Organic Matter Quality and Clay Mineral Type of Soils on a Catena in Deilaman Region of Guilan Province

Document Type : Research Paper

Authors

Abstract

This research is conducted to evaluate the quality of organic matter and clay type in the soils
which are located at different positions of the slope of a catena in Deilaman region of Guilan
province. To do this, the catena was firstly divided into five transverse sections including summit,
shoulder, back slope, foot slope and toe slope. Then each section was longitudinally divided into
three parts as three replications and composite soil samples were collected from each sections at the
depths of 0-20, 20-40 and 40-60cm and some characteristics of soils and clay minerals of the
samples were determined. Results showed that the maximum organic matter and carbohydrate
contents were found in the soils located on the lower positions of the catena (representing foot slope
and toe slope). Carbon-nitrogen ratio decreased by reducing the slope, indicating the more decay of
organic matter in the positions of foot slope and toe slope. Soil microbial respiration amounts also
more increased with reducing of the slope. Clay mineralogy of soils located on the catena confirmed
the presence of kaolinite, illite, hydroxy interlayer vermiculite and little amounts of chlorite in the
soils. The type of clay minerals was the same but their frequency was varied at the different slope
positions and soil depths. The results of present study revealed that soil properties were affected by
topography in this region.

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References

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Water and Soil Science
Volume 26, 1-2
June 2016
Pages 161-172

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