Funding for this research was provided by:
National Science Foundation for Young Scientists of China (51709251)
National Key Research and Development Program of China (2016YFC0501304, 2016YFC0501305)
Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. QYZDJ-SSW-DQC028)
Scientific Research Project for Geographic Science and Natural Resources Research, Chinese Academy of Science (Y6V60216YZ)
Article History
Received: 10 July 2018
Revised: 23 March 2019
Accepted: 25 April 2019
First Online: 7 May 2019