中文摘要：

Jilian Hu, Ph.D., professor of College of Economics and Management, Shandong Agricultural University; main research field： natural resource economics; address： College of Economics and Management, Shandong Agricultural University, Tai＇an, Shandong, China, postcode： 271018. Yanxiang Ge, Ph.D., professor of College of Economics and Management, Shandong Agricultural University; main research field： natural resource economics; address： College of Economics and Management, Shandong Agricultural University, Tai＇an, Shandong, China, postcode： 271018. Xiaoli Ma, Ph.D. candidate of College of Economics and Management, Shandong Agricultural University; main research field： natural resource economics; address： College of Economics and Management, Shandong Agricultural University, Tai＇an, Shandong, China, postcode： 271018.