Siberian Federal University

Issue

Journal of Siberian Federal University. Biology. 2012 5 (1)

Authors

Koltunov, Evgeny V.

Contact information

Koltunov, Evgeny V. : Botanical Garden of Ural Branch of RAS , 8 March St., 202a, Ekaterinburg, 620144 Russia , e-mail:

Keywords

abiotic stress; dendrochronology; forest; phytophagous insects; outbreaks

Abstract

The mechanisms of forest insect population dynamics, forming the periodic outbreaks are studied with dendrochronological methods. It has been established that forest stands considerably differ on level of reaction to the abiotic stress factor (drought). We presented the different reaction on the abiotic stress produced and different level of the temporary entomoresistance decreasing. The most intensive stress reaction initiated the lowest trees entomoresistance. Its accompanied with intensive defoliation and vice versa. The population dynamics factors rank structure was suggested and the mechanisms of population dynamics were discussed. The first rank factor presented abiotic factor (spring-summer drought). It provided the stress effect on the trees. The second rank factor was phytocenotic and it provided low resistance trees stress reaction. Its accompanied by considerable changes of leaves and needle biochemical characteristics. These changes improved their forage value. The third rank factor was presented by population factor, i.e. a genetically determinate high biotic (flash) potential of the phytophagous insects. This potential provides a fast adaptation mechanism to the biochemical characteristics changes of leaves and needles.

Pages

52-69

Paper at repository of SibFU

https://elib.sfu-kras.ru/handle/2311/3007

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).