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Fig. 2. Relationship between dissolved organic C and total organic C (TOC) for all land use in the Sanjiang Plain of northeast China. (a) The relationship between dissolved organic C and TOC in the whole soil profile. (b) The relationship between dissolved organic C and TOC in the topsoil (020 cm). (c) The relationship between dissolved organic C and TOC in the subsoil (2040 cm). Points in figure are means (n = 3). DOC is dissolved organic C. Soils at all sites were Hydric Medihemists.