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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.