CHRONOSEQUENCE STUDY OF SOILS IN SEFIDRUD RIVER TERRACES IN GILAN PROVINCE, IRAN

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TORABI H.; KARIMIAN EGHBAL M.

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Journal: Iranian Journal of Soil Research Year:2002 | Volume:16 | Issue:1 Page(s): 0-0

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Title

CHRONOSEQUENCE STUDY OF SOILS IN SEFIDRUD RIVER TERRACES IN GILAN PROVINCE, IRAN

Author(s)

TORABI H. | KARIMIAN EGHBAL M. | Issue Writer Certificate

Keywords

CHRONOSEQUENCEQ4

GILANQ3

FREE IRON OXIDESQ4

TERRACE SOILQ3

SEFIDRUD RIVERQ4

Abstract

Few studies have been done on soils of GILAN province in northern Iran, although the area enjoys high potential for agricultural production and has vast forested regions. To study the effect of time on the formation of soils in the area, physical, chemical and micromorphological properties of four soils on flood plain and three upper terraces of SEFIDRUD RIVER was investigated in this study. Different size fraction of sand, silt and clay were separated by centrifuge. Lithologic discontinuity was determined by performing similarity index test on different horizons, using eight size fractions of sand and silt. Crystalline, amorphous, and organic iron was extracted using CBD, ammonium oxalate and sodium pyrophosphate respectively. The increase in difference between oxalate extracted and CBD extracted iron (Fed-Feo) from lower flood plain to highest TERRACE SOILs indicates increase in crystalinity of iron and also soil profile development. At the same time, the ratio of (Feo/Fed) decreases toward the upper TERRACE SOIL that is also indication of increase in soil development and relative soil age. Other factors such as organic matter and CEC increase and pH and base saturation decrease toward the upper TERRACE SOIL. As a result of increase in relative soil age and decrease in soil pH from soils of flood plain to middle (T2) and upper terraces. Chlorite is transformed to smectite, hydroxy interlayer smectite and other mixed minerals. In the middle terrace (T2) soil, chlorite is completely disappeared but the relative amount of smectite is increased. Three different methods were tested to remove hydroxy interlayers from 2:1 clays, but only one of these methods which consisted of washing coarse clay fraction by 0.05 M HCl, heating to 400oC and finally boiling it in 0.5 M NaOH was able to remove hydroxy interlayers. The results showed this mineral is primarily hydroxy interlayer smectite (HIS). The presence of lithologic discontinuity in the middle and the upper terraces, which was shown by similarity index test, indicates that contrary to previous beliefs, these soils are formed on alluvial rather than eolian deposits.

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استفاده از اندکس تشابه در تعیین درجه همگنی مواد اولیه خاک

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APA: Copy

TORABI, H., & KARIMIAN EGHBAL, M.. (2002). CHRONOSEQUENCE STUDY OF SOILS IN SEFIDRUD RIVER TERRACES IN GILAN PROVINCE, IRAN. IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES, 16(1), 0-0. SID. https://sid.ir/paper/357204/en

Vancouver: Copy

TORABI H., KARIMIAN EGHBAL M.. CHRONOSEQUENCE STUDY OF SOILS IN SEFIDRUD RIVER TERRACES IN GILAN PROVINCE, IRAN. IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES[Internet]. 2002;16(1):0-0. Available from: https://sid.ir/paper/357204/en

IEEE: Copy

H. TORABI, and M. KARIMIAN EGHBAL, “CHRONOSEQUENCE STUDY OF SOILS IN SEFIDRUD RIVER TERRACES IN GILAN PROVINCE, IRAN,” IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES, vol. 16, no. 1, pp. 0–0, 2002, [Online]. Available: https://sid.ir/paper/357204/en

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