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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">sergeogr</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Российской академии наук. Серия географическая</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2587-5566</issn><issn pub-type="epub">2658-6975</issn><publisher><publisher-name></publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.1134/S2587556618060055</article-id><article-id custom-type="elpub" pub-id-type="custom">sergeogr-787</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>Эволюция природных систем</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Evolution of Natural System</subject></subj-group></article-categories><title-group><article-title>ФОРМИРОВАНИЕ МОРОЗОБОЙНЫХ ПОВРЕЖДЕНИЙ У ХВОЙНЫХ ДЕРЕВЬЕВ В РАЗЛИЧНЫЕ КЛИМАТИЧЕСКИЕ ПЕРИОДЫ НА ПОЛЯРНОМ УРАЛЕ</article-title><trans-title-group xml:lang="en"><trans-title>Formation of Frost Damages in Coniferous Trees in Different Climatic Periods on the Polar Ural Mountains</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>Гурская</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gurskaya</surname><given-names>M. A.</given-names></name></name-alternatives><email xlink:type="simple">mgurskaya@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт экологии растений и животных УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>19</day><month>12</month><year>2018</year></pub-date><volume>0</volume><issue>6</issue><fpage>70</fpage><lpage>80</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гурская М.А., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Гурская М.А.</copyright-holder><copyright-holder xml:lang="en">Gurskaya M.A.</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://izvestia.igras.ru/jour/article/view/787">https://izvestia.igras.ru/jour/article/view/787</self-uri><abstract><p>В горах Полярного Урала изучены частота повторяемости, интенсивность и пространственно-временное распределение морозобойных повреждений у ели и лиственницы, произрастающих в пределах одного склона юго-западной экспозиции на верхней границе распространения деревьев и на дне горной долины, с целью выявить пространственно-временную динамику их формирования в различные климатические периоды за последние 100 лет. На верхней границе леса повреждения формируются чаще у лиственницы по сравнению с елью, а на дне горной долины у лиственницы, напротив, повреждения формируются в два-три раза реже, чем у ели в одни и те же климатические периоды. Высокая частота формирования повреждений в ранней древесине хвойных приурочена к теплым климатическим периодам с ранним началом вегетации и небольшой высотой снега в мае. Выявлены наиболее экстремальные годы, когда повреждается большое количество деревьев, показано отличие от местообитаний, расположенных в Западной Сибири. Существует повышенный риск повреждений хвойных деревьев поздними весенними заморозками в связи с недавними изменениями климата на Полярном Урале.</p></abstract><trans-abstract xml:lang="en"><p>Frequency of recurrence, intensity and spatio-temporal distribution of frost damage in larch and spruce growing on the same southwest exposed slope at the upper tree-line and at the bottom of the mountain valley in the Polar Ural Mountains were studied with aim to reveal the dynamics of their formation in different climatic periods over the last 100 years. At the upper tree-line damages form more often in larch than in spruce, but at the bottom of the valley, on the contrary, damages form two-three times less frequently in larch than in spruce in the same climatic periods. The high frequency of damage formation in early wood is confined with warm climatic periods with early start of vegetation and low May snow depth. The most extreme years have been identified, when a large number of trees are damaged. The difference in frequency of frost damage formation with West Siberian has shown. Risk of a damage of coniferous trees by late spring frosts due to recent climate changes in the Polar Urals is increased.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>морозобойные повреждения</kwd><kwd>Полярный Урал</kwd><kwd>лиственница</kwd><kwd>ель</kwd><kwd>заморозки</kwd><kwd>древесно-кольцевые хронологии</kwd></kwd-group><kwd-group xml:lang="en"><kwd>frost damage</kwd><kwd>Polar Urals</kwd><kwd>larch</kwd><kwd>spruce</kwd><kwd>frost</kwd><kwd>tree-ring chronologies</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Автор благодарит В.