Journal of Arid Regions Geographic Studies

Journal of Arid Regions Geographic Studies

Investigating the effects of land use changes on vegetation (Case study: Mian-Ab watershed in the period 2000-2020)

Document Type : Original Article

Authors
1 Assistant Professor, Department of Physical Geography, Faculty of Geographical and Planning, Isfahan University, Isfahan, Iran
2 Department of Natural Geography, Faculty of Geographical Sciences and Planning, Isfahan University, Isfahan, Iran
Abstract
Aim: The amim od this research is to investigate the effects of land use changes on vegetation in Mian-ab watershed  in Shushtar city  from 2000 to 2020.
Material & Method: In this research, Landsat 5 and 8 satellite images for 2000 and 2020, respectively, were downloaded from the United States Geological Survey (USGS) website. After extracting the images, necessary pre-processing, including atmospheric, radiometric, and geometric corrections, was done on them in the Envi-5.3 software environment. To prepare the land use map, supervised classification algorithms, including maximum likelihood, minimum distance from the mean, parallel surfaces, and Mahalanoi distance, were used.
Finding:  The results show, in the period of 2020, changes in agricultural indicators (46.1%), range land (1.14%), water areas (1.54%), and a decreasing trend in rainfed lands (1.94%) and residential areas (3.63%) have an increasing trend compared to 2000. Dams, industrial centers, polluting factories, and temperature increases have caused most areas of good condition of vegetation indicators to become average.
Conclusion: Based on the research findings, residential areas are rarely observed where the basin has a steep and slippery slope (15-30%) since leveling operations are not carried out in them. The natural situation and fluctuations in the height of the Shushtar watershed have produced a variety of plants.
Innovation: The results of the conversion of agricultural and barren lands and lands that are already part of the river bed were applied, and the percentage of changes in the area of the index (SAVI) was lower than other indices, which is why the soil surface moisture of this index is affected by crop irrigation.
Keywords

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  • Receive Date 16 July 2023
  • Revise Date 08 September 2023
  • Accept Date 17 September 2023
  • Publish Date 01 May 2024