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Published online 27 February 2006
Published in Soil Sci Soc Am J 70:660-667 (2006)
DOI: 10.2136/sssaj2005.0007
© 2006 Soil Science Society of America
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Land Use Effects on the Distribution of Labile Organic Carbon Fractions through Soil Profiles

Zhang Jinboa,b,*, Song Changchuna and Yang Wenyana,b

a Northeast Institute of Geography and Agric. Ecology, Chinese Academic Science, Changchun Jilin, 130012, China
b Graduate School of Chinese Academic Science, Beijing, 10039, China


Figure 1
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  		Fig. 1. The distribution of observation sites in this study. C9 is a field cultivated for 9 yr, C15 is a field cultivated for 15 yr, A is a field that was abandoned for 6 yr after being cultivated for 10 yr, U is upland forest, D is Deyeuxia angustifolia wetland. All study sites are contiguous within 800 m. The C-horizon is quaternary period sediment. Soils at all sites were Hydric Medihemists.

 

Figure 2
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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 (0–20 cm). (c) The relationship between dissolved organic C and TOC in the subsoil (20–40 cm). Points in figure are means (n = 3). DOC is dissolved organic C. Soils at all sites were Hydric Medihemists.

 

Figure 3
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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.

 

Figure 4
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  		Fig. 4. Relationship between microbial biomass C and total organic C (TOC) for all land use in the Sanjiang Plain of northeast China. (a)The relationship between microbial biomass C and TOC in the whole soil profile. (b)The relationship between microbial biomass C and TOC in the topsoil (0–20 cm). (c) The relationship between microbial biomass C and TOC in the subsoil (20–40 cm). Points in figure are means (n = 3). MBC is microbial biomass C. Soils at all sites were Hydric Medihemists.

 

Figure 5
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  		Fig. 5. Relationship between dissolved organic C, microbial biomass C and hot water-extractable C in the Sanjiang Plain of northeast China. (a) The relationship between dissolved organic C and microbial biomass C; (b) The relationship between dissolved organic C and hot water-extractable C; (c) The relationship between hot water-extractable C and microbial biomass C. Points in figure are means (n = 3). HWC = hot water-extractable C; MBC = microbial biomass C; DOC = dissolved organic C. Soils at all sites were Hydric Medihemists.

 

Figure 6
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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.

 




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