Funding for this research was provided by:
National Natural Science Foundation of China (41701583)
Hainan Provincial Natural Science Foundation of China (2020RC096)
Academy-Locality Cooperation Project of Sanya (2019YD4)
Open Fund of State Key Laboratory of Urban and Regional Ecology in China (SKLURE2016-2-6)
Received: 23 July 2020
Accepted: 16 January 2021
First Online: 27 January 2021
Compliance with ethical standards
: The authors declare that there are no conflicts of interest.
: Not applicable.