1 Department of Pedology and Soil Environment, Faculty of Environmental Science, VNU University of Science, Vietnam National University, 334-Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam. Electronic address: minhnn@hus.edu.vn.
2 Leibniz Universität Hannover, Herrenhäuser Straße 2, 30419, Hannover, Germany.
3 School of Public and Environmental Affairs, Indiana University, MSBII, Room 418 N. Walnut Grove Ave, Bloomington, IN, 47405-2204, USA.
4 Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Viet Nam.
5 Department of Pedology and Soil Environment, Faculty of Environmental Science, VNU University of Science, Vietnam National University, 334-Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam.
6 Department of Geological Sciences, Indiana University, 1001 East 10th Street, Bloomington, IN, 47405-1405, USA.