С. Мазепу за ценные советы при написании рукописи. Работа выполнена при частичной поддержке грантов РФФИ № 14-04-91356 и 15-04-04933 и программы УрО РАН № 15-2-4-22.</funding-statement><funding-statement xml:lang="en">The author is grateful to V.S. Mazepa for valuable advices. This work was partly supported by the Russian Foundation for Basic Research, projects no. 14-04-91356 and 15-04-04933 and the program of the UrB RAS no. 15-2-4-22.</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">Барри Р.Г. Погода и климат в горах. Л.: Гидрометеоиздат, 1984. 312 с.</mixed-citation><mixed-citation xml:lang="en">Barri R.G. Pogoda i klimat v gorakh [Mountain Weather and Climate]. Leningrad: Gidrometeoizdat Publ., 1984. 312 p.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Ваганов Е.А., Шиятов С.Г., Мазепа В.С. Дендроклиматические исследования в Урало-Сибирской Субарктике // Новосибирск: СО РАН, 1996. 246 с.</mixed-citation><mixed-citation xml:lang="en">Vaganov Ye.A., Shiyatov S.G., Mazepa V.S. Dendroklimaticheskie issledovaniya v Uralo-Sibirskoi Subarktike [Dendroclimatic Studiesin the Ural-Siberian Subarctic]. Novosibirsk: SO RAN Publ., 1996. 246 p.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Гольцберг И.А. Агроклиматическая характеристика заморозков в СССР и методы борьбы с ними. Л.: Гидрометеоиздат, 1961. 217 с.</mixed-citation><mixed-citation xml:lang="en">Gol’tsberg I.A. Agroklimaticheskaya kharakteristika zamorozkov v SSSR i metody bor’by s nimi [Agroclimatic Characteristics of Frosts in the USSR and Methods of Their Control]. Leningrad: Gidrometeoizdat Publ., 1961. 217 p.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Гурская М.А., Шиятов С.Г. Распределение морозобойных колец в древесине хвойных деревьев // Экология. 2006. № 1. С. 1–8.</mixed-citation><mixed-citation xml:lang="en">Gurskaya M.A., Shiyatov S.G. Distribution of frost rings in coniferous trees. Russ. J. Ecol., 2006, no. 1, pp. 1–8. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Климат России / ред. Н.В. Кобышева. СПб.: Гидрометеоиздат, 2001. 655 с.</mixed-citation><mixed-citation xml:lang="en">Klimat Rossii [Climate of Russia]. Kobysheva N.V., Ed. St. Petersburg: Gidrometeoizdat Publ., 2001. 655 p.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Медведева М.А., Барталёв С.А., Лупян Е.А. и др. Возможности оценки момента наступления вегетационного сезона на основе спутниковых и метеорологических данных // Современные проблемы дистанционного зондирования земли из космоса. 2008. № 5. С. 313–321.</mixed-citation><mixed-citation xml:lang="en">Medvedeva M.A., Bartalev S.A., Lupyan Ye.A. et. al. Opportunities forestimations of vegetation period based on satellite and meteorological data. Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa, 2008, no. 5, pp. 313–321. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Раабен М.Е. Стратиграфия древних свит Полярного Урала // Стратиграфия и тектоническое строение северной оконечности Приполярного Урала. М.: ГИН АН СССР, 1959. 131 с.</mixed-citation><mixed-citation xml:lang="en">Raaben M.E. Stratigrafiya drevnikh svit Polyarnogo Urala. Stratigrafiya i tektonicheskoe stroenie severnoi okonechnosti Pripolyarnogo Urala [Stratigraphy of the Ancient Formations of the Polar Urals. Stratigraphy and Tectonic Structure of the Northern Extremity of the Subpolar Urals]. Moscow: GIN AN SSSR Publ., 1959. 131 p.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Урал и Приуралье: Природные условия и естественные ресурсы СССР // М.: Наука, 1968. 460 с.</mixed-citation><mixed-citation xml:lang="en">Ural and Priural’e: Prirodnye usloviya i estestvennye resursy SSSR [The Urals and the Pre-Urals: Natural Conditions and Natural Resources in the USSR]. Moscow: Nauka Publ., 1968. 460 p.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Хантемиров Р.М., Горланова Л.А., Шиятов С.Г. Патологические структуры в годичных кольцах можжевельника сибирского (Juniperus sibirica Burgsd.) и их использование для реконструкции экстремальных климатических событий // Экология. 2000. № 3. С. 185–192.</mixed-citation><mixed-citation xml:lang="en">Khantemirov R.M., Gorlanova L.A., Shiyatov S.G. Pathological structures of Juniper (Juniperus sibirica Burgsd.) and their using for climate extreme events reconstructions. Russ. J.Ecol., 2000, no. 3, pp. 185–192. (In Russ.).</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Хромов С.П. Метеорология и климатология. Л.: Гидрометеоиздат, 1968. 456 с.</mixed-citation><mixed-citation xml:lang="en">Khromov S.P. Meteorologiya i klimatologiya [Meteorology and Climatology]. Leningrad: Gidrometeoizdat Publ., 1968. 