Investigating Spatial Variability of the hydraulic characteristics of Sistan plain soils

Articles in Press

Document Type : Research Paper

Authors

1 Members of Scientific Board, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

2 Members of Scientific Board, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO)Karaj, Iran.

3 Researcher, Zabol Agricultural and Natural Resources Research Center, Zabol, Iran.

Abstract

Saturated hydraulic conductivity (Ks) is one of the most important soil physical characteristics that plays a major role in the soil hydrological behaviour. In this study, 312 surface (0-30 cm) soil samples were taken and their hydraulic characteristics were measured. Also, soil texture and bulk density was measured in 2080 surface soil samples. The results showed that the soil texture of the area varied from sandy to clay and Most of the soils in the region had medium texture. The average bulk density of the region was 1.43 gr.cm-3. the average field capacity in all the cities of Dasht Sistan is less than 35%, which are in the class of low field capacity. The highest and lowest amount of available water was also observed in Hirmand and Zabul respectively. The coefficient of change of available water in all surface soils of Sistan Plain lands is 33.83% and it is in the range of very high variability. According to the average values of saturated hydraulic conductivity, the lowest and highest values of saturated hydraulic conductivity (Ks) of the surface soil were in Zabul (0.15 m per day) and Hirmand (0.42 m per day) respectively.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 20 October 2024

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