лужско-Оредежского ландшафта Ленинградской области проведено исследование показателей плотности древесины ели.  Объектами исследования были спелые условно чистые по составу ельники, произрастающие на лесных и постагрогенных землях. Для елового древостоя, произрастающего на старопахотных землях, отмечается большая плотность древесины, чем для насаждений на лесных почвах. Смоделированные графики квадратичной функции позволяют прогнозировать плотность древесины по высоте ствола ели для сходных условий произрастания. В ходе исследования выявлен различный характер формирования плотности древесины ели по высоте ствола в различных ступенях толщины деревьев. Различия подтверждены дисперсионным анализом полученных данных. </p></abstract><trans-abstract xml:lang="en"><p>In the conditions of the Luga-Oredezhsky landscape of the Leningrad region, a study of the density of spruce wood was conducted.  The objects of the study were ripe relatively pure spruce forests growing on forest and postagrogenic lands. For spruce stands growing on old arable lands, there is a higher density of wood than for plantations on forest soils. The modeled graphs of the quadratic function make it possible to predict the density of wood by the height of the spruce trunk for similar growing conditions. The study revealed the different nature of the formation of the density of spruce wood in the height of the trunk at different levels of tree thickness. The differences are confirmed by a variance analysis of the data obtained. </p></trans-abstract><kwd-group xml:lang="ru"><kwd>условно чистые древостои ели</kwd><kwd>лесные и постагрогенные земли</kwd><kwd>почвы</kwd><kwd>плотность древесины</kwd><kwd>относительная высота ствола</kwd><kwd>дисперсионный анализ</kwd><kwd>графики квадратичной функции</kwd></kwd-group><kwd-group xml:lang="en"><kwd>conditionally pure stands of spruce</kwd><kwd>forest and postagrogenic lands</kwd><kwd>soils</kwd><kwd>wood density</kwd><kwd>relative trunk height</kwd><kwd>analysis of variance</kwd><kwd>graphs of the quadratic function</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Апарин Б.Ф. Географические основы рационального использования почв (на двучленных породах) / под ред. И.В. Игнатенко. 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