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Fig. 6. Relationship between hot water-extractable C and total organic C (TOC) for all land use in the Sanjiang Plain of northeast China. (a) The relationship between hot water-extractable C and TOC in the whole soil profile. (b) The relationship between hot water-extractable C and TOC in the topsoil (0–20 cm). (c) The relationship between hot water-extractable C and TOC in the subsoil (20–40 cm). Points in figure are means (n = 3). HWC is hot water-extractable C. Soils at all sites were Hydric Medihemists.
