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ارزیابی بلندمدت التیام زخم در درختان صدمه دیده در اثر عملیات چوبکشی (مطالعه موردی: جنگل خیرود) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 3، دوره 25، شماره 4 - شماره پیاپی 70، دی 1396، صفحه 553-562 اصل مقاله (563.79 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2017.113854 | ||
| نویسندگان | ||
| نیلوفر نوریزدان1؛ مقداد جورغلامی* 2؛ باریس مجنونیان3 | ||
| 1کارشناسی ارشد مهندسی جنگل، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 2دانشیار، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 3استاد، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| چکیده | ||
| امروزه با توجه به اعمال شیوه جنگلشناسی نزدیک به طبیعت برای مدیریت جنگلهای هیرکانی و پراکندگی برداشت در این شیوه، کاهش صدمات به توده باقیمانده اهمیت زیادی پیدا کرده است. هدف از این پژوهش، بررسی و مقایسه بلندمدت مقاومت گونهها و قطرهای مختلف درختان در مقابل زخمهای ایجاد شده با اندازه، شدت و محلهای متفاوت و چگونگی تغییرات در محل زخم (التیام و بسته شدن زخم) بود. این پژوهش در بخش پاتم و نمخانه جنگل خیرود با اندازهگیری صدمه به درختان باقیمانده در فاصله پنج متر از دو طرف محور مرکز مسیرهای چوبکشی بهصورت پیمایش زمینی و آماربرداری صددرصد از درختان صدمه دیده انجام شد. نتایج نشان داد که بین نوع گونه و مقدار التیام اختلاف معنیداری وجود داشت و راش مقاومترین گونه در مقابل صدمه مکانیکی بود. با افزایش قطر و با افزایش اندازه زخم (مساحت اولیه زخم)، نسبت التیام بهطور معنیداری کاهش مییافت. با افزایش ارتفاع محل زخم، درصد التیام زخم تغییر معنیداری نداشت و با افزایش شدت زخم، درصد التیام بهطور معنیداری کاهش مییافت. همچنین، سن زخم اثر معنیداری بر نسبت التیام زخم و موقعیت درختان در مسیر چوبکشی تأثیر معنیداری بر مقدار صدمات به درختان باقیمانده داشت. با توجه به این نکته که بیشتر زخمها در ارتفاع تا یک متری درخت ایجاد میشوند و این قسمت از درخت با ارزشترین قسمت چوب است، بنابراین تلاش برای کاهش آثار صدمات به توده باقیمانده هنگام عملیات چوبکشی زمینی ضروری است. | ||
| کلیدواژهها | ||
| اندازه زخم؛ بهرهبرداری جنگل؛ پاتم؛ سن زخم؛ مسیر چوبکشی؛ نمخانه | ||
| عنوان مقاله [English] | ||
| Long-term evaluation of scar closure on residual damaged trees following ground-based skidding (Case study: Kheyrud forest) | ||
| نویسندگان [English] | ||
| Niloufar Nouryazdan1؛ Meghdad Jourgholami2؛ Baris Majnounian3 | ||
| 1M.Sc. Forest Engineering, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Associate Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 3Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| چکیده [English] | ||
| Now a day, due to applying the close to nature forestry method to manage the Hyrcanian forests and harvest distribution in this method, reducing damage to the residual stand gains more important. The aim of this study was to determine and compare the resistance of the various diameters of tree species against scars or created during logging operation considering to the size, intensity and different locations as well as to study the change in the wound (healing and wound closure) in the species over time. The research was carried out in the Patom and Namkhaneh district in the Kheyrud Forest. The results showed that there were significant differences among scar healing in the tree species. By increasing the diameter of the trees, the healing rate was significantly reduced, while by increasing the size of the wound (the primary area of the wound), scar healing rate was significantly decreased. Also, by increasing the scar height along the bole, the rate of wound healing has been changed significantly. By the increasing severity of the wound, healing rate was significantly reduced. The results showed that scar age has significant effect on the healing rate, but traffic intensity hasn’t significant effect on wound healing rate. Tree position along the skid trail has positive effects on the amount of residual damage trees. Due to the fact that wounds are made in one meter height of the trunk, which is the most valuable part of the tree, trying to control the damage of trees is essential in the ground skidding operations. | ||
| کلیدواژهها [English] | ||
| Forest harvesting, Kheyrud forest, scar age, scar size, skid trail | ||
| مراجع | ||
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