Funding for this research was provided by:
National Natural Science Foundation of China (31570614)
Forestry Science and Technology Innovation Project of Shandong Province (2019LY009)
Key Research and Development Program of Shandong Province (2019GNC106081)
Received: 23 August 2020
Accepted: 24 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This article does not contain any studies with human participants or animals performed by any of the authors.
: All authors agree with the contents of the manuscript and its submission to the journal.
: The authors declare that they have no competing interests.