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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">Lesnoy Vestnik / Forestry Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Lesnoy Vestnik / Forestry Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Лесной вестник / Forestry Bulletin</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2542-1468</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">708029</article-id><article-id pub-id-type="doi">10.17816/2542-1468-2026-3-5-16</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Biological and technological aspects of forestry</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Биологические и технологические аспекты лесного хозяйства</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">Modeling spruce trees distribution series in engraver-beetle-damaged forest stands in Moscow region</article-title><trans-title-group xml:lang="ru"><trans-title>Моделирование рядов распределения деревьев ели в поврежденных короедом-типографом древостоях Подмосковья</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lebedev</surname><given-names>Aleksandr V.</given-names></name><name xml:lang="ru"><surname>Лебедев</surname><given-names>Александр Вячеславович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Agriculture), Associate Professor</p></bio><bio xml:lang="ru"><p>д-р с.-х. наук, доцент</p></bio><email>alebedev@rgau-msha.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gosteva</surname><given-names>Dar’ya Yu.</given-names></name><name xml:lang="ru"><surname>Гостева</surname><given-names>Дарья Юрьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>pg.</p></bio><bio xml:lang="ru"><p>аспирант</p></bio><email>d.gosteva@rgau-msha.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Russian State Agrarian University – Moscow Timiryazev Agricultural Academy</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Российский государственный аграрный университет – МСХА имени К.А. Тимирязева» (РГАУ – МСХА им. К.А. Тимирязева)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-06-01" publication-format="electronic"><day>01</day><month>06</month><year>2026</year></pub-date><volume>30</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>5</fpage><lpage>16</lpage><history><date date-type="received" iso-8601-date="2026-05-30"><day>30</day><month>05</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-05-30"><day>30</day><month>05</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Lebedev A.V., Gosteva D.Y.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Лебедев А.В., Гостева Д.Ю.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Lebedev A.V., Gosteva D.Y.</copyright-holder><copyright-holder xml:lang="ru">Лебедев А.В., Гостева Д.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/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/2542-1468/article/view/708029">https://journals.eco-vector.com/2542-1468/article/view/708029</self-uri><abstract xml:lang="en"><p>Data from 19 trial plots of the spruce stands in the Moscow region are presented. A three-parameter Weibull equation and the method of moments for parameter recovery were applied to create a model of the diameter distribution of Norway spruce (<italic>Picea abies</italic>) trees in stands damaged by the European spruce bark beetle (<italic>Ips typographus</italic>). The analysis employed descriptive statistics methods (calculation of midpoint distribution) and regression analysis. Consistency was revealed between the descriptive statistics of diameter distribution series for the entire stand and for severely weakened, dying, and dead trees, indicating the feasibility of their combined use for creating a generalized model. The input taxational variables for the model are the root mean square diameter and the average condition category. Based on these, the prediction of the diameter distribution of the total number of trees (condition categories 1–5) and separately for severely weakened, dying, and dead trees (condition categories 3–5) is demonstrated. It was established that the distribution of trees in condition categories 3–5 reflects the structure of pathological dieback, which allows for the estimation of sanitary and forest health measures (selective and clear sanitary felling) in spruce stands.</p></abstract><trans-abstract xml:lang="ru"><p>Представлены данные 19 пробных площадей, заложенных в еловых насаждениях Московской области. Применено трехпараметрическое уравнение Вейбулла и моментный метод восстановления параметров для построения модели распределения деревьев ели (<italic>Picea abies</italic>) по толщине в древостоях, поврежденных короедом-типографом (<italic>Ips typographus</italic>). При анализе использованы методы описательной статистики (расчет центральных моментов распределения) и регрессионный анализ. Выявлена согласованность между описательными статистиками рядов распределения деревьев по толщине для всего древостоя и для сильно ослабленных, усыхающих и погибших деревьев, что указывает на возможность их совместного использования для построения обобщенной модели. В качестве входных таксационных переменных модели определены среднеквадратический диаметр и средняя категория состояния. На их основании показано предсказание распределения по толщине общего количества деревьев (1–5 категории состояния) и отдельно сильно ослабленных, усыхающих и погибших деревьев (3–5 категории состояния). Установлено, что распределение деревьев 3–5 категорий состояния отражает структуру патологического отпада, что позволяет оценивать объемы санитарно-оздоровительных мероприятий (выборочные и сплошные санитарные рубки) в еловых древостоях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>distribution of trees by thickness</kwd><kwd>Weibull distribution</kwd><kwd>average condition category</kwd><kwd>spruce stands</kwd><kwd>engraver-beetle</kwd><kwd>Moscow region</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>распределение деревьев по толщине</kwd><kwd>распределение Вейбулла</kwd><kwd>средняя категория состояния</kwd><kwd>еловые древостои</kwd><kwd>короед-типограф</kwd><kwd>Московская область</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Mozolevskaya E.G., Lipatkin V.A. 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