| تعداد نشریات | 282 |
| تعداد نشریات سازمان | 80 |
| تعداد شمارهها | 3,230 |
| تعداد مقالات | 35,785 |
| تعداد مشاهده مقاله | 54,012,640 |
| تعداد دریافت فایل اصل مقاله | 93,170,770 |
بررسی عامل های مؤثر بر ارتفاع بلند کنده درختان و افت حجمی و ریالی ناشی از آن (مطالعه موردی: جنگلهای حوضه آبخیز اسالم) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 14، دوره 22، شماره 1، فروردین 1393، صفحه 133-142 اصل مقاله (234.77 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2013.9063 | ||
| نویسندگان | ||
| مهرداد نیکوی* 1؛ حمید عموزاده2 | ||
| 1هیات علمی دانشگاه گیلان | ||
| 2کارشناسی 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 | ||
| ارتفاع کنده؛ افت چوب؛ قطر کنده؛ شیب | ||
| 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 Nikooy1؛ Hamid Amozadeh2 | ||
| 1Assistant Professor, Forestry Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran | ||
| 2M.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 | ||
| مراجع | ||
|
- Anonymous. 2003. Nav district forest management plan. Shafaroud Company, 256p (In Persian). - Anonymous. 2011. Marketable wood price booklet according to species and diameter classes. Shafaroud Company, 9p (In Persian). - Boston, K. and Dysart, G. 2002. A comparison of felling techniques on stump height and log damage with economic interpretation. Western journal of applied forestry, 15(2): 59-61. - Conway, S. 1976. Logging Practices. Miller Freeman Publication, 416p. - Craig, R. 1982. Raw material quality control. In: Brown, T.D., (Eds.). Quality control in lumber manufacturing. Miller Freeman Publications, San Francisco: 50-60. - Ershadifar, M., Nikooy, M. and Naghdi, R. 2011. Ability assessment of felling crew in directional felling in west forest of Guilan province. Iranian Journal of Forest, 3(2): 169-176 (In Persian). - Hall, R. and Han, H.S. 2004. A comparison of mechanized and manual felled stump heights in north central British Columbia. Western Journal of Applied Forestry, 19p. - Han, H.S. and Renzie, Ch. 2005. Effect of ground slope, stump diameter, and species on stump height for Feller-Buncher and chainsaw felling. Journal of Forest Engineering, 16(2): 73-79. - Murphy, G. and Twaddle, A.A. 1985. Techniques for the assessment and control of log value recovery in the News Land forest harvesting industry, proceeding of the 9th annual meeting of council of forest engineering, Oregon, Oregon State University, 1-16. USA. - Sarikhani, N. 1972. Wood losses rate during felling, extraction and logging in north forest of Iran in different conditions. Iranian Journal of Natural Resources, No 27 (In Persian). - Sarikhani, N. 2001. Forest Exploitation. Tehran University Press, 776p (In Persian). - Shaffer, R.M. and Taumas, R.S. 1992. A comparison of sheared and saw-head felled stump heights on six non-industrial private timber sales in southeastern Virginia. Southern Journal of Applied Forestry, 16(3):140-142. - Vanderberg, M. 2002. Value loss associated with hardwood log damage and degrades occurring during ground-based harvesting operations in central Appalachia. M.Sc. thesis, Davis College of Agriculture, Forestry and Consumer Sciences, West Virginia University, 107p. - Williston, E. 1979. Opportunity areas and leverage points. Proceedings of the electronics workshop, Sawmill and plywood clinic, Portland, Mar. 1979: 14-18. - Zobeiri, M. 2004. Forest Inventory. Tehran University Press, 402p (In Persian). | ||
|
آمار تعداد مشاهده مقاله: 1,807 تعداد دریافت فایل اصل مقاله: 1,064 |
||