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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2001 , Volume - , Number (Special Issue); Page(s) 120 To 138.
 
Paper: 

GENESIS, CLASSIFICATION AND MINERALOGICAL COMPOSITION OF SELECTED CALCAREOUS AND GYPSIFEROUS SOILS IN THE SALAFCHEGAN PLAIN, QOM PROVINCE

 
 
Author(s):  EFTEKHARI K., MAHMOODI SH.
 
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Abstract: 

Genesis, classification, and mineralogical characteristics of the soils of Salafchegan area in Qom province were studied and the results obtained from studying five selected pedons are presented in this paper. The soils of the studied area are mainly formed on different physiographic units with different ages (alluviall fan, upper teraces and plateaux) and are derived from eroded outcropes of Qom, Upper and Lower red formations. The poor biological activities and low to moderate leaching of lime and gypsum are the main pedological processes which have taken place in the soils of studied area, which resulted in the formation of ochric epipedon on the topsoil and accumulation of lime and gypsum in subsurface horizons. Since the parent material of the soils contain large amounts of lime and gypsum, the subsurface horizons, rich in lime and gypsum, were formed. The depth of these horizons is controlled by solubility products of these components, the age of soils and the degree of profile development. In the study area calcic and gypsic horizons can easily be identified and classified due to their stronge development. Laboratory determinations revealed that the texture of the soils ranges from coarse loamy to sandy. A reverse relationship was found between CEC, gypsum and lime. Except for soils in which montmorillonite is dominant the CEC of the studied soils, like other soils in arid and semiarid climates, is low. This is because the presences of hormite clay minerals, that have low CEC values, are common in soils. These fibrous clay minerals were probably formed as a result of pedogenic processes. Due to limitation of laboratory methods, the amount of some important parameters of the soil, such as, CEC, ESP, SAR, EC and soil texture, don't obey the expected trend found in the literature.

 

 

 

 
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