The School of Economics and Management of China University of Geosciences, Hubei, Wuhan 430074/Rural Development Institute Chinese Academy of Social Sciences, Beijing, 100732
The School of Economics and Management of China University of Geosciences, Hubei, Wuhan 430074
Copyright © Jiangyi Liu, Shengbang Song et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.