Soil Genesis and Classification of Available Soils Along a Toposequence in Farsarood Region of Darab City, Fars Province

Document Type : Research Paper


1 M. Sc. Student, Soil Science Department, Faculty of Agriculture University of Shiraz, Shiraz. Iran

2 Prof., Soil Science Department, Faculty of Agriculture University of Shiraz, Shiraz. Iran

3 Assistant Prof., Soil Science Department, Faculty of Agriculture University of Shiraz, Shiraz. Iran


Surveying of soils along a toposequence is a primary key for identification of the spatial variability and development of soils that have been performed continuously at a certain direction. The main objective of this study is to assess both clay mineralogy and Sorensen similarity index to describe the genesis and development of soils in Fasarood region. In this context, three major physiographical units were recognized in this area (i.e., Colluvial fan, Piedmont plain and Flood plain). Moreover, nine presentative pedons were digged according to physiographical map units in the direction of NW to SE. Typic Endoaquepts and Oxyaquic Haplustepts are identified as dominant soils in the flood plain in which the redoximorphic and gleyzation processes have been occurred. Fluventic Haplustepts and Typic Calciustepts were recognized in the piedmont plain along with an irregular decrease in organic-carbon content as well as calcic horizon, caused by erosion and sedimentation, respectively. Typic Ustorthents is the major soil of Colluvial fan that have more than 60% coarse fragment in subsurface horizon. The results revealed that smectite, illite, cholorite, palygorskite and kaolinite were dominating minerals in colluvial fan, piedmont plain and flood plain. According to the similarity index, 0.5, 0.54, 0.55, 0.74 and 0.74 were achieved for order, suborder, great group, sub group, and family levels, respectively. Generally, similarity index could better describe soil variation in different slope position than clay mineralogy due to its quantity approach.


Main Subjects

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