بررسی الگوی مکانی بنه با استفاده از زاویه بین درختان در جنگل‌های جوانرود کرمانشاه

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری جنگلداری

2 استادیار دانشگاه رازی کرمانشاه

3 استادیار دانشگاه کردستان

چکیده

الگوی مکانی یکی از ویژگی‌های کلیدی اکوسیستم‌های جنگلی است که به‌همراه ترکیب و ساختار، عملکرد و خودتنظیمی جنگل را کنترل می‌کند. با توجه به ‌اهمیت اقتصادی و زیست‌محیطی گونه بنه و نقش الگوی مکانی درختان در مدیریت جنگل، در این تحقیق الگوی مکانی بنه مورد بررسی قرار گرفت. در این پژوهش که در قسمتی از جنگل‌های جوانرود در استان کرمانشاه انجام شد، از اندازه‌گیری زاویه بین درختان برای تعیین الگوی مکانی استفاده شد. بدین‌منظور، عرصه‌ای به‌مساحت 50 هکتار انتخاب و 50 نقطه نمونه‌برداری در طرح نمونه‌برداری تصادفی- منظم در قالب شبکه آماربرداری 100×100 متر برداشت و در هر نقطه زاویه‌های موردنیاز برای محاسبه شاخص‌های (Winkelmass) Wi و (Mean of Angle) MoA برداشت شد. نتایج نشان داد که الگوی بنه در این تحقیق به‌شکل کپه‌ای متمایل به تصادفی است و شاخص MoA نیز از دقت لازم برای تعیین الگوی مکانی گونه بنه برخوردار نیست.

کلیدواژه‌ها

عنوان مقاله [English]

An investigation of spatial pattern in Pistacia atlantica Desf. stands by angular method in Javanroud region of Kermanshah

نویسندگان [English]

  • Amir Safari 1
  • Reza Hossein Heidari 2
  • Naghi Shabanian 3
  • Mahsa Karimi 1
1 Ph.D. Student of Forestry, Department of Forestry, Tarbiat Modares University, Noor, I.R.
2 Assistant Prof., Campus of Agriculture and Natural Resources, Razi University, Kermanshah, I.R. Iran.
3 Assistant Prof., Department of Forestry, Faculty of Natural Resources, University of Kurdistan, Sanandaj, I.R. Iran.
چکیده [English]

In addition to composition and structure, the spatial pattern also plays a key role in forest ecosystems. These three attributes act in constellation by regulating ecosystem functioning and resilience. Regarding the socio-economic importance of Pistachio species, information on the spatial pattern of these trees can be considered as a criterion for management in semi-arid areas of Iran. In this study, the spatial pattern of wild Pistachio (Pistacia atlantica Desf.) was studied. Therefore, a 50-ha areas in Javanroud region was sampled in regular 100×100 m grids with 50 sample plots in a systematic random sampling design. In each sample, angles required for calculating Winkelmass (Wi) and Mean of Angle (MoA) indices were measured. The results showed clumpy pattern of the trees which also tended to random. In addition, the MoA index was shown to be insufficiently inaccurate for estimating the spatial pattern of P. atlantica across the study area. 

کلیدواژه‌ها [English]

  • Spatial pattern
  • Pistacia atlantica
  • Wi index
  • MoA index
  • Javanroud

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