تحلیل ساختار جنگل‌های زاگرس با استفاده از شاخص‌های مبتنی بر نزدیک‌ترین همسایه (پژوهش موردی: جنگل‌های قلعه‌گل خرم‌آباد)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگلداری

2 استادیار دانشگاه لرستان

3 کارشناس ارشد جنگلداری

چکیده

بررسی ساختار جنگل برای درک بسیاری از مسائل در اکولوژی و مدیریت جنگل ضروریست. در این تحقیق با استفاده از آماربرداری صددرصد محدودهای بهوسعت 32 هکتار در منطقه پرک قلعهگل استان لرستان، ساختار گونههای موجود با استفاده از مجموعهای از شاخصها موردبررسی قرار گرفت. برای بررسی ساختار از شاخصهای کلارک و اوانز، زاویه یکنواخت، شانون- وینر، آمیختگی، اندازه مساحت تاجپوشش و اختلاف مساحت تاجپوشش استفاده شد. شاخصهای مذکور به بررسی تنوع موقعیت مکانی، تنوع گونهای و تنوع ابعاد درختان میپردازند. براساس نتایج بهدستآمده، میانگین شاخصهای کلارک و اوانز و زاویه یکنواخت بهترتیب 0/80 و 0/47 محاسبه شد که نشاندهنده توزیع کپهای است. میانگین شاخصهای شانون- وینر و آمیختگی نیز بهترتیب 0/25 و 0/06 محاسبه شد. با توجه بهاینکه سهم قابلتوجهی از منطقه موردمطالعه از گونه بلوط ایرانی تشکیل شده است، ارزش شاخص آمیختگی کم محاسبه شد. مقدار میانگین شاخص اندازه مساحت تاجپوشش 0/50 محاسبه شد که نشاندهنده غالببودن ابعاد تاج گونههای بلوط ایرانی، کیکم، زالزالک و گلابی و مغلوببودن گونههای شن و ارژن است. همچنین مقدار شاخص اختلاف مساحت تاجپوشش که به کمیسازی اختلافات موجود بین درختان مجاور یکدیگر از نظر سطح تاجپوشش میپردازد، برای کل درختان موجود در منطقه 0/48 محاسبه شد که نشاندهنده اختلاف آشکار بین درختان از نظر سطح تاجپوشش است. نتایج پژوهش پیشرو نشان داد که جنگل منطقه پرک استان لرستان از نظر تنوع زیستی در وضعیت نگرانکننده و نامناسبی قرار دارد و باید با برنامهریزی مناسب از این روند کاهشی تنوع زیستی که طی سالیان اخیر شدت گرفته است، جلوگیری کرد. البته این جنگل از نظر موقعیت مکانی و تنوع ابعاد درختان هنوز در وضعیت مناسبی قرار دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis of Zagros forest structure using neighborhood-based indices (Case study: Ghalehgol forest, Khorramabad)

نویسندگان [English]

  • Peiman Farhadi 1
  • Javad Soosani 2
  • Kamran Adeli 2
  • Vahid Alijani 3
1 M.Sc. Student, Department of Forestry, Lorestan University, Khorramabad, I.R. Iran.
2 Assistant Prof., Department of Forestry, Lorestan University, Khorramabad, I.R. Iran
3 M.Sc. Forestry, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran.
چکیده [English]

Analysis of forest structure is essential for enhanced understanding of forest ecology and management. In this study, the spatial structure of the existing species in Perk district of Ghaleh Gol site in Lorestan Province was explored. To this end, a 32-hectare region was 100% surveyed. To investigate the spatial structure, we used a set of indices including the Clark and Evans, uniform angles, Shannon-Wiener, mingling, Crown canopy and Crown canopy differentiation indices. The results showed the average values of 0.8 and 0.47 for Clark and Evans and uniform angles indices, respectively. This indicated random and cluster distribution patterns. In addition, Mean values of 0.25 and 0.06 were returned by Shannon - Weiner and mingling indices. Due to the dominant Oak coverage within the study area, Blend Low Index was additionally calculated. The mean Crown Canopy Index of 0.5 turned out a canopy dominance of Quercus  brantii, Acer cineracense, Crataegus sp. and Pyrus syriaca  over Lonicera nomularifolia and Amygdalus sp.. Moreover, the Crown Canopy Differentiation Index was calculated to quantify the differences between the levels of crown canopy in adjacent trees. This returned a mean value of 0.48 for the entire trees, which reflects the difference between the tree canopy levels. The results showed that the study site is currently undergoing an inappropriate biodiversity for woody species which yet shows better conditions compared to similarly-structured stands in the region. As a conclusion, proper forest planning measures should be carried out to prevent the recently experienced consistent loss of biodiversity. 

کلیدواژه‌ها [English]

  • Forest structure
  • spatial diversity
  • species diversity
  • dimensional diversity
  • Perk forest of Ghale Gol
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