1. Research Assistant, Chongqing Key Lab of Agricultural Resources and Environment, College of Resources and Environment, Southwest Univ., Chongqing 400715, China (corresponding author).
2. Research Assistant, Chongqing Key Lab of Agricultural Resources and Environment, College of Resources and Environment, Southwest Univ., Chongqing 400715, China.
3. Professor, Chongqing Key Lab of Agricultural Resources and Environment, College of Resources and Environment, Southwest Univ., Chongqing 400715, China.