نشریه علمی - پژوهشی مرتع و آبخیزداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموختۀ کارشناسی ارشد بیابان‌زدایی، دانشگاه زابل، ایران.

2 دانشجوی کارشناسی ارشد مدیریت مناطق بیابانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، ایران.

3 دانشجوی دکتری بیابان‌زدایی، پردیس کشاورزی و منابع‌طبیعی، دانشگاه تهران، ایران.

4 هیأت علمی گروه احیاء مناطق خشک و کوهستانی، دانشکده منابع طبیعی، دانشگاه تهران، ایران.

چکیده

مناطق خشک و نیمه‌خشک سطح وسیعی از کشور را به خود اختصاص داده­اند. منطقۀ روداب سبزوار به‌عنوان نمونه‌ای بارز از مناطق بیابانی کشور می‌باشد که تحت تأثیر خطر بیابانزایی قرار گرفته است. هدف این مطالعه ارزیابی خطر بیابانزایی با استفاده از مدل ESAs و تهیه نقشۀ ریسک بیابانزایی می‌باشد. بر پایه این روش در ابتدا نقشۀ واحدهای کاری در منطقه به عنوان نقشۀ پایه برای ارزش‌دهی شاخص‌های مورد نظر تهیه شد. سپس شاخص‌های مورد بررسی بر اساس مدل ESAs و با استفاده از سامانۀ اطلاعات جغرافیایی تهیه شد و در نهایت شاخص ESAI برای هر واحدکاری محاسبه و پهنه‌بندی شد. نتایج نشان داد که منطقۀ روداب از نظر خطر بیابانزایی، در سه کلاس I، II و III قرار گرفته است که بیشترین سطح منطقه را زیرکلاس III1 با پوشش 48/44 درصد از سطح منطقه به خود اختصاص داده است. نقشۀ خسارت بیابانزایی منطقه روداب در پنج کلاس قرار گرفت به طوری که کلاس III با 20/35 درصد بیشترین سطح منطقه را پوشش داد. رخساره پهنه‌های ماسه‌ای فعال علاوه بر دارا بودن بالاترین خطر بیابانزایی، به دلیل برخورداری از عناصر در معرض خطر قابل توجه، بیشترین ریسک بیابانزایی را نیز به خود اختصاص داد که با توجه به خسارت شدید، انتظار می‌رود در اولویت برنامه‌های بیابانزدایی قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Assessment and Mapping Desertification Risk in Roudab Region

نویسندگان [English]

  • Fatemeh Azariyan 1
  • Sara Valizadeh 2
  • Pouyan Dehghan 3
  • Hassan Khosravi 4

1

2

3

4

چکیده [English]

Iran is mostly consisted of arid and semi-arid areas. Rudab region, Sabzevar, is indicative of an area
exposed to and affected by the risk of desertification. This study accordingly is aimed at assessing
the risk of desertification using ESAs model, through mapping the risk of desertification. Initially,
work units’ map was prepared based on which relevant indicators were valued. Then, relevant
indices were prepared based on ESAs model using GIS. Finally, ESAI index was calculated for
each work unit. After mapping the risk of desertification, desertification damages were evaluated. It
was found out that the risk of desertification in Rudab can be classified at three classes i.e. class I,
II, and III; and subclass III1 covered the biggest surface of the study area i.e. 44.48%. Based on
desertification damage map, Rudab region is divided into five classes so that class III covering
35.20 percent of the area is the biggest area. Active sandy dune faces are prone to the highest risk of
desertification since they entail significant risk factors and need to be paid due attention for desert
greening programs.

کلیدواژه‌ها [English]

  • Desertification Risk
  • ESAs Model
  • Desertification Damage
  • Roudab region
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