Spatiotemporal Analysis of the Impact of Dust Storms on Thermal Stress and the Health of Oak Forests in Ilam Province Using Remote Sensing Data

Document Type : Original Article

Authors

1 PhD Student in Climatology at Kharazmi University,

2 Professor in the Department of Physical Geography, Kharazmi University,

3 Professor in the Department of Physical Geography, Kharazmi University

10.30740/cccd.2025.737334
Abstract
Dust storms are among the most significant environmental hazards in western Iran, exerting considerable impacts on natural ecosystems, particularly the Zagros oak forests. This study aims to investigate the spatiotemporal variations of dust and analyze its effects on the vegetation condition of oak forests in Ilam Province during the period 2005–2020. For this purpose, Aerosol Optical Depth (AOD) was used as an indicator of dust intensity, while the Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) were applied to assess vegetation status and thermal conditions, respectively. MODIS satellite data and Sentinel‑2 imagery were processed within the Google Earth Engine platform. Temporal trends of dust were analyzed using the non‑parametric Kendall’s Tau test, and spatial correlation analysis between AOD and vegetation indices was conducted in the ArcGIS environment.The results indicated that AOD values exhibited interannual variability and increasing trends during certain periods. Spatial correlation between AOD and VCI was negative and statistically significant across large parts of the oak forests, particularly in the southern and southwestern areas of the province, indicating a decline in vegetation condition concurrent with increased dust levels. Moreover, the correlation between AOD and TCI revealed intensified thermal stress under high dust concentrations. The sensitivity map showed that southern areas were most affected, while northern highlands experienced the lowest impact.

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