456 p.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Чудновский А.Ф. Заморозки. Л.: Гидрометеоиздат, 1949. 124 с.</mixed-citation><mixed-citation xml:lang="en">Chudnovskii A.F. Zamorozki [Frosts]. Leningrad: Gidrometeoizdat Publ., 1949. 124 p.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Augspurger C.K. Frost damage and cascading negative effects on Aesculus glabra // Plant Ecology. 2011. № 212. P. 1193–1203.</mixed-citation><mixed-citation xml:lang="en">Augspurger C.K. Frost damage and cascading negative effects on Aesculus glabra. Plant Ecol., 2011, no. 212, pp. 1193–1203.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Augspurger C.K. Reconstructing patterns of temperature, phenology, and frost damage over 124 years: spring damage risk is increasing // Ecology. 2013. № 94(1). P. 41–50.</mixed-citation><mixed-citation xml:lang="en">Augspurger C.K. Reconstructing patterns of temperature, phenology, and frost damage over 124 years: spring damage risk is increasing. Ecology, 2013, no. 94 (1), pp. 41–50.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Briffa K., Jones P., Schweingruber F., Osborn T. Influence of volcanic eruptions on Northern Hemisphere summer temperature over the last 600 years // Nature. 1998. № 393. P. 450–455.</mixed-citation><mixed-citation xml:lang="en">Briffa K., Jones P., Schweingruber F., Osborn T. Influence of volcanic eruptions on Northern Hemisphere summer temperature over the last 600 years. Nature, 1998, no. 393, pp. 450–455.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Briffa K.R., Osborn T.J., Schweingruber F.H., Jones Ph.D., Shiyatov S.G., Vaganov E.A. Tree-ring width and density data around the Northern Hemisphere: Part 2. Spatio-temporal variability and associated climate patterns // The Holocene. 2002. № 12(6). P. 759–789.</mixed-citation><mixed-citation xml:lang="en">Briffa K.R., Osborn T.J., Schweingruber F.H., Jones Ph.D., Shiyatov S.G., Vaganov E.A. Tree-ring width and density data around the Northern Hemisphere: Part 2, spatio-temporal variability and associated climate patterns. The Holocene, 2002, no. 12(6), pp.759–789.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Cannell M.G.R. Analysis of risks of frost damage to forest trees in Britain. In Crop Physiology of Forest Trees / Tigerstedt P.M.A., Tigerstedt M.A., Puttonen P., and Koski V. (Ed). Helsinki: Helsinki Univ. Press, 1985. P. 153–166.</mixed-citation><mixed-citation xml:lang="en">Cannell M.G.R. Analysis of risks of frost damage to forest trees in Britain. In Crop Physiology of Forest Trees. Tigerstedt P.M.A., Puttonen P., and Koski V., Eds. Helsinki: Helsinki Univ. Press, 1985, pp. 153–166.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Glerum C., Farrar J.L. Frost ring formation in the stem of some coniferous species // Canad. J. Bot. 1966. № 44(7). P. 879–886.</mixed-citation><mixed-citation xml:lang="en">Glerum C., Farrar J.L. Frost ring formation in the stem of some coniferous species. Canad. J. Bot., 1966, no. 44 (7), pp. 879–886.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Gurskaya M.A. Temperature Conditions of the Formation of Frost Damages in Conifer Trees in the High Latitudes of Western Siberia // Biology Bulletin. 2014. № 41(2). P. 187–196.</mixed-citation><mixed-citation xml:lang="en">Gurskaya M.A. Temperature conditions of the formation of frost damages in conifer trees in the high latitudes of Western Siberia. Biol. Bull., 2014, no. 41(2), pp. 187–196.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Gurskaya M.A., Shiyatov S.G. Formation of Two Xylem Frost injuries in One Annual Ring in Siberian spruce under Conditions of Western Siberian forest-tundra // Russian J. of Ecology. 2002. № 33(2). P. 73–79.</mixed-citation><mixed-citation xml:lang="en">Gurskaya M.A., Shiyatov S.G. Formation of Two Xylem Frost injuries in One Annual Ring in Siberian spruce under Conditions of Western Siberian foresttundra. Russ. J.Ecol., 2002, no. 33(2), pp. 73–79.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Gurskaya M., Moiseev P., Wilmking M. Does slope exposure affect frost ring formation in Picea obovata growing at treeline in the Southern Urals? // Silva fennica. 2016. № 3. 1560 p.</mixed-citation><mixed-citation xml:lang="en">Gurskaya M., Moiseev P., Wilmking M. Does slope exposure affect frost ring formation in Picea obovata growing at treeline in the Southern Urals? Silva Fennica, 2016, vol. 50, no. 3, id 1560.