Аннотация:The chapter considers geostatistical parameters of variation in pH values (in the aqueous and saline extracts) and organic carbon content in the zonal series of the Russian plain soils: gray soils (Greyic Phaeozems), illuvial clay chernozerms (Luvic Chernozems), chernozerms (Glossic Chernozems) and chestnut soils (Kastanozems). Zonal patterns are shown to exist in the variation of the above soil properties: the correlation radius of acidity fluctuations increases north to south whilst spatial coherence grows weaker; the period of organic carbon content fluctuations grows longer. At the same time, many parameters demonstrate regional or local characteristics. More studies are needed to successfully extrapolate geostatistical models onto unsurveyed areas.