1. College of Natural Resources and Environment; State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
2. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
3. Shanghai Environmental Sanitation Engineering Design Institute Co., Ltd., Shanghai 200232, China
4. Program for the Environment and Sustainability, Department of Occupational and Environmental Health, School of Public Health, Texas A&M University, College Station, Texas 77843, United States