1. Nanjing Institute of Environmental Sciences; Ministry of Environmental Protection; Nanjing 210042 China
2. Department of Agricultural Sciences; La Trobe University; Melbourne Campus Bundoora Vic. 3086 Australia
3. State Key Laboratory of Soil and Sustainable Agriculture; Institute of Soil Science; Chinese Academy of Sciences; Nanjing 210008 China
4. Department of Export Agriculture, Faculty of Animal Science and Export Agriculture; Uva Wellassa University; Badulla 9000 Sri Lanka
5. New Zealand Biochar Research Centre; Institute of Natural Resources; Massey University; Palmerston North 4442 New Zealand