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Fig. 2. Experimental and fitted semivariograms of (A) soil pH in 0.9 to 1.0 m layers (exponential model: sill = 0.365, range = 937 m), (B) organic carbon content in Ap horizons (spherical model: nugget = 0.053, partial sill = 0.154, range = 2192 m), and (C) Cd loads (exponential model: nugget = 0.145 mg² m^–2, partial sill = 0.219 mg² m^–2, range = 429 m). Organic carbon contents (% by mass) and Cd loads were log-transformed before analysis.

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