RUSSIAN JOURNAL OF FOREST SCIENCE, 2020, No. 3, P. 219–230

RESISTANCE FACTORS OF A SIBERIAN FIR TO POLYGRAPHUS PROXIMUS BARK BEETLE
N. M. Debkov¹, E. M. Bisirova^1,2
1Institute of Monitoring of Climatic and Ecological Systems, SB RAS
Academichesky ave 10/3, Tomsk, 634055, Russia
²All-Russian Center of Plants Quarantine, Tomsk branch
Frunze ave, 109A, Tomsk, 634069, Russia
E-mail: nikitadebkov@yandex.ru

Received 19 April 2018
The beginning of the XXI century was characterized by an increasing number of biological invasions. The biggest threat of them all poses the xylophilic entomophauna, that leads to the forest ecosystems overall degradation, especially in terms of biodiversity. Siberia currently suffers from Polygraphus proximus Blandf. (Ussuri polygraph beetle) invasion into Siberian fir forests (Abies sibirica Ledeb.). The goal of this research was to assess the factors contributing to the resistance of Siberian fir to Ussury polygraph beetle in West-Siberian invasion region. The major factors chosen were the following ones: tree’s age, trunk’s diameter, central rot presence, bark thickness and growth stress. The main reason for choosing those specific factors is their convenience for the express-test of fir forests resistance to the invader. As a result, a reliable difference was found in mean trunks diameter (Mann-Whitney, р = 0.0068 < 0.05), bark thickness (р = 0.0002 < 0.05) and growth stress (р = 0.0087 < 0.05) of affected and non-affected trees. Living trees in the breeding grounds of the invader usually have a larger trunk (>30 cm in diameter) and thicker bark (8-10 mm) while also having the lower growth stress (1.20). No significant differences were found in the age of affected trees (р = 0.9799 > 0.05). Central rot presence was also found to lack any significant correlation with the invader attacks (р = 0.1995 > 0.05), but in heavier affected forest stands trees with a central rot would be attacked by Ussuri polygraph more often than healthy ones. Sustainable communities usually are affected by central rot only slightly, and are characterized also by more significant age variation and stretched distribution of tree trunks’ by diameter and bark thickness.
Keywords: Siberian fir, Abies Sibirica, Ussuri polygraph beetle, Polygraphus proximus, xylophages invasions, forests resistance, Western Siberia
Acknowledgements: This study was carried out with a financial support from RFBR (16-44-700782 р-а).
DOI: 10.31857/S0024114820020059

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