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Filion L., Payette S., Gauthier L., Boutin Y. Light rings in sub-arctic conifers as a dendrochronological tool // Quat. Res. 1986. № 26. P. 272–279.</mixed-citation><mixed-citation xml:lang="en">Filion L., Payette S., Gauthier L., Boutin Y. Light rings in sub-arctic conifers as a dendrochronological tool. Quat. Res., 1986, no. 26, pp. 272–279.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Hänninen H. Climate warming and the risk of frost damage to boreal forest trees: identification of critical ecophysiological traits // Tree Physiology. 2006. № 26. P. 889–898.</mixed-citation><mixed-citation xml:lang="en">Hänninen H. Climate warming and the risk of frost damage to boreal forest trees: identification of critical ecophysiological traits. Tree Physiol., 2006, no. 26, pp. 889–898.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Holmes R.L. Computer-assisted quality control in treering dating and measurement // Tree-Ring Bulletin. 1983. № 43. P. 69–78.</mixed-citation><mixed-citation xml:lang="en">Holmes R.L. Computer-assisted quality control in tree-ring dating and measurement. Tree-Ring Bull., 1983, no. 43, pp. 69–78.</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Inouye D.W. The ecological and evolutionary significance of frost in the context of climate change // Ecology Letters. 2000. № 3. P. 457–463.</mixed-citation><mixed-citation xml:lang="en">Inouye D.W. 2000. The ecological and evolutionary significance of frost in the context of climate change. Ecol. Lett., 2000, no. 3, pp. 457–463.</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">IPCC 2013: Climate change 2013: the physical science basis. Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change / Stocker T.F., Qin D., Plattner G.K., Tignor M., Allen S.K., Boschung J., Nauels A., Xia Yu., Bex V., and Midgley B.M. (Ed). Cambridge, New York: Cambridge Univ. Press, 2013. 1535 p.</mixed-citation><mixed-citation xml:lang="en">IPCC 2013: Сlimate change 2013: the physical science basis. Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change. Stocker T.F., Qin D., Plattner G.K., Tignor M., Allen S.K., Boschung J., Nauels A., Xia Yu., Bex V., and Midgley B.M., Eds. Cambridge, New York: Cambridge Univ. Press, 2013. 1535 p.</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">IPCC-2012 SREX Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation. A Special Report of Working Groups I and II of the Intergovernmental Panel on Climate Change / Field C.B., Barros V., Stocker T.F., Qin D., Dokken D.J., Ebi K.L., Mastrandrea M.D., Mach K.J., Plattner G.-K., Allen S.K., Tignor M., and Midgley M. (Ed). Cambridge, New York: Cambridge Univ. Press. 2012. P. 1–19.</mixed-citation><mixed-citation xml:lang="en">IPСС-2012 SREX Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation. A Special Report of Working Groups I and II of the Intergovernmental Panel on Climate Change. Field C.B., Barros V., Stocker T.F., Qin D., Dokken D.J., Ebi K.L., Mastrandrea M.D., Mach K.J., Plattner G.-K., Allen S.K., Tignor M., and Midgley M., Eds. Cambridge, New York: Cambridge Univ. Press, 2012, pp. 1–19.</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">LaMarch V.C., Hirschboeck K.K. Frost rings in trees as records of major volcanic eruptions // Nature. 1984 307. P. 121–126.</mixed-citation><mixed-citation xml:lang="en">LaMarch V.C., Hirschboeck K.K. Frost rings in trees as records of major volcanic eruptions. Nature, 1984, no. 307, pp. 121–126.</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Marchand N., Filion L. False rings in the white pine (Pinus strobus) of the Outaouais Hills, Québec (Canada), as indicators of water stress // Can. J. For. Res. 2012. № 42. P. 12–22.</mixed-citation><mixed-citation xml:lang="en">Marchand N., Filion L. False rings in the white pine (Pinus strobus) of the Outaouais Hills, Québec (Canada), as indicators of water stress. Canad. J. For. Res., 2012, no. 42, pp. 12–22.</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Rinn F. TSAP Time Series Analysis and Presentation. Ver. 3.0. Reference Manual. Heidelberg, 1996. 262 p.</mixed-citation><mixed-citation xml:lang="en">Rinn F. TSAP Time Series Analysis and Presentation. Version 3.0. Reference Manual. Heidelberg, 1996. 262 p.</mixed-citation></citation-alternatives></ref><ref id="cit30"><label>30</label><citation-alternatives><mixed-citation xml:lang="ru">URL. www.meteo.ru.</mixed-citation><mixed-citation xml:lang="en">Available at: www.meteo.ru (accessed 13.09.2018).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
