اثر دخالت‌های مدیریتی بر ساختار توده‌های طبیعی (مطالعه موردی: بخش گرازبن جنگل خیرود)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری جنگل‌شناسی، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

2 استاد، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 استادیار، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

4 دانشیار، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

برای مدیریت صحیح جنگل به شاخص‌­هایی نیاز است که بتوانند با صرف کمترین هزینه و زمان اطلاعات کافی را در رابطه با وضعیت ساختار جنگل و تغییرات آن ارایه دهند. در این پژوهش، اثر نشانه­‌گذاری بر ساختار توده­‌های جنگلی در بخش گرازبن جنگل خیرود توسط شاخص­‌های ساختاری مربوط به پراکنش مکانی و پراکنش غیرمکانی مطالعه شد. برای این منظور، 682 گروه ساختاری (اصله درخت) در دو قطعه‌­نمونه مستطیلی شکل از مرز پایین پارسل تا مرز بالای آن بررسی شدند. نتایج نشان داد که در اثر نشانه‌گذاری، تغییرات شاخص­‌های آمیختگی گونه­‌ای، زاویه یکنواخت، چیرگی ابعاد قطر، اختلاف ابعاد، شاخص تفکیک پیلو، شاخص تجمعی کلارک و ایوانز، تعداد در هکتار، رویه زمینی و قطر برابر سینه معنی­‌دار نبود. نتایج آزمون t جفتی برای شاخص­‌های زاویه یکنواخت و غالبیت ابعاد پیش و پس از نشانه­‌گذاری برای هر دو قطعه‌نمونه مورد بررسی از نظر آماری معنی­‌دار نبود، اما برای شاخص­‌های آمیختگی گونه‌­ای و اختلاف ابعاد، مقدار به‌دست‌آمده معنی­‌دار بود. بر اساس نتایج این پژوهش می‌توان نتیجه‌گیری کرد که به علت توانایی شاخص‌­های مورد استفاده در نشان دادن تغییرات ساختار یک توده طی زمان‌های مختلف و همچنین امکان مقایسه آن با توده­‌های دیگر، می­توان از این شاخص‌­ها به‌عنوان ابزاری مناسب برای مدیریت جنگل در نظام همگام با طبیعت استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of management intervention on structure of natural stands (Case Study: Gorazbon District of Kheirud Forest)

نویسندگان [English]

  • Mohsen Javanmiri Pour 1
  • Mohammad Reza Marvi Mohadjer 2
  • Mahmoud Zobeiri 2
  • Vahid Etemad 3
  • Meghdad Jourgholami 4
1 Ph.D. Student Silviculture, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Assistant Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran
4 Associate Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

Appropriate management of forest requires indices that can provide adequate information about forest structure condition and its changes with the least cost and time. In this research, the effect of tree marking on natural stand structure was evaluated in Gorazbon district of Kheirud forest using indices ofspatial and non-spatial distribution. For this purpose, 682 structural groups (trees) were studied from the lower up to the upper boundary of compartment in two rectangular plots. The results showed that the changes of some indices, including mingling, Uniform Angle Index, DBH dominance, DBH differentiation, Pielou segregation, Clark and Evans aggregation, stem per hectare, basal area and diameter at breast height were not significant. Also, the paired t-test results showed non-significant differences for Uniform Angle Index and DBH dominance, whereas the Mingling and DBH differentiation indices showed significant differences, in the two studied sample plot before and after the tree marking. According to the results of this research, one can conclude that the applied indices are able to show the changes in the stand structure over different time studies and they are suitable for comparison of stands. These indices could be useful tools for forest management in close to nature silviculture.

کلیدواژه‌ها [English]

  • Diameter dimentions
  • Pielou index
  • Spatial pattern
  • species mingling index
  • tree marking
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