Funding for this research was provided by:
National Natural Science Foundation of China (61663023)
Key Research Programs of Science and Technology Commission Foundation of Gansu Province (2017GS10817)
Lanzhou Science Bureau project (2018-rc-98)
Natural Science Foundation of Fujian Province (LGJ19E050001)
Institute of Climate Change and Public Policy (G20170016)
Article History
Received: 18 June 2019
Revised: 11 December 2019
Accepted: 25 December 2019
First Online: 11 January 2020