Kunming University of Science and Technology, affiliation not provided to SSRN, Kunming University of Science and Technology, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Kunming University of Science and Technology, Yunnan Ecological Environment Monitoring Center, affiliation not provided to SSRN, Kunming University of Science and Technology and Kunming University of Science and Technology - Faculty of Environmental Science and Engineering