Soil Color and Investigation of Its Relationship with Soil Age in Taleghan Terraces

Authors

1 Assistant Professor, Science and Research Branch, Islamic Azad University, Tehran

2 Former MSc. Student of Science and Research Branch, Islamic Azad University, Tehran

Abstract

Color is one of the fundamental properties of soils that is strongly correlated with other soil characteristics and can be used for investigating soil and land development and chronosequences. To investigate the relationship between soil age and color in the Taleghan area, after primary studies and provision of geological and topographic maps and specifying terraces' boundaries, a total of 13 control profiles were dug and described on the terraces. Then, soil color was quantified with Helms method. For thermoluminsence, dating we collected samples at night and put them in special bags which were sealed to prevent light exposure. In the laboratory under red light TL, samples were prepared for dating using fine grain method and were analyzed using the combined additive and regenerative method. At the end, physico-chemical tests were conducted on the soil samples. Findings of this study showed that the age of soils may vary from 4,650 years to 100,000 years. Also, the results of this research show that the percentages of organic carbon and clay in some soils increase with the increase in the age of the Taleghan terrace. Starting from the lower part towards the upper part, there was a significant difference (p< 5%) among the various terraces with respect to clay content. The Taleghan terrace has gone through changes in its texture through time with its semi-arid climate and abundant calcium carbonate in the soil profile. Relative increase in clay and organic carbon with increased age, from the lowest terrace towards the highest terrace, had an effect in the reddening of the soil color and increasing in soil color rating. Finally, the results showed that there was a relationship between hue and age with a coefficient of determination of 0.98. The use of other complementary methods such as luminescence, radiocarbon, and radioactive dating seems essential for determining and confirming the age of soils in these terraces. 

Keywords

References

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Iranian Journal of Soil Research
Volume 31, Issue 3
December 2017
Pages 421-452

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