1. Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, and Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058 Zhejiang, China
2. Institute of Environment Remediation and Human Health, and College of Ecology and Environment, Southwest Forestry University, Kunming 650224 Yunnan, China
3. Department of Soils, Water and Agricultural Engineering, Sultan Qaboos University, P. O. Box 34, Al-Khoud, 123 Muscat, Oman