Russian Journal of Biological Physics and Chemisrty Russian Journal of Biological Physics and Chemisrty АКТУАЛЬНЫЕ ВОПРОСЫ БИОЛОГИЧЕСКОЙ ФИЗИКИ И ХИМИИ 2499-9962 54110 Общая биофизика General biophysics Общая биофизика The ecological significance of the biomechanical properties of Quercus Robur L. and Quercus Rubra L. in urban spaces Экологическое значение биомеханических свойств Quercus Robur L. и Quercus Rubra L. в городских насаждениях Корниенко В. О. Kornienko V. O. dayterry@rambler.ru Донецкий национальный университет; ГУ «Донецкий ботанический сад» Донецк Россия Donetsk National University; State Institution «Donetsk Botanical Garden» Donetsk Russian Federation 25 06 2017 25 06 2017 2 1 37 40 20 06 2017 20 06 2017 https://rusjbpc.ru/en/nauka/article/54110/view

В работе представлена и проанализирована зависимость модуля Е упругости дуба черешчатого и дуба красного от сезонных изменений. Температурный диапазон изменения Е в образцах составлял -15 - +35 °С, при влажности 65-45 %. Для оценки механической устойчивости были использованы следующие параметры: RRB - относительное сопротивление изгибу, Pcr и mcr - предельно допустимая нагрузка и масса, Hcr - критическая высота ствола. Полученные данные свидетельствуют о том, что вариации модуля упругости в цикле замораживание-оттаивание сказываются в первую очередь на устойчивость деревьев с минимальным отношением диаметра ствола к его высоте. Таким образом, из группы исследованных растений при перепадах температур риску деформации или облому под действием собственного веса подвержен подрост дубов с высотой ствола более 2 м и наиболее тонкие угнетённые взрослые растения.

This paper presents and analyzes the dependence of elasticity modulus (E) in pedunculate oak ( Quercus robur L.) and red oak ( Quercus rubra L.) from seasonal variations. Temperature range of E variation in the samples was -15°C -+35°C at the humidity of 65 to 45%. We used the following indices to assess mechanical resistance: RRB - relative resistance to bending, Pcr and mcr - critical permissible pressure and weight, Hcr - critical stem height. Our data testify that variations of elasticity modulus within the cycle of freezing - thawing are most of all affecting resistance of the trees with minimum correlation of the stem diameter to its height. Thus, as far as the investigated plant groups are concerned, Quercus robur L. and Quercus rubra L. undergrowth over 2 meters high and the thinnest suppressed adult trees are vulnerable to the risks of deformation and breaks under their own weight during temperature variations.

 механическая устойчивость модуль упругости Quercus robur L Quercus rubra L mechanical stability modulus of elasticity Quercus robur L Quercus rubra L

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