برآورد توان بیابان‌زایی استان یزد با بهره‌گیری از شاخص‌های dvi

بیابان زایی یکی از چالش های مهم در بسیاری از کشورهای دنیا است و این پدیده بعنوان تهدیدی جدی برای بسیاری از مناطق از جمله مناطق خشک و نیمه خشک محسوب می شود. با توجه به اهمیت موضوع، پژوهش حاضر به شناسایی مناطق آسیب پذیر استان یزد در برابر بیابان زایی با استفاده از شاخص dvi پرداخته است. در پژوهش حاضر از اطلاعات کتابخانه ای، بررسی های آماری مربوط به جمعیت استان یزد، داده های اقلیمی استان یزد و مدل رقومی ارتفاعی srtm 30m استفاده شده است. مهم ترین نرم افزارهای مورد استفاده، نرم افزار arcgis و spss بودند که بر پایۀ شاخص آسیب پذیری dvi به کاربرده شدند. در شاخص dvi از 9 معیار در قالب چهار گروه: جمعیتی، آب و هوایی، توپوگرافی و خاکشناسی بهره گیری می شود. همچنین بر خلاف پژوهش های پیشین، از مدل anp نیز به منظور وزن دهی به شاخص ها استفاده شده است. نتایج حاصله از پژوهش نشان داده است که حدود 84% از وسعت استان یزد دارای توان آسیب پذیری زیاد و خیلی زیادی است که عمدتا شامل مناطق شمالی و مرکزی استان یزد است. همچنین بر اساس نتایج حاصله، در بین شهرستان های استان یزد، شهرستان های خاتم و بهاباد دارای کم ترین درصد آسیب پذیری و شهرستان های یزد، میبد و اردکان دارای بیشترین پتانسیل آسیب پذیری هستند. مجموع نتایج حاصله از این پژوهش نشان داده است که بخش های زیادی از استان یزد از جمله مناطق شمالی و مرکزی آن دارای پتانسیل آسیب پذیری زیادی هستند که نیازمند توجه ویژه و اجرای برنامه های بلندمدت برای جلوگیری از آسیب پذیری و افزایش بیابان زایی است.

analysis of desertification potential of yazd province using dvi indicators

introduction one of the environmental challenges in the world is desertification. desertification is land degradation in arid, semi-arid and dry sub-humid caused by several factors such as climate change and human activities. desertification is a significant phenomenon, particularly in arid and semiarid regions. in many instances, it is seen as a serious threat to human societies. the desertification process in developing countries is very intense, and this issue can have a significant impact on the future of these countries. iran is a country that is exposed to the phenomenon of desertification. due to the geographical location, arid and semi-arid areas cover approximately two-thirds of iran. the desertification phenomenon is present in yazd province. due to its climate and hydrogeomorphology, this province, which is located in the central regions of iran, has a high vulnerability potential against land use changes and desertification. considering the importance of the topic, this research has identified the vulnerable areas of yazd province against desertification using the dvi index. material and methods in this research, library information, statistical data related to the population of yazd province, climatic data of yazd province, as well as the 30-meter srtm dem as the most important research data were used. the model used in this research was based on dvi vulnerability index. the dvi vulnerability index was the basis for the model used in this research. the time-spatial changes of vulnerability to desertification in the banas river basin in india have been investigated using the dvi model. the dvi model uses 9 indicators, which are grouped into 4 groups: demographic indicators, weather indicators, topographic indicators, and soil indicators. results and discussion in this research, in order to identify the vulnerable areas of yazd province to desertification from demographic indicators (population density, population growth and illiteracy percentage), weather indicators (precipitation rate, average temperature, and evaporation rate and dryness index), topographic indices (slope percentage) and soil science indices (soil type) have been used. the slope index indicates that the western parts of yazd province are more vulnerable. according to the geological index, the northern and eastern parts of this province are highly vulnerable. the northern, central, and eastern regions of yazd province are highly vulnerable in terms of precipitation, average temperature, evaporation, and dryness indicators. yazd city has a high vulnerability potential in terms of population density index. in terms of population growth index, ardakan city has a high vulnerability potential and also in terms of illiteracy index, taft city has a high vulnerability potential. the location of yazd province has resulted in a large portion of its area being covered in arid and hyper-arid areas. due to their high vulnerability to erosion, destruction, and vulnerability, many parts of this province are prone to desertification. the dvi model was used to evaluate the vulnerability potential of yazd province against desertification in this research. the dvi model results are divided into 4 vulnerability potential classes: low, medium, high, and very high. the results indicate that the class with a high vulnerability potential covers 42.9% of the area, which is primarily concentrated in the northern and central areas of yazd province. the class with high vulnerability potential covers 41/4 of the area, which primarily encompasses the western regions of yazd province. the classes with medium and low vulnerability potential are distributed in the central, southeastern, and southern parts of yazd province, with 14.3 and 1.4 percent of the area, respectively. the vulnerability status of cities in yazd province has been assessed in this research. khatam and bahabad cities have the lowest vulnerability percentage, while yazd,