Funding for this research was provided by:
National Natural Science Foundation of China (31770403, 31670390, 31570390)
Text and Data Mining valid from 2019-09-13
Received: 20 June 2019
Accepted: 4 September 2019
First Online: 13 September 2019
Ethics approval and consent to participate
: All sampling was approved by the forestry departments throughout China and were conducted following regulations of Wildlife Conservation of the People’s Republic of China (Chairman Decree  No. 24).
: Not applicable
: The authors declare that they have no competing interests.