1 Biochar Engineering Technology Research Center of Guangdong Province, School of Environment and Chemical Engineering, Foshan University, Foshan, 528000, Guangdong, China. hailong.wang@fosu.edu.cn.
2 Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea.
3 Department of Renewable Resources, University of Alberta, Edmonton, Canada.
4 College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China.