Environmental study of land degradation in Taleghan river basin scale with quantitative approach

Subject Areas : Water and Environment

Parisa Kharrazi ¹ , Jamal Ghoddousi ² , hasan Karimzadegan ³ , masoud Kheirkhah Zarkesh ⁴

1 - Ph.D. student of Environment Management, Islamic Azad University, Sciences and Researches Unit, Tehran, Iran.
2 - Associated professor and faculty member, Department of Agricultural Education and Research, Soil and Water Conservation Center. *(Corresponding Author)
3 - Associated Professor, Department of Environmental Sciences and Engineering, Faculty of Natural Resources, Islamic Azad University, Lahijan.
4 - Associated Professor of Soil Conservation and Watershed Management Research Institute.

Received: 2020-12-14 Accepted : 2021-07-04 Published : 2022-03-21

Keywords: Environmental study, Land Degradation, quantitative model, Iran, Taleghan dam watershed,

Abstract :

Background and Objective: Land degradation or land degradation is an important global challenge and dilemma that ultimately leads to desertification and the expansion of deserts, especially in areas with arid, semi-arid and semi-humid climates. Poverty and lack of food security, combined with the occurrence of severe droughts and other adverse climatic conditions that put excessive pressure on fragile ecosystems and basic natural resources (water, soil and plants), in such areas and causes Deprivation of vital resources becomes. The purpose of this study is to identify the characteristics and criteria of each of the parameters and factors, both natural and man-made, affecting land degradation so that we can plan to manage them in order to preserve and restore environmental resource resources.Material and Methodology: In this research, using periodic remote sensing data, GIS, field observations and measurements and statistical methods are used and a quantitative model is used to estimate the results.Findings: Based on the obtained results, land degradation in Taleghan Dam watershed scale is a function of six factors: land slope, surface geological characteristics (rock units), soil properties, soil erosion facies by water, land protection and land use Among the factors affecting land degradation, the index of protection on the ground with a weight of 0.20 had the greatest impact on land degradation.Discussion and Conclusion: The proposed model can be used nationally as an efficient model in determining the rate (intensity) and extent of land degraded sites accurately to combat and manage the phenomenon.

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