HAZARD ASSESSMENT OF DESERTIFICATION USING MEDALUS
MODEL IN MAZAYJAN PLAIN, FARS PROVINCE, IRAN
Masoud Masoudi and R. Zakeri Nejad
Abstract
This paper presents the MEDALUS approach, a quantitative assessment of desertification, in the case study
area located in the Southern part of Iran. Four main factors or indicators of desertification including: soil,
climate, plant cover, and management were considered for evaluation. Then several sub-indicators affecting
the quality of each main indicator were quantified according to its quality and given a weighting of
between 1.0 and 2.0. ArcView software was used to analyze and prepare the layers of quality maps using
the geometric mean to integrate the individual sub-indicator maps. After that the final desertification
hazard map was prepared by overlaying different main indicator (quality) maps in the GIS and the final
hazard classes were defined on the basis of hazard scores arrived at by the geometric mean of the main
indicators. Results show that the areas under critical hazard are the most extensive class in the desertification
map. In other words, most of the study area is sensitive to desertification. Results also showed that the
climate and plant cover qualities and then management quality are the most important indica-tors affecting
desertification process. This undesirable state has been caused by arid climate and also poor conditions
of rangelands. Also the human activities play an important role in accelerating desert-ification
process.
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