Fig. 4From: Linkage of microbial living communities and residues to soil organic carbon accumulation along a forest restoration gradient in southern ChinaVariations of total microbial residue-C (AS-C, panel A), fungal residue-C (GluN-C, panel B), and bacterial residue-C (MurA-C, panel C) in SOC following forest restoration. Different uppercase and lowercase letters indicate significant differences in topsoil (grey bar) or subsoil (white bar) between the four restoration stages at the P < 0.05 level. Bars represent means ± SE (n = 6)Back to article page