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Abstract


Rates of Soil Development of Yeşihrmak and Kelkit River Terrace Soils in Kazova and Tokat Basins
The objective of this study was to determine the rates of soil development in Yeşilırmak and Kelkit river terraces. The rates of soil development was determined by using a soil development index, combining eight soil properties, and designed by Harden (1982). Of the eight properties used by index, the clay films have not been used to calculate soil development index and also was not detected in both areas. In this study applied to the two chronosequence in Kazova and Niksar basin, the rates of soil development increased with time. However, this rate was eneough to form a B horizon. In both areas, the development of soil properties was increased or decreased lineerly, logaritmically or exponentially functions. Since the soils are very young the soil development occured approximately at 50 cm below the surface. But, the soil development of the buried soil profiles was greater than surface soil. Although, both areas have the same climate, vejetation, parent material and topography, the rates of soil development in Yeşihrmak terrace soils was found to be higher than that in Kelkit terrace soils. The soil development rates in the study areas were affected by the soil properties such as level of ground water, organic matter content and amount of clay more than the factors of soil formation.

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