تعیین ضریب شکل راش (Fagus orientalis Lipsky) در جنگل‌های استان گلستان

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگل‌داری، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 استادیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 دانشیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

4 کارشناس ارشد اداره کل منابع طبیعی و آبخیزداری استان گلستان، گرگان، ایران

چکیده

­راش (Fagus orientalis Lipsky) یکی از ارزشمندترین گونه‌­های تجاری جنگل‌های هیرکانی است که 17/6 درصد سطح و 30 درصد حجم سرپای این جنگل­ها را تشکیل می­دهد. پژوهش پیش‌رو با هدف تعیین و به‌روز کردن ضریب شکل درختان راش در استان گلستان و اصلاح جدول حجم این گونه انجام شد. پس از جنگل‌گردشی، مطابق با لیست نشانه­­‌گذاری سال 1394-1393 اداره کل منابع طبیعی و آبخیزداری استان گلستان، ­150 اصله راش در طبقات قطری مختلف (30 تا 135 سانتی‌متر) در محدوده پنج طرح جنگل‌داری لیوان، وطنا، کردکوی، شموشک و دکتر بهرام‌نیا به روش تصادفی انتخاب شدند. از هر درخت اطلاعات قطر برابر سینه (سانتی‌­متر)، قطر در 0/1، 0/3، 0/5، 0/7 و 0/9 ارتفاع درخت و قطر ابتدا و انتهای قطعات 2 متری تا قطر ­7/5 سانتی‌متری اندازه‌گیری و حجم دقیق و ضریب شکل­‌های واقعی، مصنوعی، طبیعی و هوهنادل برای کلیه درختان محاسبه شدند. نتایج نشان داد که ضریب شکل راش با استفاده از فرمول­‌های هوهنادل، طبیعی، مصنوعی و واقعی به‌‌ترتیب 0/502، 0/464، 0/407 و 0/454 بود. از نظر آماری تفاوت معنی­‌داری در سطح اطمینان 95 درصد بین ضریب شکل واقعی، مصنوعی و طبیعی با هوهنادل وجود داشت، اما بین ضریب شکل طبیعی و واقعی تفاوت معنی‌­داری وجود نداشت. همچنین، بین حجم واقعی و حجم به‌دست‌آمده از جدول تاریف در سطح اطمینان 95 درصد تفاوت معنی‌­داری وجود داشت و بیشترین تفاوت بین حجم واقعی و حجم به‌دست‌آمده از جدول تاریف در طبقات قطری بالا بود. با توجه به نتایج این پژوهش، می‌توان نتیجه­‌گیری کرد که برای تعیین ضریب شکل راش، ضریب شکل طبیعی می‌تواند مورد استفاده قرار گیرد. 

کلیدواژه‌ها

عنوان مقاله [English]

Determination of form factor for oriental beech (Fagus orientalis Lipsky) in Golestan province

نویسندگان [English]

  • Mohammad Reza Kordi 1
  • Jahangir Mohammadi 2
  • Mohammad Hadi Moayyeri 3
  • Jahanbakhsh Sadeghian 4
1 M.Sc. Student, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Assistant Prof., Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 Associate Prof., Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
4 M.Sc. Forestry, General Office of Golestan Natural Resources and Watershed Management, Gorgan, Iran
چکیده [English]

Oriental beech (Fagus orientalis Lipsky) is one of the most valuable tree species that covers 17.6% of the area and make up 30% of the stand volume in the Hyrcanian forests. This study aimed to update the form factor and to improve the volume table of this species. For this purpose, we applied random sampling method to collect field data from 150 beech trees in different diameter at breast height (D.B.H) classes (30-135 cm) based on inventory and marking list of 2015-2016. The sample trees were distributed in five forest management plan area including Livan, Vatana, Kordkuy, Shamushak, and Dr. Bahramnia. In each tree, D.B.H and diameter at 0.1, 0.3, 0.5, 0.7 and 0.9 of tree height, as well as diameter at two tops of 2 m long logs were measured. Finally the tree volume, true, natural, artificial and Hohnadl form factor for each tree was computed. The results showed that true, natural, artificial, and Hohnadl form factor value were 0.503, 0.464, 0.407 and 0.454, respectively. There were significant statistical differences between the true, artificial and natural with Hohnadl form factor (α = 0.05). The difference between true and natural form factor was not significant. Also, the results showed that there was significant difference between the computed volume and the volume driven from volume table (tariff); the greatest differences between the mentioned volumes estimated was mainly in the large D.B.H classes. According to the results, we can conclude that the natural form factor can be applied to determine the beech form factor.

کلیدواژه‌ها [English]

  • Artificial form factor
  • Hohnadl form factor
  • natural form factor
  • tariff
  • true form factor
  • true volume

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