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Fig. 3. Proportion of labile fraction organic C to total organic C (TOC) through the soil profile in the Sanjiang Plain of northeast China. (a) The proportion of dissolved organic C to TOC through the soil profile; (b) The proportion of microbial biomass C to TOC through the soil profile; (c) The proportion of hot water-extractable C to TOC through the soil profile. Points in figure are means (n = 3). Points in each figure with the same letter are not significantly different at p < 0.05. DOC/TOC is the proportion of dissolved organic C to TOC; MBC/TOC is the proportion of microbial biomass C to TOC; HWC/TOC is the proportion of hot water-extractable C to TOC. Soils at all sites were Hydric Medihemists.
