Funding for this research was provided by:
The State Research Programme of the Forest Research Institute of the Karelian Research Centre, Russian Academy of Sciences
Received: 8 October 2019
Accepted: 12 December 2019
First Online: 17 January 2020
Ethics approval and consent to participate
: Not applicable
: The authors consent to publish the data included in this paper.
: The authors declare that they have no competing interests.