Impact of Forest Fires on Wood Anatomy, Soil Composition, and Soil Microorganisms of Acacia origena Asfaw (Leguminosae) in Al Souda Mountain, Southwestern Saudi Arabia

Document Type : Original Article


1 Biology Department, College of Science, King Khalid University, Abha, Saudi Arabia

2 Prince Sultan Bin-Abdul-Aziz Center for Environment and Tourism Studies and Researches, King Khalid University, Abha, Saudi Arabia

3 Botany and Microbiology Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt


Acacia origena, a member of the Leguminosae family, thrives in the challenging environmental conditions of southwestern Saudi Arabia and holds significant economic value. However, the recent occurrence of forest fires has posed a considerable threat to this species, prompting a comprehensive exploration of its resilience. This study investigates the impact of forest fires on Acacia origena, a resilient species in southwestern Saudi Arabia, with a focus on wood anatomy, soil chemical characteristics, and associated microorganisms in Al Mofareh Mountain, Alsoudah, southwestern Saudi Arabia. Fifteen samples from burned and unburned areas were analyzed. These samples were sectioned in both transverse and tangential planes to facilitate light microscopy and the analysis of wood anatomy, revealing distinctive coloration and structural changes in burned tissues. Larger-diameter specimens demonstrated greater resilience, accumulating tannins and forming tyloses to insulate damaged areas. Soil analysis indicated post-fire alterations in texture, composition, and nutrient levels. Microbial assessments highlighted varying responses in yeast and total germ colonies, it was increased by 75%. These findings provide valuable insights into the ecological responses of A. origena and soil ecosystems to fire, emphasizing the importance of comprehensive studies to guide conservation and management efforts in fire-affected regions


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