ویژگی‌های کمی تجدیدحیات راش شرقی (Fagus orientalis Lipsky) در داخل روشنه و زیر پناه پوشش تاجی (مطالعه موردی: بخش گرازبن جنگل خیرود نوشهر)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناسی‌ارشد جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه تهران

2 استاد گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه تهران

3 استادیار گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه تهران

4 استادیار، دانشکده فناوری کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی

چکیده

استقرار زادآوری طبیعی به‌عنوان فرآیندی مهم در استمرار حیات توده‌های جنگلی نقش کلیدی دارد. این پژوهش با هدف بررسی کمی استقرار زادآوری‌ راش (Fagus orientalis Lipsky) در داخل روشنه و زیر پناه پوشش تاجی، در جنگل خیرود شهرستان نوشهر انجام شد. پس از جنگل‌گردشی دو پارسل از بخش گرازبن انتخاب و با پیاده کردن شبکه‌ای با ابعاد 50 ×50 متر، نزدیک‌ترین روشنه‌ها و لکه‌های زادآوری  زیر پناه پوشش تاجی در محل تقاطع اضلاع شبکه انتخاب و نوع گونه، فراوانی و ارتفاع نهال‌ها در آنها اندازه‌گیری شد. تجزیه‌و‌تحلیل داده‌ها نشان داد فراوانی و ارتفاع نهال‌های راش در زیر پناه پوشش تاجی بیشتر از فراوانی و ارتفاع آنها در داخل روشنه است و بین فراوانی و ارتفاع نهال راش در زیر پناه پوشش تاجی و داخل روشنه‌ اختلاف معنی‌داری وجود دارد. با توجه به فراوانی و ارتفاع بیشتر نهال‌های راش در زیر پناه پوشش تاجی نسبت به داخل روشنه، می‌توان گفت که کمبود نور در ابتدای رشد گونه راش در زیر پناه پوشش تاجی نسبت به روشنه نه تنها مانعی برای افزایش فراوانی و ارتفاع نهال‌ این گونه محسوب نمی‌شود، بلکه موجب بهبود زادآوری آن ازنظر فراوانی و ارتفاع در زیر پناه پوشش تاجی شده است. نتایج این بررسی نیاز به نور کم گونه راش یعنی سایه‌پسند بودن آن‌ را تأیید کرد و ایجاد روشنه را پس از استقرار نهال‌های راش برای ادامه رشد نهال‌ها و تضمین بقای زادآوری‌ها در مناطقی که زادآوری این گونه در زیر پناه پوشش تاجی به فراوانی و ارتفاع کافی رسیده است، پیشنهاد می‌کند.

کلیدواژه‌ها


عنوان مقاله [English]

Natural regeneration of oriental beech (Fagus orientalis Lipsky) within canopy gaps and under canopy cover, (Case study: Gorazbon, Kheyroud Forest, Nowshahr)

نویسندگان [English]

  • Nasrin Nasiri 1
  • Mohammad Reza Marvie Mohadjer 2
  • Vahid Etemad 3
  • Kiomars Sefidi 4
1 M.Sc. Silviculture and Forest Ecology, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Prof., Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Prof., Faculty of Natural Resources, University of Tehran, Karaj, Iran
4 Assistant Prof., Faculty of Agriculture and Natural Resources Technology, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Establishment of natural regeneration is a crucial process which plays a key role in maintaining the sustainability within the forest stands. This study aimed to investigate the quantitative characteristics of oriental beech regeneration within canopy gaps and under the canopy in Kheyroud forests of Nowshahr in the north of Iran. Two compartments were initially selected, within which a sampling grid featuring 50×50 m distance between plots was established. Regeneration frequency, species and height of seedlings and saplings were measured both within the gaps and under the canopy. Results showed the frequency and mean height of beech regeneration to be higher under canopy layer. Those parameters also significantly differed from those within the gaps. Our findings also show that the reduced light under the canopy is by no means an obstacle to increase the beech regeneration, but it rather contributes to improve the establishment of natural regeneration of beech. This research confirms the previous findings on the shade tolerance of beech and suggests creating canopy gaps in those stands in which beech seedlings are previously stabilized as a mean to support the natural regeneration.

کلیدواژه‌ها [English]

  • Canopy Cover
  • oriental beech
  • Canopy gaps
  • Natural regeneration
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