پویایی پوسیدگی خشکه‌دارهای راش و ممرز در یک جنگل آمیخته راش

نوع مقاله : علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگلداری، دانشگاه تهران

2 استاد دانشگاه تهران

3 هیات علمی دانشگاه تهران

4 هیات علمی دانشگاه محقق اردبیلی

چکیده

در دهه‌های اخیر پویایی خشکه‌دارها و زمان پوسیدگی کامل درختان جنگلی باتوجه به نقش آنها در مدیریت اکوسیستم‌های جنگلی و پدیده ترسیب کربن، مورد توجه اکولوژیست‌ها و جنگل‌شناسان قرار گرفته است. این پژوهش با هدف بررسی روند پوسیدگی در خشکه‌دارهای راش و ممرز در جنگل خیرود نوشهر انجام شد. تعداد 72 خشکه‌دار (کنده) راش و ممرز به‌طور تصادفی انتخاب و مورد بررسی قرار گرفتند. اطلاعات مربوط به گونه، قطر، درجه پوسیدگی و شیب منطقه برای هر نمونه ثبت شد. به‌منظور تعیین دانسیته (چگالی) چوب، برش قطاع مکعبی شکل با طول و عرض و ارتفاع پنج سانتی‌متر در دو جهت عمود بر هم از مقطع عرضی هر نمونه برداشت شد. نتایج نشان داد زمان لازم برای پوسیدگی 95% از جرم خشکه‌دار راش و ممرز در طبیعت به‌ترتیب 30 و 16 سال است. مجموع زمان موردنیاز برای پوسیدگی تمام مراحل پوسیدگی براساس چهار درجه پوسیدگی در خشکه‌دار راش و ممرز به‌ترتیب 27 و21 سال محاسبه شد. همچنین مشخص شد که رابطه قوی بین دانسیته و درجه پوسیدگی خشکه‌دارهای راش و ممرز وجود دارد (0/8=2R)، به‌طوری‌که دانسیته چوب با افزایش درجه پوسیدگی خشکه‌دار در هر دو گونه کاهش می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Decay dynamics of oriental beech (Fagus orientalis Lipsky) and hornbeam (Carpinus betulus L.) deadwood in mixed beech stands

نویسندگان [English]

  • Fatemeh Alidadi 1
  • Mohammad Reza Marvie Mohadjer 2
  • Vahid Etemad 3
  • Kiomars Sefidi 4
1 M. Sc. Forestry, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
2 Prof., Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
3 Assistant Prof., Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
4 Assistant Prof., Faculty of Agriculture and Natural Resources Technology, University of ‎Mohaghegh Ardabili, Ardabil, I.R. Iran.‎
چکیده [English]

Due to their significance for carbon sequestration and ecosystem management, information on decay dynamic of deadwood and its total decay time are of great importance to ecologists and forest managers. This study was conducted in Kheirud forest of Nowshahr to study the decay process of beech and hornbeam deadwood. Therefore, 72 beech and hornbeam dead trees were randomly selected. For each sample tree, information on species, diameter, decay classes and slope gradient were recorded. The cubic cut samples with 5 cm length, width and height in two perpendicular aspects were taken from each decaying stump. 30 and 16 years of decaying time were shown to be needed for 95% dry mass of dead beech and hornbeam logs, respectively. In addition, the required periods for passing through all stages of decay for beech and hornbeam dead trees were 27 and 21 years, respectively. A strong relation (R2=0.8) between density and decay stage of dead trees was indicated. Therefore, the density of dead wood was concluded to significantly decline with increased decay stage in both species.

کلیدواژه‌ها [English]

  • Deadwood
  • decay grade
  • decay time
  • oriental beech
  • hornbeam

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