1. College of Natural Resources and Environment; Northwest A&F University; Yangling Shaanxi 712100 China
2. Key Laboratory of Plant Nutrition and Agro-environment in Northwest China; Ministry of Agriculture; Yangling Shaanxi 712100 China
3. School of Resources and Environmental Engineering; Wuhan University of Technology; Wuhan Hubei 430070 China
4. Faculty of Science and Information Technology, Global Centre for Environmental Remediation; University of Newcastle; Callaghan New South Wales 2308 Australia
5. College of Life Sciences; Northwest A&F University; Yangling Shaanxi 712100 China