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Assessment of Vegetation Cover Changes and its Relationship with Temperature and Precipitation (Case Study: Urmia Lake Basin)

Document Type : Original Article

Authors
Ahmad Mazidi 1
Hamideh Dehghan 2
Hajar Toofani Kopai 2
1 Associate Professor of Climatology and Faculty Member, Department of Geography, Yazd University, Yazd, Iran
2 PhD student in Climatology, Yazd University, Yazd, Iran
10.30467/nivar.2025.504638.1322
Abstract
Vegetation cover is an essential factor in the structure and function of terrestrial ecosystems and one of the fundamental links in the vital water-soil-plant-atmosphere chain. This research was conducted to investigate vegetation cover changes and the factors affecting it in the Urmia Lake Basin. In this regard, precipitation images from the CHRIPS database and LST and NDVI images from the MODIS sensor were used during a 23-year statistical period (2001-2023). The results of the seasonal rainfall rate show that rainfall in this basin has a decreasing trend from the periphery of the basin towards the center of the basin. The highest rainfall in this basin is related to the winter season in 2018 and 2019, and the lowest rainfall is related to the summer season in 2003. The land surface temperature has increased due to changes in the vegetation cover of the Urmia Lake Basin. It was also found that most seasons during this period had a temperature between 20 and 40 degrees Celsius, which covered an area of about 25 to 35 thousand square kilometers. The study of vegetation cover in the Urmia Lake Basin showed that the largest area of vegetation cover occurs in the spring season, which has a decreasing trend (R2 = -0.151), and the smallest area of vegetation cover occurs in the winter season with a decreasing trend (R2 = -0.44). The results of the correlation between rainfall and vegetation cover showed that there is a positive and significant correlation in the winter and autumn seasons, and a positive and non-significant correlation in the spring and summer seasons at the 0.05 confidence level. The correlation between temperature and vegetation cover showed that there is a positive correlation and a strong and significant relationship in the winter season at the 0.01 confidence level.
Keywords
Land Surface Temperature
Vegetation Cover
Urmia Lake Basin
MODIS Sensor
Subjects
 
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Nivar
Volume 49, 130-131 - Serial Number 130
October 2025
Pages 177-194

  • Receive Date 04 February 2025
  • Revise Date 22 June 2025
  • Accept Date 12 July 2025
  • Publish Date 23 September 2025