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Four-Eyed Fir Bark Beetle Influence on the Ontogenetic Structure of Fir Forests in Western Siberia

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N.M. Debkov

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The problem of insect invasion in forest ecosystems is world-wide. The article considers the influence of four-eyed fir bark beetle (Polygraphus proximus Blandf.) on the ontogenetic structure of Siberian fir (Abies sibirica Ledeb.) forests. The studies were held in West Siberian invasion source in 2016–2017. It had been founded that plantations with a left-sided ontoge-netic structure are least vulnerable to the influence of four-eyed fir bark beetle. Fir forests with a right-sided ontogenetic structure are more vulnerable and degrade rapidly almost without any exception. Plantations with a mixed ontogenetic structure are in-between. It was registered that fir forests with post-generative type of trees and forest communities, which consist of more than 30–40 % of trees in post-generative ontogenetic condition, have high resistance. It is shown that there is a single mode of action of four-eyed fir bark beetle invasion of plantations of all ontogenetic structure types, which primarily aims to attack the late virginal and young generative firs. Over the time, these trees will fall out of forest communities and middle-aged and old generative trees will have an extensive damage. Significant mortality of early virginal firs (up to 50 %) is observed during mass reproduction that leads to the effect of artificial reju-venation of undergrowth and reduction of its morphological features.


N.M. Debkov, Candidate of Agricultural Sciences, Research Scientist


Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, pr. Akademicheskiy, 10/3, Tomsk, 634055, Russian Federation; 


Siberian fir Abies sibirica Ledeb., four-eyed fir bark beetle Polygraphus proxi-mus Blandf., ontogenetic structure, invasion, Western Siberia

For citation

Debkov N.M. Four-Eyed Fir Bark Beetle Influence on the Ontogenetic Struc-ture of Fir Forests in Western Siberia. Lesnoy Zhurnal [Forestry Journal], 2018, no. 5, pp. 116–125. DOI: 10.17238/issn0536-1036.2018.5.116


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Received on October 13, 2017

Four-Eyed Fir Bark Beetle Influence on the Ontogenetic Structure of Fir Forests in Western Siberia


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