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Fig. 4. Soil organic C pool (SOC) means for three land use categories associated with: (a) soil orders, estimated using taxonomic approach and weighted by the area of each land use within suborders (A, E, H, I, M, and U stand for Alfisols, Entisols, Histosols, Inceptisols, and Ultisols, respectively), and (b) Major Land Resource Areas (MLRAs), estimated using the MLRA-taxonomic approach and weighted by the area of each land use within soil orders. The same letters following numbers indicate no significant differences between them at 
= 0.05. 
Actual heights of these bars for Histosols are reduced by a factor of 10 for easy graphing.
