1 Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan. Electronic address: yhs@ntu.edu.tw.
2 Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung, Taiwan. Electronic address: lien.sam@nuk.edu.tw.
3 Department of Civil, Environmental, and Construction Engineering, Texas Tech University, Box 41023, Lubbock, TX 79409-1023, USA. Electronic address: weile.yan@ttu.edu.
4 School of Natural Resources and Environmental Science & Korea Biochar Research Center, Kangwon National University, Chuncheon 24341, South Korea. Electronic address: soilok@kangwon.ac.kr.