پاسخ درختان مازودار (Quercus infectoria Oliv) به گلازنی در زاگرس شمالی

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگل‌داری، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

2 استادیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

چکیده

پژوهش پیش‌رو با هدف بررسی پاسخ مازودار (Quercus infectoria Oliv)به گلازنی انجام شد. یک توده کمتردست‌خورده (1/4 هکتاری) و یک توده گلازنی‌شده (1/7 هکتاری) در روستای یعقوب‌آباد شهرستان بانه در استان کردستان انتخاب شدند. در هرکدام از توده‌های انتخاب‌شده، پنج قطعه‌نمونه مستطیلی‌شکل به ‌ابعاد 30×20 متر به‌صورت تصادفی برداشت شدند. در داخل قطعات نمونه، برای همه درختان با قطر برابر سینه مساوی و بیشتر از پنج سانتی‌متر، نام گونه ثبت شد و قطر برابر سینه، ارتفاع کل، ارتفاع تنه و دو قطر بزرگ و کوچک تاج اندازه‌گیری شدند. برای بررسی رویش قطری، در هر توده، 18 اصله درخت مازودار با مبدأ رویشی شاخه‌زاد به‌صورت تصادفی به‌عنوان درختان نمونه انتخاب شدند و از هرکدام در ارتفاع 50 سانتی‌متری تنه با استفاده از مته سال‌سنج، یک جفت نمونه رویشی در دو جهت عمود برهم برداشت شد. در نمونه‌های رویشی، رویش جاری سالانه شعاعی اندازه‌گیری شد. رویش قطری نیز محاسبه شد و سپس میانگین رویش قطری در بازه زمانی 1362 تا 1388 برآورد شد و درصد رویش قطری نیز در طبقات قطری هم‌نام تعیین شد. نتایج نشان داد که میانگین نمایه‌های زیست‌سنجی (قطر، ارتفاع کل، ارتفاع تنه، ارتفاع تاج و سطح تاج) درختان مازودار در توده کمتردست‌خورده از توده گلازنی‌شده بیشتر بود و اختلاف بین آنها معنی‌دار بود. میانگین رویش قطری درختان مازودار در توده گلازنی‌شده (08/2 میلی‌متر در سال) از توده کمتردست‌خورده (32/1 میلی‌متر در سال) بیشتر بود و اختلاف رویش در بازه زمانی مورد بررسی و درصد رویش قطری در طبقات قطری معنی‌دار بود.
 

کلیدواژه‌ها


عنوان مقاله [English]

Response of Gall oak (Quercus infectoria Oliv.) to pollarding in northern Zagros

نویسندگان [English]

  • Ayda Rostami Jalilian 1
  • Loghman Ghahramany 2
  • Hedayat Ghazanfari 2
  • Zahed Shakeri 2
1 M.Sc. Forestry, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran
2 Assistant Prof., Department of Forestry, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran.
چکیده [English]

This study aimed to investigate the response of Gall oak (Quercus infectoria Oliv.) to pollarding. Therefore, a less-disturbed stand (1.4 ha) and a pollarded stand (1.7 ha) were selected. Five rectangular plots (20×30 m) were established in each selected stand by random sampling. In each plot, tree species, diameter at breast height (DBH), total height, trunk height and crown diameter for all trees (DBH ≥ 5 cm) were recorded. In addition, 18 tree samples were taken in each studied stands to assess the diameter increment of Gall oak. A pair of increment cores per sample tree was taken 50 cm above ground level, in which annual radial increment was measured and further multiplied by 2 to derive the annual diameter increment. Then, the diameter increment distribution of Gall oak trees in identical diameter classes was determined for the period of 1984-2010. The mean radial increment of two cores extracted from each sample tree was used in the calculations. The results showed that the average diameters, total height, trunk height, crown height and crown area were significantly lower (p < 0.01) in pollarded stands. Moreover, the averagee diameter increment in less disturbed and pollarded stands was estimated 1.32 and 2.08 mm per year, respectively. The results indicated that average diameter increment of Gall oak trees across he identical diameter classes during the studied period was significantly different between the examined stands.
 

کلیدواژه‌ها [English]

  • Biometric index
  • gall oak
  • northern Zagros
  • pollarding

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