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Investigation and Prediction of Vegetation Cover Variations in the Geomorphic Units of the Northern Desert Zone of Isfahan Province
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Jafar Ganjali *   , Amirhossein Halabian2 , Amir Karam3 , Shila Hajehforoshnia4 |
Department of Geography, Payame Noor University, Tehran, Iran, Department of Geography, Payame Noor University, Tehran, Iran , j_ganjali@pnu.ac.ir
2- Department of Geography, Payame Noor University, Tehran, Iran
3- Physical Geography Department, Kharazmi University, Tehran
4- Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization, Tehran, Iran |
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Abstract: (79 Views) |
The analysis of vegetation cover variations serves as a key index for identifying the heterogeneity of landforms and biodiversity and determining important areas to protect this fundamental environmental component. This research examines the changes in vegetation cover within the landforms of the northern desert zone of Isfahan Province using Landsat 5 and 8 digital data (TM and OLI-TIRS sensors) spanning 1987 to 2020. During this timeframe, 200 images were acquired over 27 warm months from June 1st to August 31st annually. Initially, the necessary preprocessing was applied to the study area images. After landform classification using the Topographic Position Index (TPI), vegetation cover changes in these landforms were examined. The findings revealed that the highest Enhanced Vegetation Index (EVI) values were associated with prominent landforms, mountains, and highlands, in contrast, the lowest values were observed in flat terrains (playas, mud, and clay pans). Changes in EVI at varying elevations indicated a noticeable decrease in EVI values at an altitude of 1400 m (the middle pediments). Concurrently, EVI values in mountainous regions (elevations exceeding 1400 m) displayed a significant increase. The EVI index on slopes steeper than 65° exhibits a marked decline due to the presence of rocky and steep terrain. Spatial patterns of the EVI index for the year 2030 suggest that the Karkas Mountains, particularly from Mount Karkas to Mount Marshan and the areas between Kashan and Ardistan, will encounter severe and harsh environmental conditions.
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Article number: 2 |
| Keywords: Enhanced Vegetation Index (EVI), Topographic position index (TPI), Physiographic factors, Landform, Landsat images |
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Full-Text [PDF 2059 kb]
(16 Downloads)
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Type of Study: Applicable |
Subject:
Special
Received: 2023/11/28 | Accepted: 2024/11/11 | Published: 2025/04/22
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