Funding for this research was provided by:
Zhejiang Province – Chinese Academy of Forestry joint-supported Forestry Science and Technology Program (2018SY03)
Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX17_0819)
Text and Data Mining valid from 2020-02-06
Received: 14 October 2019
Accepted: 30 January 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: No permissions were required for the field surveys.
: Not applicable.
: The authors declare that they have no competing interests.