نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، اداره کل منابع طبیعی ایلام، ایران

2 گروه علوم جنگل، دانشکده کشاورزی، دانشگاه ایلام

چکیده

استان ایلام یکی از رویشگاه‌های طبیعی گونه گلابی وحشی (Pyrus syriaca Boiss) در ایران است. برداشت میوه، چرای بی‌رویه عرصه‌های جنگلی، تخریب جنگل‌ها و توسعه کشاورزی در سال‌های اخیر موجودیت این گونه را به خطر انداخته است. در این بررسی رویشگاه عمده گونه گلابی وحشی در استان ایلام، واقع در منطقه جنگلی زردلان در شمال شرقی شهرستان شیروان چرداول مورد مطالعه قرار گرفته است. پس از مشخص کردن محدوده مورد مطالعه در روی نقشه 1:50000 و با استفاده از پارامترهای مورد نظر، نقشه‌های شیب، جهت و ارتفاع تهیه و پس از تلفیق آنها، واحدهای کاری معین گردید. در هر واحد کاری با در نظر گرفتن مساحت آن، حداقل سه قطعه نمونه تصادفی تعیین و خصوصیات این نقاط (شیب، جهت، ارتفاع از سطح دریا، طول وعرض جغرافیایی) ثبت و به پیاده کردن پلاتهای 10 آری دایره‌ای شکل اقدام و کلیه پارامترهای کمی و کیفی گلابی وحشی در آنها اندازه‌گیری و ثبت شد. نتایج نشان داد که گلابی وحشی در شیب های 15 تا 30 درصد دارای بیشترین ارتفاع و قطر برابر سینه است. در جهت های شمالی بهترین شرایط از لحاظ سلامت تاج، تقارن تاج و کیفیت تنه گلابی وحشی مشاهده شده است. یافته‌های تحقیق همچنین نشان داد که بهترین کیفیت تنه در ارتفاعات میانی (1500 تا 1750 متر) وجود دارد، اما ارتباط معنی داری بین ارتفاع از سطح دریا با سایر متغیرهای کمی و کیفی گلابی وحشی دیده نشد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of environmental factors affecting the characteristics of pyrus syriaca Boiss in Zarddalan forest, Ilam

نویسندگان [English]

  • Hojatollah Fathi 1
  • Jaafar Hosseinzadeh 2

1 Master of Forestry, Department of Natural Resources and Watershed, Ilam, Iran

2 Department of Forest Sciences, Faculty of Agriculture, University of Ilam, Iran

چکیده [English]

Ilam province is one of the natural habitats of wild pear (Pyrus syriaca Boiss) in Iran. Fruit harvesting, inappropriate grazing forest areas, deforestation and agricultural development in recent years has endangered the existence of the species. In this study, the major habitats of the species in Ilam province, which located in the forest area of Zardalan in the north eastern city of Chardavol in Ilam province, is studied. After specifying the study area on the map 1:50000, using desired parameters, the maps of slope, aspect and elevation were prepared and then by combined together, work units were determined. In each unit, according to its area, at least three random circular sample plots with area of 1000 m2 randomly settled and environmental characteristics such as slope, aspect, elevation, geographical longitude and latitude were determined. Then all the qualitative and quantitative parameters of wild pear were measured and recorded in the plots. The results showed that wild pear in intermediate slopes (15 to 30 percent) have the highest height and diameter at breast height. It was observed that, in point of health crown, crown shape and trunk quality, north aspects for wild pear are the best conditions. The findings also showed that the best trunk quality is at altitude between (1500 to 1750m), but no significant correlation between altitude and other qualitative and quantitative variables of wild pear was found.

کلیدواژه‌ها [English]

  • Pyrus syriaca
  • Zardalan
  • Ilam
  • Environmental Factors
  • Zagros
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