Relation between Soil Evolution and Landforms Diversity in Dasht-E-Tabriz

For maintenance of soil fertility and increasing of soil utilization in sustainable agriculture, the information from soil characteristics is necessary. In this research work, effects of landforms on soil morphological and physico-chemical characteristics in Dasht-E-Tabriz were studied and soils were classified. Five profiles in landforms of hill, piedmont, river alluvial plain, playa and lowland were dug and soil moisture and temperature regimes were determined. From hill to lowland, increasing trend of clay, OC, CEC content and depth of soil solum with decreasing of gravel percentage with changing of textural classes showed more development of downstream soils than upstream ones by soil forming processes. This confirmed morphological results, that hill with colorful marn and sandstone parent material and thin solum took place in Entisol order and other landforms with alluvial parent material and thick solum were classified in Aridisol order. Finally, Soils according to Keys to Soil Taxonomy (2014) were classified in Aridisol and Entisol orders, suborder of Calcids, Argids, Salids and Orthent, with great groups of Haplocalcids, Natrargids, Haplosalids and Torriorthentand subgroups of Xeric Haplocalcids, Xeric Natrargids, Typic Haplosalids and Xeric Torriorthent.