《Table 3 P-values of the accuracy improvement of the soil map updated with the proposed method and w

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《Updating conventional soil maps by mining soil–environment relationships from individual soil polygons》

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*and**indicate the accuracy improvement is statistically significant at the 0.05 and 0.01 level，respectively.

Next，the step functions of the relationships between map units and their corresponding parent materials were constructed as described in Section 2.3.And the decomposed step function between a complex map unit and each of its corresponding parent material was also constructed.The result is 17 pairs of map unit–parent material（i.e.，step functions）（Table 1；Fig.8） .The area covered by these 17 pairs of map unit–parent material accounts for 88.9%of the total area.The rest area contains either border polygons or combinations between soils and parent materials that are not typical for the soils and thus considered to be unreasonable and excluded from the steps below.