Hazard assessment of livestock pressure in Khuzestan province, Iran

Document Type: Full Article

Authors

Department of Natural Resources and Environmental Engineering, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- Overgrazing accelerates soil and vegetation degradation in rangelands. This study aimed to assess livestock pressure on natural resources of Khuzestan province, located in the south western part of Iran, using Geographic Information System (GIS) tools and a model-based procedure. FAO/UNEP Model which uses a ratio of potential carrying capacity of region to current livestock population density as an Index for livestock pressure was selected for this purpose. However, the model was modified in this study to achieve a better estimation of pressure index according to the actual conditions of the region. Parameters used to modify this methodology were: Topographic and Local parameters. Local parameters were annual consumption for livestock unit in the study area, dependency of each livestock to pasture, number of livestock unit for each animal and land use map. Hazard map of pressure of livestock was prepared after overlying and calculating different parameters in a GIS. According to the results, hazard classes of severe and very severe included about 70% of natural resources in the study area. Areas including higher classes of hazard severity were identified in the west, center and south east part of the region, mostly. This is because of low potential of natural rangeland to grow enough forage and also a high number of livestock

Keywords


Article Title [Persian]

ارزیابی خطر فشار دام در استان خوزستان، ایران

Authors [Persian]

  • مریم الهایی سحر
  • مسعود مسعودی
گروه مهندسی منابع طبیعی و محیط زیست، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران.
Abstract [Persian]

چکیده- چرای بیش از حد، تخریب خاک و پوشش گیاهی در مراتع را افزایش می دهد. در این مطالعه ارزیابی فشار دام در منابع طبیعی استان خوزستان، که در جنوب غربی ایران واقع شده است با استفاده از سیستم اطلاعات جغرافیایی (GIS)  و یک مدل انجام شد. بدین منظور از مدل فائو-یونپ که بر اساس نسبت ظرفیت برد بالقوه منطقه به تراکم فعلی جمعیت دام ، فشار دام را بررسی می نماید استفاده شد. با این حال، به منظور دستیابی به ارزیابی بهتر فشار دام با توجه به شرایط واقعی منطقه اصلاحاتی روی این مدل صورت گرفت. پارامترهایی که برای اصلاح روش استفاده شد عبارتند از: پارامترهای توپوگرافی و محلی. پارامترهای محلی شامل مصرف سالانه واحد دامی در منطقه مورد مطالعه، وابستگی هر دام به مرتع، تعداد واحد دامی برای هر حیوان و نقشه کاربری اراضی بودند. نقشه خطر فشار دام پس از همپوشانی و محاسبه پارامترهای مختلف درGIS  تهیه شد. با توجه به نتایج، کلاس خطر شدید و بسیار شدید حدود 70 درصد از منابع طبیعی در منطقه مورد مطالعه را شامل می شود. طبقات با شدت خطر بالا بیشتر در مناطق غرب، مرکز تا جنوب شرق منطقه مورد مطالعه مشاهده شد. این مسئله به دلیل پتانسیل کم مراتع طبیعی در رشد کافی علوفه و همچنین وجود تعداد زیادی از دام در این مناطق می باشد.

Keywords [Persian]

  • واژه های کلیدی:
  • فشار دام
  • واحد دامی
  • منابع طبیعی
  • FAO/UNEP
  • GIS
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