بررسی تغییرات مکانی و پهنه‎بندی آلودگی جنگل به گونه نیمه‎انگلی موخور (Loranthus europaeus) در جنگل‌های زاگرس (مطالعه موردی: ایلام)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، گروه جنگل‌داری، تهران، ایران

2 استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، گروه جنگل‌داری، تهران، ایران

3 دانشیار پژوهش، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، تهران، ایران

چکیده

یکی از عوامل تهدید‎کننده جنگل‌های زاگرس وجود گونه ‎نیمه‎انگلی موخور (Loranthus europaeus) است که پهنه‎بندی و بررسی تغییرات مکانی آن به‌منظور مدیریت آن در این عرصه مهم است. بدین‎منظور منطقه حفاظت شده کوه منجل به دلیل حضور چشم‎گیر موخور با شدت‎های متفاوت و عدم انجام پاک‎سازی با مساحت 37 هکتار، در استان ایلام انتخاب و مختصات تمامی گونه‎های موجود به همراه نوع گونه و شدت آلودگی و سایر مشخصات در 27 ترانسکت 320 متری ثبت گردید. در مجموع مشخصات 541 پایه درختی و درختچه‎ای بررسی گردید. نتایج حاصل از نمونه‎برداری حکایت از آلودگی 78 درصدی منطقه جنگلی به گونه موخور داشت. نتایج بررسی ساختار مکانی گسترش موخور با استفاده از روش واریوگرافی در زمین آمار حکایت از وجود ساختار مکانی قوی (89%) بوده و بدین معناست که در منطقه مورد مطالعه نحوه پراکنش موخور وابسته به مکان و دارای کانون آلودگی است. شعاع کانون آلودگی در این بررسی 206 متر تعیین شد. به‌منظور پهنه‎بندی گسترش موخور در منطقه مورد مطالعه از روش‎های کریجینگ و IDW (وزن‎دهی بر اساس عکس فاصله) استفاده شد. با توجه به پایین بودن مقدار خطای میانگین هر دو روش، نتیجه گرفته شد که روش ترانسکت به‌منظور نمونه‌برداری با فاصله‎ 137 متر (دو سوم دامنه تأثیر 206 متری به‌منظور اطمینان بیشتر) و روش کریجینگ به دلیل دقت مناسب و قابل قبول و تعیین فاصله‎ کانون آلودگی در عرصه‎های مشابه واقع در رویشگاه زاگرس می‎تواند با صرف زمان و هزینه کمتر در کنترل و پایش این تهدید مفید باشد. 

کلیدواژه‌ها


عنوان مقاله [English]

Spatial variation and dispersion pattern of European yellow mistletoe (Loranthus europaeus) affected forests in Zagros area, a case study of Ilam forests

نویسندگان [English]

  • Bahareh Sohrabi Saraj 1
  • Hadi Kiadaliri 2
  • Reza Akhavan 3
  • Sasan Babae Kafaki 2
چکیده [English]

    Yellow mistletoe (Loranthus europaeus) species is a semi-parasitic plant presently threatening Zagros forests. Spatial variation and dispersion pattern of this semi-parasitic plant is important for its control and management in this area. For this purpose, a 37 ha forest patch forests was selected in Ilam province and 541 individual trees in 27 transects of 320m were examined for plant species and yellow mistletoe severity and abundance. To investigate spatial variation and mapping of forest infection, variogram analysis and Kriging and IDW interpolation methods were applied. Results showed that 78% of individual trees were infected by yellow mistletoe and its distribution had strong spatial structure (89%) and a hotspot by 206 m range of influence. Both IDW and Kriging showed acceptable variance error for mapping. Kriging method is considered to be a valid method for interpolation and mapping of yellow mistletoe affected areas. Appropriate distance for transect sampling was estimated as 137 m based on variogram analysis.  

کلیدواژه‌ها [English]

  • Interpolation
  • Kriging
  • IDW
  • Yellow Mistletoe
  • Zagros region
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