Funding for this research was provided by:
Sichuan Science and Technology Program (2018JY0527)
Key Achievement Conversion Projects in Neijiang Normal University (17CZ03)
Bingwei Excellent Tallents Program of Institute of Geographic Sciences and Natural Resources Research (2017RC203)
Article History
Received: 11 May 2019
Accepted: 6 December 2019
First Online: 6 January 2020