Aakala, T. (corresponding author, firstname.lastname@example.org) & Kuuluvainen, T. (email@example.com): Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Helsinki, Finland Wallenius, T. (firstname.lastname@example.org): Kolari Unit, Finnish Forest Research Institute, Muoniontie 21A, FI-95900, Kolari, Finland, Vantaa Unit, Finnish Forest Research Institute, P.O. Box 18, FI-01301, Vantaa, Finland Kauhanen, H. (email@example.com): Kolari Unit, Finnish Forest Research Institute, Muoniontie 21A, FI-95900, Kolari, Finland
Tree mortality episodes in the intact Picea abies-dominated taiga in the Arkhangelsk region of northern European Russia
Article first published online: 17 JAN 2011
© 2011 International Association for Vegetation Science
Journal of Vegetation Science
Volume 22, Issue 2, pages 322–333, April 2011
How to Cite
Aakala, T., Kuuluvainen, T., Wallenius, T. and Kauhanen, H. (2011), Tree mortality episodes in the intact Picea abies-dominated taiga in the Arkhangelsk region of northern European Russia. Journal of Vegetation Science, 22: 322–333. doi: 10.1111/j.1654-1103.2010.01253.x
Co-ordinating Editor: Helge Bruelheide
- Issue published online: 2 MAR 2011
- Article first published online: 17 JAN 2011
- Received 16 March 2010, Accepted 14 December 2010
- Abiotic disturbances;
- Bark beetle;
- Disturbance dynamics;
- Forest dynamics
Question: What were the temporal patterns and rates of tree mortality in a recent episodic tree mortality event? Have similar events occurred in the past, and does climatic variability play a role in the disturbance regime?
Location: Intact Picea abies-dominated taiga in the Arkhangelsk region, northwestern Russia.
Methods: We reconstructed the past tree mortality and disturbance history by applying dendroecological methods in five forest stands and related these to climatic data. The role of other potential causes of tree mortality was assessed in a field inventory.
Results: The recent episode lasted from 1999 to 2004, influenced all stands studied, and killed on average 21% of trees with a diameter of over 10 cm at 1.3-m height. The annual tree mortality rate in the decades preceding this episode was 0.49%. During the past 200 years, the stands have experienced chronic small-scale disturbances, with several irregular disturbances of moderate severity. The recent episode was associated with abundant signs of the bark beetle Ips typographus. Furthermore, the timing of both the recent tree mortality episode and the past disturbance events was associated with dry summers.
Conclusion: The results indicate a connection between climatic variability and forest dynamics, the likely driving factors being droughts and bark beetles. In the context of the past 200 years, the recent episode was potentially at the higher end of the range of disturbance variability in terms of severity and spatial extent. This has ecological implications in a changing climate, potentially influencing ecosystem structure and long-term dynamics.