Investigating land use changes and their effects on soil erosion :Case study Namin County

Document Type : Original Article

Authors

1 PhD in Geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

2 professor of Geomorphology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Iran.

3 Professor of Climatology, Department of physical Geography, Faculty of Social Sciences, University of Mohaghegh Ardabili

Abstract

The aim of the present study is to investigate the changes in different land uses and evaluate the effects of land use changes on soil erosion in Namin County. In order to achieve the goals of this study, first a land use map was prepared using the object-oriented method for the two periods of 2002 and 2024. In the next stage, information layers of other effective factors for soil erosion of the city were prepared in the GIS environment. The evaluation and standardization of the layers were carried out using the fuzzy membership function and weighting of the criteria, using the CRITIC method. The final analysis and modeling was carried out using the ARAS multi-criteria algorithm. The results of this study showed that the largest area in 2002 was related to poor pastures and rainfed agriculture, with 493.71 and 209.91 square kilometers, respectively, and in 2024, it was related to poor pastures and rainfed pastures with 422.62 and 271.93 square kilometers, respectively. According to the 2002 erosion zoning map, 15.05 and 22.46 percent, respectively, and according to the 2024 erosion zoning, 15.92 and 25.04 percent of the county's area are in the two very high-risk and high-risk categories, respectively. In general, the presence of erodible soil, the occurrence of heavy rainfall, and the intervention of human factors through land use change, destruction of vegetation, excessive grazing, road construction, plowing on slopes, and improper irrigation can be considered as the major factors of soil erosion and reduced fertility in Namin City.

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Main Subjects

References

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History

  • Receive Date: 18 December 2024
  • Revise Date: 12 March 2025
  • Accept Date: 15 March 2025

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