Fig. 3. (a) Short-range semivariogram of organic carbon (OC) from 360 samples of a nested survey in southern Brittany and (b) its corresponding random function (RF) [Y₁(x)]; (c) representation of a linear model of OC as a function of the redoximorphic index (HI) used to derive (d) the medium-range spatial field [Y₃(x)]; (e) long-range semivariogram of OC based on 40 000 regional samples in Brittany, and (f) its simulated RF [Y₂(x)].

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