Funding for this research was provided by:
Humanities and Social Sciences planning funds project under the Ministry of Education of the PRC (17YJCZH047)
Beijing Municipal Natural Science Foundation (9174041)
the fund from Key Laboratory of Carrying Capacity Assessment for Resource and Environment (CCA2017.11)
National Natural Science Foundation of China (41871202)
Article History
Received: 5 January 2018
Accepted: 8 September 2018
First Online: 15 September 2018