Funding for this research was provided by:
the National Key Research and Development Program of China, the project of ‘Source Identification and Contamination Characteristics of Heavy Metals in Agricultural Land and Products (2016YFD0800300)
Natural Science Foundation of China (41721002)
Article History
Received: 9 December 2019
Revised: 16 January 2020
Accepted: 3 March 2020
First Online: 9 March 2020