ارتباط روشنه‌های تاج‌پوشش ناشی از اجرای شیوه تک‌گزینی با ضخامت لایه هوموس در جنگل راش (مطالعه موردی: راشستان الندان ساری

نوع مقاله: علمی- پژوهشی

نویسنده

استادیار، گروه جنگل‌داری، دانشکده کشاورزی، دانشگاه لرستان

چکیده

پژوهش پیش‌رو به نقش روشنه‌های تاج‌پوشش ناشی از اجرای شیوه تک‌گزینی بر میزان ضخامت لایه هوموس در توده جنگلی راش پرداخته است. شانزده روشنه در طبقات کوچک، متوسط، بزرگ و خیلی بزرگ با چهار تکرار برای هر طبقه در راشستان سری الندان ساری، استان مازندران انتخاب شدند. اندازه‌گیری لایه هوموس در مرکز و چهار جهت اصلی روشنه‌ها و نمونه‌برداری برای برخی آزمایش‌های شیمیایی به‌روش نمونه‌های ترکیبی انجام شد. نتایج نشان داد که روشنه‌های تاج‌پوشش ازنظر ضخامت لایه هوموس اختلاف معنی‌داری داشتند. ضرایب همبستگی اسپیرمن نشان داد که با افزایش ضخامت لایه هوموس،  مقدار ازت کل (درصد)، فسفر و کربن آلی (درصد) کاهش یافت. ضخامت لایه هوموس در مرکز روشنه‌ها کمتر از حاشیه روشنه‌ها بود و بیشترین میانگین ضخامت لایه هوموس در جهت شمال جغرافیایی مشاهده شد. به‌طور کلی، نتایج پژوهش نشان داد که روشنه‌های ناشی از اجرای عملیات بهره‌برداری بعد از هشت سال بر عمق لایه هوموس در جنگل راش مؤثر بودند که به‌نوبه خود بیان‌گر اهمیت و نقش روشنه‌ها در بوم‌سازگان جنگل است.
 
 
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Interactions between canopy gaps created by single-tree selection method and humus layer thickness (Case study: Alandan forest, Sari, Mazandaran province)

نویسنده [English]

  • Kambiz Abrari Vajari
Assistant Prof., Department of Forestry, Faculty of Agriculture, Lorestan University
چکیده [English]

This research investigated the effect of canopy gaps created by single-tree selection method on humus layer depth within a managed oriental beech (Fagus orientalis Lipsky) stand in Hyrcanian region. To accomplish this, 16 gaps were selected in 4 classes (small, medium, large and very large) with 4 replications for each sample in a beech stand in Alandan district, Sari (Mazandaran province). Humus layer depth was measured in center and cardinal points of the gaps. In addition, humus was sampled based on composite samples for chemical experiments. The results showed a significant difference of humus thickness among gaps. The correlation coefficients indicated that the total N, P, K, organic carbon and C/N ratio were decreased with increasing humus depth. Humus layer depth in gap center was lower than that in the edge of gap, and the highest humus thickness was observed in the northern geographical aspect. In general, the result of study revealed that canopy gaps created by single-tree selection method affect the humus layer depth after 8 years, which in turn indicates the important role of gaps within forest ecosystems.

کلیدواژه‌ها [English]

  • beech
  • canopy gap
  • Hyrcanian Forest
  • soil
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