ارزیابی کارایی روش‌‌های بدون قاب در برآورد ساختار مکانی توده‌‌‌های بلوط اوری (Quercus macranthera) در جنگل‌های ارسباران‌

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشگاه محقق اردبیلی

2 استادیار، گروه علوم و صنایع چوب و کاغذ، دانشکدۀ فناوری کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل

3 دانشگاه ارومیه

4 اداره کل منابع طبیعی استان آذربایجان شرقی

چکیده

این پژوهش برای بررسی روش‌های نمونه‌برداری بدون قاب در برآورد ساختار و الگوی پراکنش مکانی رویشگاه‌های بلوط سیاه (macranthera Quercus)‌ انجام شد. نمونه‌برداری زمینی به روش فاصله‌ای به‌عنوان یکی از روش‌های نمونه‌برداری بدون قاب در نه قطعه‌نمونه به مساحت یک هکتار و 81 نقطه به روش منظم تصادفی انجام شد. تراکم، سطح رویه زمینی، تاج­پوشش درختان و شاخص‌های الگوی پراکنش مکانی محاسبه شدند. نتایج شاخص‌های‌ پراکنش الگوی مکانی ‌هاپکینز الگوی کپه‌ای و ابرهارت و جانسون-زایمر الگوی پراکنش یکنواخت را برای گونه مورد بررسی نشان دادند. شاخص‌های ساختار توده نشان دادند که مقدار شاخص‌های فاصله تا همسایه 45/4، تمایز ارتفاعی 28/0، تمایز قطری 17/0 بود و آمیختگی گونه‌ای برابر با 73/0 و نشان از آمیختگی بالای گونه بلوط سیاه با گونه‌های همراه در منطقه مورد بررسی داشت. مقدار متوسط شاخص زاویه یکنواخت نیز 52/0 به­دست آمد. ویژگی‌های تراکم، سطح رویه زمینی و تاج­پوشش حاصل از روش نمونه‌برداری دارای اختلاف معنی­دار با مقادیر واقعی حاصل از آماربرداری 100 درصد بود.

کلیدواژه‌ها


عنوان مقاله [English]

Efficiency evaluation of the plotless method methods for estimating the spatial structure of Persian oak (Quercus macranthera) stands in Arasbaran forests

نویسندگان [English]

  • Milad Safari 1
  • Kiuomars Sefidi 2
  • Ahmad Alijanpour 3
  • Mohammad Razi Elahian 4
1 University of Mohaghegh Ardabili
2 Assistant professor, Department of Wood and Paper Science and Technology, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardebili, Ardebil, I.R. Iran.
3 University of Urmia
4 Azarbayjan Province Department of Natural Resources
چکیده [English]

This study was conducted to investigate the non-framed sampling methods for estimating the structure and spatial distribution pattern in Persian oak (Quercus macranthera) stands. Field sampling with distance method as a non-framed sampling methods was done in nine plots, each with one hectare, and totally by 81 points using systematic random network. Density, basal area, canopy of trees and spatial distribution pattern were calculated. According to the results, the Hopkins spatial pattern distribution indices were calculated. The results of Clump distribution, Eberhart and Johnson-Zimmer indices showed uniform distribution pattern for the species. In addition, structural indices showed that the value of the indices of distance to neighbor was 4.45, height difference was 0.28, diameter difference was 0.17, and the species interspecific index was 0.73 which indicate high composition of Q. macranthera with other accompanying species in the studied area. Also, the average value of the uniform angle index was 0.52. Density, basal area, canopy of trees resulted by sampling method had significant differenc with real amount that resulted from 100% inventory.

کلیدواژه‌ها [English]

  • Quercus macranthera
  • Arasbaran forest
  • Structural diversity
  • Eberhart index
  • Distance sampling
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