《Table 2 Semi-quantitative analysis of soil clay content in 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:Sme，smectite；Ill，illite；Chl，chlorite；Ver，vermiculite；Kao，kaolinite；Pal，palygorskite；Ill-Sme，illite-smectite；–，trace or not detected；+，content<15%；++，content in the range of 15%–30%；+++，content in the range of 30%–50%；++++，content>50%.

Relative abundance of clay fractions in the studied soils is shown in Table 2.Smectite，chlorite，illite，palygorskite，vermiculite，kaolinite and interstratified illite-smectite were the dominant clay minerals in the clay samples.The main clay minerals were illite，chlorite and palygorskite in the west and south of Kohgiluyeh and Boyer-Ahmad Province，whereas they were smectite，vermiculite and illite in the north and east of the province.Although illite and chlorite were found in almost all surface and subsurface pedons，they were the major clay minerals in low developed pedons of steep relief，alluvial deposit and regions with low precipitation.In almost all pedons（except some Entisoils），illite mineral showed a decreasing trend with increasing depth，mostly due to the enriched sources of illite from the surrounding areas.Because of the inheritance origin and transportation of illite by erosion and aeolian to surface soils，and also the alteration from biotite in surface soils due to daily and seasonal variations in moisture and temperature，illite decreased with increasing soil depth（Khormali and Abtahi，2003）.Alteration of illite to smectite occurred mostly in surface soils of Alfisols and other soils in humid regions，and since smectite was present in fine fraction，therefore contrary to illite，it moved and deposited into the subsurface horizon.Chlorite showed an independent behavior with soil depth and climate.Illite and chlorite are of hereditary origin.Kaolinite occurred in tropical conditions and its origin in the study area was inherited from the surrounding formations and sediments.Except for pedons 12，13，15，17，46，47 and 49 which were derived from Gachsaran formation（the most important cap rock of hydrocarbon reservoir in Iran and has important deposits of salt，sulfur and gypsum），other pedons have shown some kaolinite in their clay fraction.