بررسی عامل های مؤثر بر ارتفاع بلند کنده درختان و افت حجمی و ریالی ناشی از آن (مطالعه موردی: جنگلهای حوضه آبخیز اسالم)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 هیات علمی دانشگاه گیلان

2 کارشناسی ارشد جنگلداری دانشگاه گیلان

چکیده

ارتفاع کم کنده، نقش بسزایی در افزایش حجم چوب خروجی و افزایش درآمد ناشی از آن به‌دنبال دارد. به‌همین دلیل ارتفاع کنده 254 درخت مقطوعه در جنگل‌های سری یک ناو در  حوضه هفت جنگل‌های شمال به روش تصادفی انتخاب و اندازه‌گیری شد. برای تجزیه و تحلیل اطلاعات، از روش آنالیز واریانس سه‌عاملی با متغیرهای نوع گونه، شیب دامنه و قطر کنده استفاده شد تا اثر آنها بر روی ارتفاع کنده مورد مطالعه قرار گیرد. در مقایسه با ارتفاع ایده‌آل کنده (15 سانتی‌متر)، متوسط ارتفاع کنده درختان موردمطالعه 45/25 سانتی‌متر بود. نتایج نهایی نشان داد که قطر کنده مهم‌ترین عامل تأثیرگذار بر روی ارتفاع آن است و به‌ازای هر درخت مقطوعه، حجم چوبی معادل02691/0 مترمکعب و 47167 ریال در ازای ارتفاع بیش از اندازه کنده از بین می‌رود.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the effective factors on stump height and its consequences on the financial loss of the harvested volume (case study: forests of Asalem watershed, Guilan Province)

نویسندگان [English]

  • Mehrdad Nikooy 1
  • Hamid Amozadeh 2
1 Assistant Professor, Forestry Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran
2 M.Sc. Graduated, Forestry Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran.
چکیده [English]

Tree felling could optimally result in a low height of the left-over stump, which might positively cause an increment in the harvested amount of wood and in turn augment the associated income. To study this issue, a number of 254 felled trees were randomly sampled within the Nav compartment of watershed no. 7 in Asalem, Guilan province. Following the measurement of the stump heights, a survey on a set of the most influential factors on stump height (including tree species, slope gradient and stump diameter) was conducted in a randomized block design. Compared to the heuristically-optimal stump height of 15cm, the mean stump height of felled trees was 25.45cm. Results turned out the stump diameter to be an effective variable on stump height, which can lead to a possible loss of 0.02691 cubic meter in harvested volume as well as 47167 Rials of financial income per tree.
 

کلیدواژه‌ها [English]

  • Stump height
  • loss in harvested wood
  • stump diameter
  • Slope
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