School of Resources and Environment, Southwest University, Chongqing 400715, China;
School of Resources and Environment, Southwest University, Chongqing 400715, China;
School of Resources and Environment, Southwest University, Chongqing 400715, China;
School of Resources and Environment, Southwest University, Chongqing 400715, China;
School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China;
School of Resources and Environment, Southwest University, Chongqing 400715, China;
School of Resources and Environment, Southwest University, Chongqing 400715, China;