1. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, P.R. China
2. Department of Criminal Science and Technology, Henan Police College, Zhengzhou 450046, P.R. China
3. Department of Ecosystem Science and Management, University of Wyoming, 1000 E. University Ave., Laramie, Wyoming 82071, United States
4. Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
5. Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
6. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P.R. China
7. Department of Crop and Soil Sciences, North Carolina State University, Raleigh, North Carolina 27695, United States
8. School of Earth Sciences, China University of Geosciences, Wuhan 430074, P.R. China
9. College of Science, Huazhong Agricultural University, Wuhan 430070, P.R. China