[2] Warnock D D, Lehmann J, Kuyper T W, et al. Plant and Soil, 2007, 300(1-2): 9.
[5] Cao Xinde, Harris W. Bioresource Technology, 2010, 101(14): 5222.
[6] Chan K Y, Zwieten L V, Meszaros I, et al. Australian Journal of Soil Research, 2007, 45: 629.
[7] Wu W, Yang M, Feng Q, et al. Biomass. Bioenerg., 2012, 47: 268.