Comparison Between Keys to Soil Taxonomy and WRB to Classification of Soils in Segzi Plain (Iran)

Aridic soil moisture regime, occupy the largest area in central of Iran. Objective of this research was compare between Keys to Soil Taxonomy and WRB in classification of soils in Segzi plain. Segzi plain is located in the Eastern of Isfahan province in center of Iran. In order to do this research, 5 profiles as a vertical transect were studied. Soil colors were defined using a Munsell soil color charts. Soil pH, electrical conductivity, Gypsum percent, carbonate calcium and organic matter were measured. Several samples have got from some of Profiles for Micromorphological analysis. Frequently classification of soils in Segzi plain in Keys to Soil Taxonomy is Gypsic Aquisalids and in WRB is Hypersalic Solonchaks (Sodic). This research has also shown that both of classification system can rather reasonable classify this zone but both of them are defect in soil classification of natural resources.