gher proportion of gram-negative bacteria.
The change of surface functional groups induced by biochar resulted
in increased substrate bioavailability in acid soils. After biochar amendment,
aromatic C_C and C_O groups strongly increased in DOC, indicating
the existing of dissolved aromatic compound (Qian and Chen,
2014) by biochar. Furthermore, Due to labile fraction as carbon source
in dissolved biochar, stronger resolved band of C\O at 1168 cm−1
and peaks centered around 1040 cm−1 as indicative of cellulosic material
(Li et al., 2014) were also observed after biochar amendment in
acidic soils (Fig. 6b, Fig. S6a).