《Table 1 Soil characteristics of the studied pedons》

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《"Potassium forms in calcareous soils as affected by clay minerals and soil development in Kohgiluyeh and Boyer-Ahmad Province, Southwest Iran"》

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Note:SP，saturation percentage；EC，electrical conductivity；CCE:calcium carbonate equivalent；OC，organic carbon；CEC，cation exchangeable capacity；Tr，trace.A，surface horizon；B，subsoil；C，substratum；A/B，transitional horizon；k，accumulation of secondary ca

Soil classification of the studied pedons according to the U.S.Soil Taxonomy（Soil Survey Staff，2014）is shown in Table 1.Soils were classified into 5 orders，including Entisols，Inceptisols，Mollisols，Alfisols and Vertisols.Soils with argillic horizon（pedons 38，42，44，45，49，51 and 52）were developed mostly in the east and northeast of Kohgiluyeh and Boyer-Ahmad Province with high precipitation，although few developed soils（pedons 2，7，23 and 33）were also observed in other regions with low precipitation.The formation of argillic horizon in this region may be due to the process of dealkalization and steppification in the past（Abtahi，1977）.Soils with argillichorizon were classified into Calcidic Haplustalfs，Calcic Haploxeralfs，Mollic Haploxeralfs，Calcidic Argiustolls and Pachic Argixerolls.The forming processes of these soils mainly occur in piedmont plains and plateaus.Due to high precipitation，these soils are less calcareous，especially in the east and northeast of the province.Because of highly calcareous parent materials and low precipitation in the west and south of the study area，the main horizon is calcic，with accumulation of nodules and powdery pockets of carbonate（pedons 2，3，5，7，23，26，33 and 35 in the western and southern regions and pedons 49 and 52 in the eastern region）.Gypsic horizon was found only in the driest area near Gachsaran geological formation（formation with high gypsum content），such as pedons 12，13 and 15.Cambic horizon was seen as the ordinary horizon in poor developed soils like Inceptisols（Pedon 30）and Mollisols（pedons 1 and 36）.Ochric epipedon occurred in all soils of the study area with an exception of Mollisols.Mollic epipedon in pedons 1，2，36，38，and 46 had high OC content and developed structure.Entisols are soils without developed horizon that have been spread in alluvial plains and alluvial fans in all regions.