ارزیابی الگوی پراکنش پایه‌های خشکیده بلوط ایرانی (Quercus brantii Lindl.) در جنگل‌های منطقه تل‌گاه یاسوج

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد جنگل‌داری، دانشکده کشاورزی، دانشگاه یاسوج

2 استادیار، گروه جنگل‌داری، دانشکده کشاورزی، دانشگاه یاسوج

3 دانشجوی دکتری جنگل‌داری، دانشکده منابع طبیعی و علوم زمین، دانشگاه شهرکرد

چکیده

در پژوهش پیش‌رو یک توده جنگلی به وسعت حدود 25 هکتار در منطقه تل‌گاه در نزدیکی شهر یاسوج برای ارزیابی الگوی پراکنش مکانی درختان خشکیده بلوط ایرانی (Quercus brantii Lindl) بررسی شد. برای جمع‌آوری اطلاعات کمی و کیفی، از روش‌های قطعه‌نمونه با مساحت ثابت و روش نمونه‌برداری خوشه‌ای انطباقی استفاده شد. مشخصات کمی کلیه درختان بلوط خشکیده موجود در منطقه مورد مطالعه با استفاده از 65 قطعه‌نمونه 10 آری به‌همراه مشخصات سایر درختان سالم موجود در قطعات نمونه، آماربرداری شد، به‌نحوی‌که هر درخت خشکیده احتمالی در هر قطعه‌نمونه، خود مرکز قطعه‌نمونه دیگری بود. علاوه‌بر مختصات جغرافیایی درختان خشکیده، قطر برابر سینه، ارتفاع کل و قطر تاج درختان در هر قطعه‌نمونه اندازه‌گیری شد. برای کمی کردن الگوی پراکنش درختان خشکیده از شاخص‌های جانسون- زیمر، ابرهارت و پیلو که براساس فاصله نقطه نمونه‌برداری تا فرد (درخت) استوار هستند و از شاخص‌های نسبت واریانس به میانگین، موری‌سیتا و استانداردشده موری‌سیتا که برمبنای به‌کارگیری قطعات نمونه هستند، استفاده شد. تمام شاخص‌های مربوط به قطعه‌نمونه، الگوی کپه‌ای را برای درختان خشکیده نشان دادند. از میان شاخص‌های فاصله‌ای، شاخص جانسون- زیمر و ابرهارت الگوی کپه‌ای و شاخص پیلو الگوی یکنواخت را نشان دادند.

کلیدواژه‌ها

عنوان مقاله [English]

Distribution pattern of declined Brant`s oak (Quercus brantii Lindl.) trees in forests of Tol-e Ghah, Yasuj

نویسندگان [English]

  • Ehsan Taghvayipour 1
  • Alireza Salehi 2
  • Yousef Askari 3
1 M.Sc. Student, Department of Forestry, Faculty of Agriculture, University of Yasuj
2 Assistant Prof., Department of Forestry, Faculty of Agriculture, University of Yasuj
3 Ph.D. Student, Department of Forest Science, Faculty of Natural Resources and Earth Science, University of Shahrekord
چکیده [English]

A forest stand of 25 ha in Tol-e Gah region nearby Yasuj (Kohgiluyeh and Boyer Ahmad province) was selected to assess the spatial distribution pattern of its dead trees of Brant`s oak (Quercus brantii Lindl). The fixed area plot samples and adaptive cluster sampling method were employed to collect qualitative and quantitative information of the forest stand. Using sixty-five, 10-Ar sample plots, quantitative characteristics of all dead trunks together with those for the healthy trees in the sample plots were recorded in a way that each dead trunk found in each of the plots was considered as the center of another sample plot. In addition to determining the geographical coordinates of the dead trunks, diameter at breast height, tree height, and crown diameter of trees were measured. The Johnson-Zimmer, Eberhart, and Pielou indices (based on the distance of the sampling spot to the individual trees) and the variance to mean ratio, Morisita index, and standardized Morisita indices (efficient in using plot samples) were applied to quantify the distribution pattern of dead trees. All sample plot-related indices indicated a clumping distribution pattern for the dead trees. Among the distance indices, the Johnson-Zimmer and Eberhart indices also showed a clumping and a uniform pattern of dead tree distribution, respectively.

کلیدواژه‌ها [English]

  • Distribution pattern
  • oak decline
  • distance indices
  • sample plot indices

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