The role of rainfall simulation in determining the type of relationship between runoff production and soil chemical properties (Case study: Kuhe Gach watershed of Izeh city)

Document Type : Original Article

Author

1Assistant Professor, Department of Soil Conservation and Watershed Management Research, Kerman Agricultural and Natural Resource Research Center, Agricultural Research, Education and Extension Organization, Kerman, Iran. Hamzah.4900@yahoo.com

10.48308/esrj.2023.230366.1160

Abstract

In this study, in order to determine the type of relationship between runoff production and soil chemical properties in different land uses of Gachsaran Formation deposits, a part of Kuhe Gach watershed of the Izeh city with an area of 1202 hectares was selected. In this study, the relationship between runoff and soil chemical properties in different land uses of Gachsaran Formation was determined using univariate regression. Then, sampling of runoff production in 6 points with 3 replicates and in different rainfall intensities of 0.75, 1 and 1.25 mm/minute in three uses of the range, residential area and agricultural lands with the help of the rain simulator was done. In addition, the same number of runoff sampling was performed on soil chemical properties such as organic matter, soil salinity, soil acidity and carbonate calcium. SPSS and EXCEL software were used for statistical analysis. The results showed that in total, in Gachsaran Formation and in range, agricultural and residential land uses and in all three intensities of 0.75, 1 and 1.25 mm/min, soil organic matter in six cases had a negative relationship and in three cases showed positive relationship with runoff production. Soil salinity showed a negative relationship in five cases and a positive relationship in four cases, soil acidity showed a negative relationship in six cases and a positive relationship in three cases, and soil carbonate calcium had a negative relationship in eight cases and in one case showed a positive relationship with runoff production.

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